C/1988 B1 (Shoemaker)

Metadata

Parameter Value
Designation C/1988 B1 (Shoemaker)
Type C
Perihelion (tp_cal, UTC) 1987-03-20T04:30:14.852160Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:36Z
Obs used 63
NEO -
M1 5.600
K1 10.000
PC -
Osculating Elements
Parameter Value
Epoch (epoch_cal, TDB) 1988-07-24.0000000
e 1.00306479
q (au) 5.030939
a (au) -1641.528202
i (deg) 80.568294
Ω (om, deg) 325.168069
ω (w, deg) 124.223736
M (ma, deg) 0.007288

Magnitude

C/1988 B1 (Shoemaker) · Magnitude (Full range)

Scatter + Global Linear

$$ M_a = (8.483 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

Model Parameters

Parameter Value
H0 8.483
n 2.000
gf 1.000
gb -0.500
k 1.000
δ90 10.000
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)
2026-09-20 00:00 07:23:31.79 -73:36:18.6 HIP 35470 25.82
2026-09-20 12:00 07:23:34.05 -73:36:46.7 HIP 35470 25.59
2026-09-21 00:00 07:23:36.25 -73:37:14.9 HIP 35470 25.36
2026-09-21 12:00 07:23:38.41 -73:37:43.1 HIP 35470 25.14
2026-09-22 00:00 07:23:40.51 -73:38:11.4 HIP 35470 24.92
2026-09-22 12:00 07:23:42.56 -73:38:39.9 HIP 35470 24.70
2026-09-23 00:00 07:23:44.55 -73:39:08.4 HIP 35470 24.49
2026-09-23 12:00 07:23:46.49 -73:39:36.9 HIP 35470 24.28
2026-09-24 00:00 07:23:48.38 -73:40:05.6 HIP 35470 24.07
2026-09-24 12:00 07:23:50.22 -73:40:34.4 HIP 35470 23.87
2026-09-25 00:00 07:23:52.00 -73:41:03.2 HIP 35470 23.68
2026-09-25 12:00 07:23:53.73 -73:41:32.1 HIP 35470 23.49
2026-09-26 00:00 07:23:55.40 -73:42:01.0 HIP 35470 23.30
2026-09-26 12:00 07:23:57.02 -73:42:30.1 HIP 35470 23.13
2026-09-27 00:00 07:23:58.58 -73:42:59.2 HIP 35470 22.95
2026-09-27 12:00 07:24:00.09 -73:43:28.4 HIP 35470 22.78
2026-09-28 00:00 07:24:01.54 -73:43:57.6 HIP 35470 22.62
2026-09-28 12:00 07:24:02.94 -73:44:26.9 HIP 35470 22.46
2026-09-29 00:00 07:24:04.28 -73:44:56.3 HIP 35470 22.31
2026-09-29 12:00 07:24:05.57 -73:45:25.7 HIP 35794 21.97
2026-09-30 00:00 07:24:06.80 -73:45:55.2 HIP 35794 21.51
2026-09-30 12:00 07:24:07.98 -73:46:24.8 HIP 35794 21.04
2026-10-01 00:00 07:24:09.10 -73:46:54.4 HIP 35794 20.58
2026-10-01 12:00 07:24:10.16 -73:47:24.0 HIP 35794 20.12
2026-10-02 00:00 07:24:11.16 -73:47:53.7 HIP 35794 19.65
2026-10-02 12:00 07:24:12.11 -73:48:23.5 HIP 35794 19.19
2026-10-03 00:00 07:24:13.00 -73:48:53.3 HIP 35794 18.73
2026-10-03 12:00 07:24:13.83 -73:49:23.1 HIP 35794 18.26
2026-10-04 00:00 07:24:14.61 -73:49:53.0 HIP 35794 17.80
2026-10-04 12:00 07:24:15.33 -73:50:23.0 HIP 35794 17.34
2026-10-05 00:00 07:24:15.99 -73:50:52.9 HIP 35794 16.88
2026-10-05 12:00 07:24:16.59 -73:51:23.0 HIP 35794 16.42
2026-10-06 00:00 07:24:17.13 -73:51:53.0 HIP 35794 15.95
2026-10-06 12:00 07:24:17.61 -73:52:23.1 HIP 35794 15.49
2026-10-07 00:00 07:24:18.04 -73:52:53.2 HIP 35794 15.03
2026-10-07 12:00 07:24:18.40 -73:53:23.3 HIP 35794 14.57
2026-10-08 00:00 07:24:18.71 -73:53:53.5 HIP 35794 14.12
2026-10-08 12:00 07:24:18.96 -73:54:23.7 HIP 35794 13.66
2026-10-09 00:00 07:24:19.14 -73:54:53.9 HIP 35794 13.20
2026-10-09 12:00 07:24:19.27 -73:55:24.2 HIP 35794 12.75
2026-10-10 00:00 07:24:19.34 -73:55:54.4 HIP 35794 12.30
2026-10-10 12:00 07:24:19.35 -73:56:24.7 HIP 35794 11.85
2026-10-11 00:00 07:24:19.29 -73:56:55.0 HIP 35794 11.40