| 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
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 |