{"abstract":"The integrator degrades to low order and orbits drift.","category":"Orbital propagation","checks":7,"contract":"Input [r0, v0, mu, T, steps] for a planar two-body orbit. Integrate state [x,y,vx,vy] with acceleration -mu r/|r|^3 using classical RK4 with h=T/steps for exactly steps steps. Return the final state rounded to 6 decimals.","contract_signature":"x","evaluation_group":"w2-orbital_propagation-rk4_two_body","failed_approach":"A quarter-step probe is equally inconsistent with the RK4 weights.","family":"w2-orbital_propagation-rk4_two_body-midpoint-stage","id":"FA-69521","implementations":{"attempt":{"sha256":"7baa722f5d9575443a5693de0f2428ed61eddcb101b6161c0772f9a5da1ac68d","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    r0,v0,mu,T,steps=x\n    h=T/steps\n    def f(s):\n        px,py,vx,vy=s\n        rr=(px*px+py*py)**1.5\n        return [vx,vy,-mu*px/rr,-mu*py/rr]\n    s=list(r0)+list(v0)\n    for _ in range(steps):\n        k1=f(s)\n        k2=f([s[i]+h/4*k1[i] for i in range(4)])\n        k3=f([s[i]+h/2*k2[i] for i in range(4)])\n        k4=f([s[i]+h*k3[i] for i in range(4)])\n        s=[s[i]+h/6*(k1[i]+2*k2[i]+2*k3[i]+k4[i]) for i in range(4)]\n    return [round(c,6) for c in s]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115])], [('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804])], [('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274])], [('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991])], [('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782])]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"21c2d4cfa1ec25dd348c7229f7c3f699d0e1989b99df9ce41a888e688dba409f","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\nimport math\nN = 1\nobservations = []\ndef solve(x):\n    r0,v0,mu,T,steps=x\n    h=T/steps\n    def f(s):\n        px,py,vx,vy=s\n        rr=(px*px+py*py)**1.5\n        return [vx,vy,-mu*px/rr,-mu*py/rr]\n    s=list(r0)+list(v0)\n    for _ in range(steps):\n        k1=f(s)\n        k2=f([s[i]+h*k1[i] for i in range(4)])\n        k3=f([s[i]+h/2*k2[i] for i in range(4)])\n        k4=f([s[i]+h*k3[i] for i in range(4)])\n        s=[s[i]+h/6*(k1[i]+2*k2[i]+2*k3[i]+k4[i]) for i in range(4)]\n    return [round(c,6) for c in s]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115])], [('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804])], [('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274])], [('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]', [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30], [-0.98999, 0.141112, -0.141113, -0.989997]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782]), ('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991])], [('fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]', [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25], [-2.095663, 1.089551, -0.384431, -0.37274]), ('fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]', [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10], [-0.154684, -0.721678, 1.394034, 0.039166]), ('fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]', [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6], [6111.623093, 3316.078893, -3.439749, 6.583115]), ('fixed-step rk4 two-body propagation [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8]', [[2.0, 0.0], [0.0, 0.5], 1.0, 4.0, 8], [-0.108631, 0.939625, -0.993051, -0.614991]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]', [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12], [5586.092992, 4218.445527, -4.547562, 6.021804]), ('fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]', [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20], [4101.15166, 6610.394483, -5.692596, 5.332573]), ('fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]', [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15], [-6593.162659, 6759.502773, -4.170281, -4.18782])]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic toy two-body model with stipulated constants and conventions; not flight dynamics software or a validated SGP4 implementation. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-orbital_propagation-rk4_two_body-midpoint-stage","generated_at":"2026-09-29T14:48:12.457957+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Orbit determination and mission planning chain many small conversions; one wrong branch or unit silently moves a spacecraft by kilometres.","root_cause":"k2 is evaluated at s+h*k1 instead of the midpoint.","sha256":"88cfe1e7e246563bb0d637f6299ad6b8040a63dd17d68c0ceb1185b9b1ea9ed1","title":"Fixed-step RK4 two-body propagation: Second RK4 stage samples a full step ahead · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.942,"exit_code":1,"observations":[{"actual":[5606.326774,4231.541789,-4.541473,6.048658],"check":"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]","expected":[5586.092992,4218.445527,-4.547562,6.021804],"passed":false},{"actual":[4123.361019,6637.7484,-5.690718,5.370935],"check":"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]","expected":[4101.15166,6610.394483,-5.692596,5.332573],"passed":false},{"actual":[-6622.808203,6794.837878,-4.202802,-4.180167],"check":"fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]","expected":[-6593.162659,6759.502773,-4.170281,-4.18782],"passed":false},{"actual":[-1.055374,0.269228,-0.281853,-0.920013],"check":"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]","expected":[-0.98999,0.141112,-0.141113,-0.989997],"passed":false},{"actual":[-2.207401,1.347976,-0.461869,-0.291565],"check":"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]","expected":[-2.095663,1.089551,-0.384431,-0.37274],"passed":false},{"actual":[-0.201323,-0.760716,1.362333,-0.053628],"check":"fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]","expected":[-0.154684,-0.721678,1.394034,0.039166],"passed":false},{"actual":[6121.217538,3320.916466,-3.440766,6.59477],"check":"fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]","expected":[6111.623093,3316.078893,-3.439749,6.583115],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]\", \"actual\": [5606.326774, 4231.541789, -4.541473, 6.048658], \"expected\": [5586.092992, 4218.445527, -4.547562, 6.021804], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]\", \"actual\": [4123.361019, 6637.7484, -5.690718, 5.370935], \"expected\": [4101.15166, 6610.394483, -5.692596, 5.332573], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]\", \"actual\": [-6622.808203, 6794.837878, -4.202802, -4.180167], \"expected\": [-6593.162659, 6759.502773, -4.170281, -4.18782], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]\", \"actual\": [-1.055374, 0.269228, -0.281853, -0.920013], \"expected\": [-0.98999, 0.141112, -0.141113, -0.989997], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]\", \"actual\": [-2.207401, 1.347976, -0.461869, -0.291565], \"expected\": [-2.095663, 1.089551, -0.384431, -0.37274], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]\", \"actual\": [-0.201323, -0.760716, 1.362333, -0.053628], \"expected\": [-0.154684, -0.721678, 1.394034, 0.039166], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]\", \"actual\": [6121.217538, 3320.916466, -3.440766, 6.59477], \"expected\": [6111.623093, 3316.078893, -3.439749, 6.583115], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.846,"exit_code":1,"observations":[{"actual":[5546.064346,4192.246038,-4.557381,5.968622],"check":"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]","expected":[5586.092992,4218.445527,-4.547562,6.021804],"passed":false},{"actual":[4057.743705,6555.912848,-5.693804,5.257275],"check":"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]","expected":[4101.15166,6610.394483,-5.692596,5.332573],"passed":false},{"actual":[-6534.003379,6689.605238,-4.10591,-4.200932],"check":"fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]","expected":[-6593.162659,6759.502773,-4.170281,-4.18782],"passed":false},{"actual":[-0.778012,-0.129876,0.302598,-1.083354],"check":"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]","expected":[-0.98999,0.141112,-0.141113,-0.989997],"passed":false},{"actual":[-1.780693,0.561706,-0.158913,-0.543872],"check":"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]","expected":[-2.095663,1.089551,-0.384431,-0.37274],"passed":false},{"actual":[-0.058426,-0.622838,1.440753,0.287752],"check":"fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]","expected":[-0.154684,-0.721678,1.394034,0.039166],"passed":false},{"actual":[6092.550954,3306.445714,-3.436481,6.560305],"check":"fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]","expected":[6111.623093,3316.078893,-3.439749,6.583115],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 7.546], 398600.4418, 600.0, 12]\", \"actual\": [5546.064346, 4192.246038, -4.557381, 5.968622], \"expected\": [5586.092992, 4218.445527, -4.547562, 6.021804], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[7000.0, 0.0], [0.0, 8.5], 398600.4418, 900.0, 20]\", \"actual\": [4057.743705, 6555.912848, -5.693804, 5.257275], \"expected\": [4101.15166, 6610.394483, -5.692596, 5.332573], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[0.0, 9000.0], [-6.2, 0.8], 398600.4418, 1200.0, 15]\", \"actual\": [-6534.003379, 6689.605238, -4.10591, -4.200932], \"expected\": [-6593.162659, 6759.502773, -4.170281, -4.18782], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.0], 1.0, 3.0, 30]\", \"actual\": [-0.778012, -0.129876, 0.302598, -1.083354], \"expected\": [-0.98999, 0.141112, -0.141113, -0.989997], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[1.0, 0.0], [0.0, 1.2], 1.0, 5.0, 25]\", \"actual\": [-1.780693, 0.561706, -0.158913, -0.543872], \"expected\": [-2.095663, 1.089551, -0.384431, -0.37274], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[-1.5, 0.5], [0.1, -0.7], 1.0, 2.0, 10]\", \"actual\": [-0.058426, -0.622838, 1.440753, 0.287752], \"expected\": [-0.154684, -0.721678, 1.394034, 0.039166], \"passed\": false}, {\"check\": \"fixed-step rk4 two-body propagation [[6800.0, 1200.0], [-1.1, 7.4], 398600.4418, 300.0, 6]\", \"actual\": [6092.550954, 3306.445714, -3.436481, 6.560305], \"expected\": [6111.623093, 3316.078893, -3.439749, 6.583115], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}