102P/Shoemaker 1
| Parameter |
Value |
| Designation |
102P/Shoemaker 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-09-01T03:44:39.696000Z |
| Orbit solution date (soln_date, UTC) |
2022-02-06T20:54:12Z |
| Obs used |
392 |
| NEO |
- |
| M1 |
16.200 |
| K1 |
5.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-05-31.0000000 |
| e |
0.47316549 |
| q (au) |
1.968583 |
| a (au) |
3.736626 |
| i (deg) |
26.244906 |
| Ω (om, deg) |
339.873338 |
| ω (w, deg) |
18.744602 |
| M (ma, deg) |
297.483004 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.195 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.195 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.784 |
| k |
0.800 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:47:37.36 |
-32:32:02.8 |
HIP 67308 |
6.33 |
| 2026-02-03 12:00 |
13:47:38.95 |
-32:34:59.5 |
HIP 67308 |
9.22 |
| 2026-02-04 00:00 |
13:47:40.32 |
-32:37:55.6 |
HIP 67308 |
12.13 |
| 2026-02-04 12:00 |
13:47:41.47 |
-32:40:50.9 |
HIP 67308 |
15.05 |
| 2026-02-05 00:00 |
13:47:42.39 |
-32:43:45.5 |
HIP 67224 |
15.06 |
| 2026-02-05 12:00 |
13:47:43.09 |
-32:46:39.4 |
HIP 67224 |
15.40 |
| 2026-02-06 00:00 |
13:47:43.57 |
-32:49:32.5 |
HIP 67224 |
16.21 |
| 2026-02-06 12:00 |
13:47:43.81 |
-32:52:24.9 |
HIP 67224 |
17.41 |
| 2026-02-07 00:00 |
13:47:43.83 |
-32:55:16.4 |
HIP 67224 |
18.94 |
| 2026-02-07 12:00 |
13:47:43.62 |
-32:58:07.2 |
HIP 67224 |
20.70 |
| 2026-02-08 00:00 |
13:47:43.18 |
-33:00:57.2 |
HIP 67224 |
22.64 |
| 2026-02-08 12:00 |
13:47:42.51 |
-33:03:46.4 |
HIP 67224 |
24.72 |
| 2026-02-09 00:00 |
13:47:41.61 |
-33:06:34.8 |
HIP 67153 |
25.46 |
| 2026-02-09 12:00 |
13:47:40.48 |
-33:09:22.3 |
HIP 67176 |
25.48 |
| 2026-02-10 00:00 |
13:47:39.11 |
-33:12:09.0 |
HIP 67176 |
23.76 |
| 2026-02-10 12:00 |
13:47:37.51 |
-33:14:54.7 |
HIP 67176 |
22.23 |
| 2026-02-11 00:00 |
13:47:35.67 |
-33:17:39.7 |
HIP 67176 |
20.91 |
| 2026-02-11 12:00 |
13:47:33.60 |
-33:20:23.7 |
HIP 67176 |
19.84 |
| 2026-02-12 00:00 |
13:47:31.29 |
-33:23:06.8 |
HIP 67176 |
19.07 |
| 2026-02-12 12:00 |
13:47:28.74 |
-33:25:48.9 |
HIP 67179 |
18.05 |
| 2026-02-13 00:00 |
13:47:25.96 |
-33:28:30.2 |
HIP 67179 |
17.33 |
| 2026-02-13 12:00 |
13:47:22.93 |
-33:31:10.4 |
HIP 67179 |
16.98 |
| 2026-02-14 00:00 |
13:47:19.67 |
-33:33:49.8 |
HIP 67222 |
16.47 |
| 2026-02-14 12:00 |
13:47:16.17 |
-33:36:28.1 |
HIP 67222 |
14.03 |
| 2026-02-15 00:00 |
13:47:12.42 |
-33:39:05.4 |
HIP 67222 |
11.68 |
| 2026-02-15 12:00 |
13:47:08.44 |
-33:41:41.7 |
HIP 67222 |
9.52 |
| 2026-02-16 00:00 |
13:47:04.21 |
-33:44:17.0 |
HIP 67222 |
7.68 |
| 2026-02-16 12:00 |
13:46:59.74 |
-33:46:51.2 |
HIP 67222 |
6.44 |
| 2026-02-17 00:00 |
13:46:55.03 |
-33:49:24.4 |
HIP 67222 |
6.20 |
| 2026-02-17 12:00 |
13:46:50.08 |
-33:51:56.5 |
HIP 67222 |
7.05 |
| 2026-02-18 00:00 |
13:46:44.88 |
-33:54:27.5 |
HIP 67222 |
8.68 |
| 2026-02-18 12:00 |
13:46:39.44 |
-33:56:57.4 |
HIP 67181 |
7.48 |
| 2026-02-19 00:00 |
13:46:33.76 |
-33:59:26.2 |
HIP 67181 |
6.96 |
| 2026-02-19 12:00 |
13:46:27.83 |
-34:01:53.8 |
HIP 67181 |
7.43 |
| 2026-02-20 00:00 |
13:46:21.66 |
-34:04:20.3 |
HIP 67181 |
8.75 |
| 2026-02-20 12:00 |
13:46:15.24 |
-34:06:45.6 |
HIP 67181 |
10.60 |
| 2026-02-21 00:00 |
13:46:08.58 |
-34:09:09.7 |
HIP 67181 |
12.76 |
| 2026-02-21 12:00 |
13:46:01.68 |
-34:11:32.7 |
HIP 67181 |
15.10 |
| 2026-02-22 00:00 |
13:45:54.54 |
-34:13:54.4 |
HIP 67114 |
16.72 |
| 2026-02-22 12:00 |
13:45:47.14 |
-34:16:14.9 |
HIP 67114 |
13.97 |
| 2026-02-23 00:00 |
13:45:39.51 |
-34:18:34.2 |
HIP 67114 |
11.23 |
| 2026-02-23 12:00 |
13:45:31.63 |
-34:20:52.2 |
HIP 67114 |
8.54 |
| 2026-02-24 00:00 |
13:45:23.52 |
-34:23:08.9 |
HIP 67114 |
5.99 |