135P/Shoemaker-Levy 8

Metadata

Parameter Value
Designation 135P/Shoemaker-Levy 8
Type P
Perihelion (tp_cal, UTC) 1999-12-10T12:02:32.936640Z
Orbit solution date (soln_date, UTC) 2024-03-14T08:42:34Z
Obs used 115
NEO -
M1 7.000
K1 17.000
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1997-02-21.0000000
e 0.29022851
q (au) 2.716890
a (au) 3.827837
i (deg) 6.050581
Ω (om, deg) 213.361982
ω (w, deg) 22.698035
M (ma, deg) 225.433199

Magnitude

135P/Shoemaker-Levy 8 · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (14.084 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 14.084
n 2.000
gf 0.998
gb -1.000
k 1.000
δ90 9.995
Parameter Symbol Range Description
Absolute magnitude at 1 AU from Sun and Earth H0 -5 to 20 Intrinsic brightness of the comet
Photometric slope parameter n 2 to 6 Rate of brightness change with heliocentric distance
Forward scattering asymmetry factor gf 0.8 to 1 Degree of forward scattering
Backward scattering asymmetry factor gb -1 to -0.5 Degree of backward scattering
Partitioning coefficient k 0.8 to 1 Ratio between forward/backward scattering contributions
Dust-to-gas brightness ratio δ90 1 to 10 Relative contribution of dust scattering to gas emission

Reference: EPSC-DPS2025-160

Ephemeris

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-07-29 00:00 05:20:53.71 +19:45:01.3 HIP 24977 3.90
2026-07-29 12:00 05:21:18.47 +19:45:02.6 HIP 24977 6.40
2026-07-30 00:00 05:21:43.15 +19:45:03.4 HIP 25086 8.92
2026-07-30 12:00 05:22:07.75 +19:45:03.7 HIP 25086 5.24
2026-07-31 00:00 05:22:32.27 +19:45:03.6 HIP 25086 6.50
2026-07-31 12:00 05:22:56.71 +19:45:03.1 HIP 25086 11.10
2026-08-01 00:00 05:23:21.06 +19:45:02.1 HIP 25086 16.43
2026-08-01 12:00 05:23:45.34 +19:45:00.7 HIP 25250 15.20
2026-08-02 00:00 05:24:09.52 +19:44:58.9 HIP 25250 15.26
2026-08-02 12:00 05:24:33.63 +19:44:56.6 HIP 25250 17.31
2026-08-03 00:00 05:24:57.64 +19:44:53.8 HIP 25250 20.73
2026-08-03 12:00 05:25:21.57 +19:44:50.7 HIP 25250 24.97
2026-08-04 00:00 05:25:45.42 +19:44:47.1 HIP 25510 26.34
2026-08-04 12:00 05:26:09.17 +19:44:43.0 HIP 25510 22.02
2026-08-05 00:00 05:26:32.84 +19:44:38.6 HIP 25510 18.42
2026-08-05 12:00 05:26:56.41 +19:44:33.7 HIP 25510 15.99
2026-08-06 00:00 05:27:19.89 +19:44:28.3 HIP 25510 15.30
2026-08-06 12:00 05:27:43.28 +19:44:22.6 HIP 25510 16.53
2026-08-07 00:00 05:28:06.58 +19:44:16.4 HIP 25510 19.30
2026-08-07 12:00 05:28:29.78 +19:44:09.8 HIP 25510 23.06
2026-08-08 00:00 05:28:52.89 +19:44:02.8 HIP 25726 21.61
2026-08-08 12:00 05:29:15.90 +19:43:55.3 HIP 25726 19.74
2026-08-09 00:00 05:29:38.81 +19:43:47.4 HIP 25834 18.52
2026-08-09 12:00 05:30:01.63 +19:43:39.1 HIP 25834 13.32
2026-08-10 00:00 05:30:24.34 +19:43:30.4 HIP 25834 8.38
2026-08-10 12:00 05:30:46.96 +19:43:21.2 HIP 25834 4.49
2026-08-11 00:00 05:31:09.47 +19:43:11.7 HIP 25834 5.17
2026-08-11 12:00 05:31:31.88 +19:43:01.7 HIP 25834 9.44
2026-08-12 00:00 05:31:54.18 +19:42:51.3 HIP 25908 9.96
2026-08-12 12:00 05:32:16.38 +19:42:40.6 HIP 25908 11.94
2026-08-13 00:00 05:32:38.47 +19:42:29.4 HIP 25908 15.49
2026-08-13 12:00 05:33:00.45 +19:42:17.8 HIP 25908 19.76
2026-08-14 00:00 05:33:22.33 +19:42:05.8 HIP 26018 20.40
2026-08-14 12:00 05:33:44.10 +19:41:53.4 HIP 26018 22.09
2026-08-15 00:00 05:34:05.75 +19:41:40.6 HIP 26229 17.59
2026-08-15 12:00 05:34:27.30 +19:41:27.4 HIP 26229 12.73
2026-08-16 00:00 05:34:48.73 +19:41:13.8 HIP 26229 8.15
2026-08-16 12:00 05:35:10.05 +19:40:59.8 HIP 26229 4.68
2026-08-17 00:00 05:35:31.25 +19:40:45.4 HIP 26229 5.28
2026-08-17 12:00 05:35:52.34 +19:40:30.7 HIP 26298 7.92
2026-08-18 00:00 05:36:13.31 +19:40:15.5 HIP 26298 7.72
2026-08-18 12:00 05:36:34.17 +19:40:00.0 HIP 26298 10.24
2026-08-19 00:00 05:36:54.90 +19:39:44.1 HIP 26438 11.66