"Horizons Batch for 73P (90000734) on 2027-Dec-23" (Perihelion occurs when rdot flips from negative to positive. r is distance from the Sun and delta is the distance from Earth). JPL Horizons. Archived from the original on 2023-07-10. Retrieved 2023-07-10. (JPL#K222/29 Soln.date: 2023-May-04)
"Horizons Batch for 73P-Y on 2022-08-25" (r is distance from the Sun and delta is the distance from Earth. Uncertainty (RNG_3sigma) is 80 million km which is roughly 0.5AU). JPL Horizons. Retrieved 2023-07-10.
"Horizons Batch for 73P (90000734) on 2027-Dec-23" (Perihelion occurs when rdot flips from negative to positive. r is distance from the Sun and delta is the distance from Earth). JPL Horizons. Archived from the original on 2023-07-10. Retrieved 2023-07-10. (JPL#K222/29 Soln.date: 2023-May-04)