| Parameter |
Value |
| Designation |
142P/Ge-Wang |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-05-30T02:38:24.838080Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T12:22:34Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-04-21.0000000 |
| e |
0.49914641 |
| q (au) |
2.487408 |
| a (au) |
4.966337 |
| i (deg) |
12.307409 |
| Ω (om, deg) |
176.518490 |
| ω (w, deg) |
175.630058 |
| M (ma, deg) |
29.021568 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.996 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.996 |
| 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 |
11:14:41.05 |
+03:04:00.8 |
HIP 54853 |
24.93 |
| 2026-09-20 12:00 |
11:14:57.24 |
+03:02:29.4 |
HIP 54853 |
28.43 |
| 2026-09-21 00:00 |
11:15:13.42 |
+03:00:58.0 |
HIP 54853 |
32.13 |
| 2026-09-21 12:00 |
11:15:29.58 |
+02:59:26.6 |
HIP 54853 |
35.96 |
| 2026-09-22 00:00 |
11:15:45.73 |
+02:57:55.2 |
HIP 54853 |
39.89 |
| 2026-09-22 12:00 |
11:16:01.86 |
+02:56:23.9 |
HIP 55231 |
40.67 |
| 2026-09-23 00:00 |
11:16:17.98 |
+02:54:52.6 |
HIP 55231 |
37.36 |
| 2026-09-23 12:00 |
11:16:34.08 |
+02:53:21.3 |
HIP 55231 |
34.28 |
| 2026-09-24 00:00 |
11:16:50.16 |
+02:51:50.1 |
HIP 55231 |
31.49 |
| 2026-09-24 12:00 |
11:17:06.22 |
+02:50:19.0 |
HIP 55231 |
29.07 |
| 2026-09-25 00:00 |
11:17:22.27 |
+02:48:47.8 |
HIP 55231 |
27.12 |
| 2026-09-25 12:00 |
11:17:38.29 |
+02:47:16.8 |
HIP 55231 |
25.74 |
| 2026-09-26 00:00 |
11:17:54.30 |
+02:45:45.8 |
HIP 55231 |
25.02 |
| 2026-09-26 12:00 |
11:18:10.29 |
+02:44:14.8 |
HIP 55231 |
25.03 |
| 2026-09-27 00:00 |
11:18:26.25 |
+02:42:43.9 |
HIP 55231 |
25.75 |
| 2026-09-27 12:00 |
11:18:42.20 |
+02:41:13.1 |
HIP 55231 |
27.13 |
| 2026-09-28 00:00 |
11:18:58.12 |
+02:39:42.4 |
HIP 55231 |
29.08 |
| 2026-09-28 12:00 |
11:19:14.02 |
+02:38:11.7 |
HIP 55408 |
27.16 |
| 2026-09-29 00:00 |
11:19:29.90 |
+02:36:41.1 |
HIP 55416 |
24.32 |
| 2026-09-29 12:00 |
11:19:45.76 |
+02:35:10.6 |
HIP 55416 |
20.12 |
| 2026-09-30 00:00 |
11:20:01.59 |
+02:33:40.2 |
HIP 55416 |
15.94 |
| 2026-09-30 12:00 |
11:20:17.40 |
+02:32:09.9 |
HIP 55416 |
11.81 |
| 2026-10-01 00:00 |
11:20:33.19 |
+02:30:39.6 |
HIP 55416 |
7.79 |
| 2026-10-01 12:00 |
11:20:48.95 |
+02:29:09.5 |
HIP 55416 |
4.20 |
| 2026-10-02 00:00 |
11:21:04.68 |
+02:27:39.4 |
HIP 55416 |
3.16 |
| 2026-10-02 12:00 |
11:21:20.39 |
+02:26:09.5 |
HIP 55416 |
6.13 |
| 2026-10-03 00:00 |
11:21:36.07 |
+02:24:39.7 |
HIP 55416 |
10.02 |
| 2026-10-03 12:00 |
11:21:51.72 |
+02:23:10.0 |
HIP 55416 |
14.08 |
| 2026-10-04 00:00 |
11:22:07.35 |
+02:21:40.4 |
HIP 55416 |
18.19 |
| 2026-10-04 12:00 |
11:22:22.94 |
+02:20:10.9 |
HIP 55416 |
22.31 |
| 2026-10-05 00:00 |
11:22:38.51 |
+02:18:41.6 |
HIP 55416 |
26.45 |
| 2026-10-05 12:00 |
11:22:54.05 |
+02:17:12.4 |
HIP 55699 |
30.00 |
| 2026-10-06 00:00 |
11:23:09.56 |
+02:15:43.3 |
HIP 55699 |
25.86 |
| 2026-10-06 12:00 |
11:23:25.03 |
+02:14:14.4 |
HIP 55699 |
21.72 |
| 2026-10-07 00:00 |
11:23:40.48 |
+02:12:45.6 |
HIP 55699 |
17.59 |
| 2026-10-07 12:00 |
11:23:55.89 |
+02:11:16.9 |
HIP 55699 |
13.47 |
| 2026-10-08 00:00 |
11:24:11.27 |
+02:09:48.5 |
HIP 55699 |
9.36 |
| 2026-10-08 12:00 |
11:24:26.62 |
+02:08:20.2 |
HIP 55699 |
5.28 |
| 2026-10-09 00:00 |
11:24:41.93 |
+02:06:52.0 |
HIP 55699 |
1.34 |
| 2026-10-09 12:00 |
11:24:57.21 |
+02:05:24.0 |
HIP 55699 |
3.05 |
| 2026-10-10 00:00 |
11:25:12.45 |
+02:03:56.2 |
HIP 55699 |
7.07 |
| 2026-10-10 12:00 |
11:25:27.65 |
+02:02:28.6 |
HIP 55699 |
11.13 |
| 2026-10-11 00:00 |
11:25:42.82 |
+02:01:01.2 |
HIP 55699 |
15.19 |