| Parameter |
Value |
| Designation |
331P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-06-16T04:23:51.780480Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:38Z |
| Obs used |
200 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-11-18.0000000 |
| e |
0.04135913 |
| q (au) |
2.880287 |
| a (au) |
3.004552 |
| i (deg) |
9.738157 |
| Ω (om, deg) |
216.839271 |
| ω (w, deg) |
178.117553 |
| M (ma, deg) |
320.222954 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.205 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.205 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.702 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
04:49:57.40 |
+17:59:22.1 |
HIP 22485 |
17.69 |
| 2026-06-01 12:00 |
04:50:47.54 |
+18:00:13.1 |
HIP 22485 |
19.84 |
| 2026-06-02 00:00 |
04:51:37.70 |
+18:01:03.0 |
HIP 22485 |
27.57 |
| 2026-06-02 12:00 |
04:52:27.86 |
+18:01:51.9 |
HIP 22799 |
28.44 |
| 2026-06-03 00:00 |
04:53:18.03 |
+18:02:39.6 |
HIP 22799 |
17.84 |
| 2026-06-03 12:00 |
04:54:08.21 |
+18:03:26.3 |
HIP 22799 |
10.66 |
| 2026-06-04 00:00 |
04:54:58.40 |
+18:04:11.9 |
HIP 22799 |
13.96 |
| 2026-06-04 12:00 |
04:55:48.60 |
+18:04:56.4 |
HIP 22799 |
23.71 |
| 2026-06-05 00:00 |
04:56:38.80 |
+18:05:39.9 |
HIP 23139 |
30.66 |
| 2026-06-05 12:00 |
04:57:29.01 |
+18:06:22.2 |
HIP 23139 |
19.40 |
| 2026-06-06 00:00 |
04:58:19.23 |
+18:07:03.5 |
HIP 23139 |
9.92 |
| 2026-06-06 12:00 |
04:59:09.46 |
+18:07:43.6 |
HIP 23139 |
10.30 |
| 2026-06-07 00:00 |
04:59:59.69 |
+18:08:22.6 |
HIP 23139 |
19.98 |
| 2026-06-07 12:00 |
05:00:49.92 |
+18:09:00.6 |
HIP 23139 |
31.27 |
| 2026-06-08 00:00 |
05:01:40.16 |
+18:09:37.4 |
HIP 23401 |
37.05 |
| 2026-06-08 12:00 |
05:02:30.41 |
+18:10:13.2 |
HIP 23632 |
33.54 |
| 2026-06-09 00:00 |
05:03:20.65 |
+18:10:47.8 |
HIP 23632 |
21.69 |
| 2026-06-09 12:00 |
05:04:10.91 |
+18:11:21.3 |
HIP 23632 |
10.08 |
| 2026-06-10 00:00 |
05:05:01.16 |
+18:11:53.7 |
HIP 23632 |
4.26 |
| 2026-06-10 12:00 |
05:05:51.41 |
+18:12:24.9 |
HIP 23632 |
14.84 |
| 2026-06-11 00:00 |
05:06:41.67 |
+18:12:55.1 |
HIP 23750 |
24.58 |
| 2026-06-11 12:00 |
05:07:31.93 |
+18:13:24.1 |
HIP 23835 |
25.33 |
| 2026-06-12 00:00 |
05:08:22.18 |
+18:13:52.0 |
HIP 24000 |
26.09 |
| 2026-06-12 12:00 |
05:09:12.44 |
+18:14:18.8 |
HIP 24000 |
20.61 |
| 2026-06-13 00:00 |
05:10:02.69 |
+18:14:44.5 |
HIP 24000 |
21.30 |
| 2026-06-13 12:00 |
05:10:52.94 |
+18:15:09.0 |
HIP 24251 |
24.16 |
| 2026-06-14 00:00 |
05:11:43.19 |
+18:15:32.4 |
HIP 24251 |
15.30 |
| 2026-06-14 12:00 |
05:12:33.44 |
+18:15:54.6 |
HIP 24298 |
7.87 |
| 2026-06-15 00:00 |
05:13:23.68 |
+18:16:15.7 |
HIP 24298 |
10.35 |
| 2026-06-15 12:00 |
05:14:13.91 |
+18:16:35.7 |
HIP 24298 |
20.90 |
| 2026-06-16 00:00 |
05:15:04.14 |
+18:16:54.5 |
HIP 24435 |
21.86 |
| 2026-06-16 12:00 |
05:15:54.36 |
+18:17:12.2 |
HIP 24612 |
14.90 |
| 2026-06-17 00:00 |
05:16:44.57 |
+18:17:28.8 |
HIP 24612 |
8.89 |
| 2026-06-17 12:00 |
05:17:34.78 |
+18:17:44.2 |
HIP 24612 |
14.85 |
| 2026-06-18 00:00 |
05:18:24.97 |
+18:17:58.4 |
HIP 24612 |
25.41 |
| 2026-06-18 12:00 |
05:19:15.16 |
+18:18:11.5 |
HIP 24910 |
23.37 |
| 2026-06-19 00:00 |
05:20:05.33 |
+18:18:23.5 |
HIP 24910 |
17.60 |
| 2026-06-19 12:00 |
05:20:55.49 |
+18:18:34.3 |
HIP 24910 |
18.90 |
| 2026-06-20 00:00 |
05:21:45.64 |
+18:18:43.9 |
HIP 24910 |
26.24 |
| 2026-06-20 12:00 |
05:22:35.78 |
+18:18:52.5 |
HIP 25204 |
21.54 |
| 2026-06-21 00:00 |
05:23:25.90 |
+18:18:59.8 |
HIP 25204 |
17.08 |
| 2026-06-21 12:00 |
05:24:16.01 |
+18:19:06.0 |
HIP 25204 |
20.07 |
| 2026-06-22 00:00 |
05:25:06.11 |
+18:19:11.1 |
HIP 25204 |
28.23 |