| 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) |
| 2026-03-26 00:00 |
13:30:21.68 |
-35:51:32.4 |
HIP 65808 |
21.20 |
| 2026-03-26 12:00 |
13:30:00.72 |
-35:52:03.4 |
HIP 65808 |
19.53 |
| 2026-03-27 00:00 |
13:29:39.63 |
-35:52:32.4 |
HIP 65738 |
16.72 |
| 2026-03-27 12:00 |
13:29:18.39 |
-35:52:59.2 |
HIP 65738 |
13.75 |
| 2026-03-28 00:00 |
13:28:57.02 |
-35:53:23.9 |
HIP 65738 |
11.62 |
| 2026-03-28 12:00 |
13:28:35.51 |
-35:53:46.4 |
HIP 65671 |
8.29 |
| 2026-03-29 00:00 |
13:28:13.88 |
-35:54:06.9 |
HIP 65671 |
3.96 |
| 2026-03-29 12:00 |
13:27:52.12 |
-35:54:25.2 |
HIP 65671 |
1.19 |
| 2026-03-30 00:00 |
13:27:30.23 |
-35:54:41.4 |
HIP 65671 |
5.14 |
| 2026-03-30 12:00 |
13:27:08.23 |
-35:54:55.5 |
HIP 65671 |
9.56 |
| 2026-03-31 00:00 |
13:26:46.11 |
-35:55:07.4 |
HIP 65671 |
14.03 |
| 2026-03-31 12:00 |
13:26:23.88 |
-35:55:17.2 |
HIP 65671 |
18.53 |
| 2026-04-01 00:00 |
13:26:01.54 |
-35:55:24.9 |
HIP 65453 |
16.07 |
| 2026-04-01 12:00 |
13:25:39.09 |
-35:55:30.4 |
HIP 65453 |
12.42 |
| 2026-04-02 00:00 |
13:25:16.54 |
-35:55:33.8 |
HIP 65453 |
9.51 |
| 2026-04-02 12:00 |
13:24:53.90 |
-35:55:35.0 |
HIP 65453 |
8.25 |
| 2026-04-03 00:00 |
13:24:31.15 |
-35:55:34.1 |
HIP 65453 |
9.34 |
| 2026-04-03 12:00 |
13:24:08.32 |
-35:55:31.0 |
HIP 65453 |
12.20 |
| 2026-04-04 00:00 |
13:23:45.40 |
-35:55:25.7 |
HIP 65453 |
15.91 |
| 2026-04-04 12:00 |
13:23:22.39 |
-35:55:18.4 |
HIP 65244 |
19.30 |
| 2026-04-05 00:00 |
13:22:59.30 |
-35:55:08.8 |
HIP 65244 |
16.14 |
| 2026-04-05 12:00 |
13:22:36.14 |
-35:54:57.1 |
HIP 65244 |
13.83 |
| 2026-04-06 00:00 |
13:22:12.90 |
-35:54:43.3 |
HIP 65244 |
12.86 |
| 2026-04-06 12:00 |
13:21:49.59 |
-35:54:27.3 |
HIP 65208 |
12.28 |
| 2026-04-07 00:00 |
13:21:26.22 |
-35:54:09.2 |
HIP 65208 |
13.45 |
| 2026-04-07 12:00 |
13:21:02.78 |
-35:53:48.9 |
HIP 65208 |
16.04 |
| 2026-04-08 00:00 |
13:20:39.29 |
-35:53:26.5 |
HIP 65208 |
19.49 |
| 2026-04-08 12:00 |
13:20:15.75 |
-35:53:01.9 |
HIP 64978 |
19.51 |
| 2026-04-09 00:00 |
13:19:52.15 |
-35:52:35.3 |
HIP 64978 |
16.66 |
| 2026-04-09 12:00 |
13:19:28.51 |
-35:52:06.5 |
HIP 64978 |
14.87 |
| 2026-04-10 00:00 |
13:19:04.83 |
-35:51:35.5 |
HIP 64978 |
14.57 |
| 2026-04-10 12:00 |
13:18:41.10 |
-35:51:02.5 |
HIP 64978 |
15.83 |
| 2026-04-11 00:00 |
13:18:17.35 |
-35:50:27.3 |
HIP 64978 |
18.36 |
| 2026-04-11 12:00 |
13:17:53.57 |
-35:49:50.1 |
HIP 64978 |
21.72 |
| 2026-04-12 00:00 |
13:17:29.76 |
-35:49:10.7 |
HIP 64978 |
25.59 |
| 2026-04-12 12:00 |
13:17:05.92 |
-35:48:29.3 |
HIP 64978 |
29.78 |
| 2026-04-13 00:00 |
13:16:42.08 |
-35:47:45.8 |
HIP 64978 |
34.17 |
| 2026-04-13 12:00 |
13:16:18.21 |
-35:47:00.2 |
HIP 64597 |
30.87 |
| 2026-04-14 00:00 |
13:15:54.34 |
-35:46:12.5 |
HIP 64597 |
26.86 |
| 2026-04-14 12:00 |
13:15:30.47 |
-35:45:22.9 |
HIP 64597 |
23.17 |
| 2026-04-15 00:00 |
13:15:06.60 |
-35:44:31.1 |
HIP 64597 |
19.99 |
| 2026-04-15 12:00 |
13:14:42.72 |
-35:43:37.4 |
HIP 64597 |
17.60 |
| 2026-04-16 00:00 |
13:14:18.86 |
-35:42:41.6 |
HIP 64542 |
15.79 |