| 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 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
12:46:19.69 |
-32:43:47.8 |
HIP 62485 |
34.81 |
| 2026-06-01 12:00 |
12:46:10.80 |
-32:41:29.4 |
HIP 62485 |
34.67 |
| 2026-06-02 00:00 |
12:46:02.15 |
-32:39:11.4 |
HIP 62485 |
34.74 |
| 2026-06-02 12:00 |
12:45:53.75 |
-32:36:53.9 |
HIP 62485 |
35.03 |
| 2026-06-03 00:00 |
12:45:45.59 |
-32:34:36.7 |
HIP 62485 |
35.50 |
| 2026-06-03 12:00 |
12:45:37.68 |
-32:32:20.0 |
HIP 62485 |
36.16 |
| 2026-06-04 00:00 |
12:45:30.02 |
-32:30:03.8 |
HIP 62118 |
34.00 |
| 2026-06-04 12:00 |
12:45:22.61 |
-32:27:48.1 |
HIP 62118 |
31.25 |
| 2026-06-05 00:00 |
12:45:15.44 |
-32:25:32.9 |
HIP 62118 |
28.54 |
| 2026-06-05 12:00 |
12:45:08.52 |
-32:23:18.2 |
HIP 62118 |
25.88 |
| 2026-06-06 00:00 |
12:45:01.85 |
-32:21:04.1 |
HIP 62118 |
23.25 |
| 2026-06-06 12:00 |
12:44:55.42 |
-32:18:50.6 |
HIP 62118 |
20.67 |
| 2026-06-07 00:00 |
12:44:49.24 |
-32:16:37.6 |
HIP 62118 |
18.15 |
| 2026-06-07 12:00 |
12:44:43.31 |
-32:14:25.3 |
HIP 62118 |
15.67 |
| 2026-06-08 00:00 |
12:44:37.63 |
-32:12:13.7 |
HIP 62118 |
13.27 |
| 2026-06-08 12:00 |
12:44:32.20 |
-32:10:02.7 |
HIP 62118 |
10.96 |
| 2026-06-09 00:00 |
12:44:27.01 |
-32:07:52.3 |
HIP 62118 |
8.78 |
| 2026-06-09 12:00 |
12:44:22.08 |
-32:05:42.7 |
HIP 62118 |
6.84 |
| 2026-06-10 00:00 |
12:44:17.39 |
-32:03:33.8 |
HIP 62118 |
5.33 |
| 2026-06-10 12:00 |
12:44:12.95 |
-32:01:25.7 |
HIP 62118 |
4.66 |
| 2026-06-11 00:00 |
12:44:08.75 |
-31:59:18.3 |
HIP 62118 |
5.12 |
| 2026-06-11 12:00 |
12:44:04.81 |
-31:57:11.7 |
HIP 62118 |
6.43 |
| 2026-06-12 00:00 |
12:44:01.11 |
-31:55:05.9 |
HIP 62118 |
8.17 |
| 2026-06-12 12:00 |
12:43:57.66 |
-31:53:00.9 |
HIP 62118 |
10.10 |
| 2026-06-13 00:00 |
12:43:54.46 |
-31:50:56.8 |
HIP 62118 |
12.12 |
| 2026-06-13 12:00 |
12:43:51.51 |
-31:48:53.5 |
HIP 62118 |
14.16 |
| 2026-06-14 00:00 |
12:43:48.80 |
-31:46:51.1 |
HIP 62118 |
16.22 |
| 2026-06-14 12:00 |
12:43:46.34 |
-31:44:49.6 |
HIP 62118 |
18.27 |
| 2026-06-15 00:00 |
12:43:44.13 |
-31:42:49.0 |
HIP 62093 |
19.83 |
| 2026-06-15 12:00 |
12:43:42.16 |
-31:40:49.4 |
HIP 62093 |
17.80 |
| 2026-06-16 00:00 |
12:43:40.44 |
-31:38:50.6 |
HIP 62093 |
15.79 |
| 2026-06-16 12:00 |
12:43:38.97 |
-31:36:52.9 |
HIP 62093 |
13.81 |
| 2026-06-17 00:00 |
12:43:37.74 |
-31:34:56.1 |
HIP 62093 |
11.85 |
| 2026-06-17 12:00 |
12:43:36.76 |
-31:33:00.4 |
HIP 62093 |
9.91 |
| 2026-06-18 00:00 |
12:43:36.02 |
-31:31:05.6 |
HIP 62093 |
7.99 |
| 2026-06-18 12:00 |
12:43:35.52 |
-31:29:11.9 |
HIP 62093 |
6.09 |
| 2026-06-19 00:00 |
12:43:35.27 |
-31:27:19.3 |
HIP 62093 |
4.22 |
| 2026-06-19 12:00 |
12:43:35.26 |
-31:25:27.6 |
HIP 62093 |
2.40 |
| 2026-06-20 00:00 |
12:43:35.48 |
-31:23:37.1 |
HIP 62093 |
0.84 |
| 2026-06-20 12:00 |
12:43:35.95 |
-31:21:47.6 |
HIP 62093 |
1.57 |
| 2026-06-21 00:00 |
12:43:36.66 |
-31:19:59.2 |
HIP 62093 |
3.30 |
| 2026-06-21 12:00 |
12:43:37.61 |
-31:18:12.0 |
HIP 62093 |
5.08 |
| 2026-06-22 00:00 |
12:43:38.80 |
-31:16:25.8 |
HIP 62093 |
6.86 |