| 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) |
| 2026-09-20 00:00 |
07:40:49.49 |
+13:42:11.9 |
HIP 37404 |
4.12 |
| 2026-09-20 12:00 |
07:41:25.70 |
+13:39:20.5 |
HIP 37404 |
11.64 |
| 2026-09-21 00:00 |
07:42:01.76 |
+13:36:28.5 |
HIP 37508 |
8.01 |
| 2026-09-21 12:00 |
07:42:37.66 |
+13:33:36.1 |
HIP 37508 |
12.11 |
| 2026-09-22 00:00 |
07:43:13.40 |
+13:30:43.1 |
HIP 37665 |
11.78 |
| 2026-09-22 12:00 |
07:43:48.99 |
+13:27:49.6 |
HIP 37665 |
12.41 |
| 2026-09-23 00:00 |
07:44:24.41 |
+13:24:55.6 |
HIP 37665 |
18.30 |
| 2026-09-23 12:00 |
07:44:59.68 |
+13:22:01.1 |
HIP 37665 |
26.07 |
| 2026-09-24 00:00 |
07:45:34.79 |
+13:19:06.2 |
HIP 37920 |
26.55 |
| 2026-09-24 12:00 |
07:46:09.74 |
+13:16:10.7 |
HIP 37920 |
27.58 |
| 2026-09-25 00:00 |
07:46:44.52 |
+13:13:14.8 |
HIP 38094 |
26.71 |
| 2026-09-25 12:00 |
07:47:19.14 |
+13:10:18.4 |
HIP 38094 |
21.44 |
| 2026-09-26 00:00 |
07:47:53.59 |
+13:07:21.5 |
HIP 38094 |
19.13 |
| 2026-09-26 12:00 |
07:48:27.88 |
+13:04:24.2 |
HIP 38147 |
19.72 |
| 2026-09-27 00:00 |
07:49:02.01 |
+13:01:26.5 |
HIP 38196 |
14.59 |
| 2026-09-27 12:00 |
07:49:35.96 |
+12:58:28.3 |
HIP 38196 |
9.65 |
| 2026-09-28 00:00 |
07:50:09.75 |
+12:55:29.7 |
HIP 38196 |
11.28 |
| 2026-09-28 12:00 |
07:50:43.36 |
+12:52:30.6 |
HIP 38196 |
17.70 |
| 2026-09-29 00:00 |
07:51:16.80 |
+12:49:31.2 |
HIP 38196 |
25.48 |
| 2026-09-29 12:00 |
07:51:50.07 |
+12:46:31.3 |
HIP 38196 |
33.67 |
| 2026-09-30 00:00 |
07:52:23.17 |
+12:43:31.1 |
HIP 38669 |
39.85 |
| 2026-09-30 12:00 |
07:52:56.09 |
+12:40:30.5 |
HIP 38669 |
31.36 |
| 2026-10-01 00:00 |
07:53:28.84 |
+12:37:29.4 |
HIP 38669 |
22.97 |
| 2026-10-01 12:00 |
07:54:01.40 |
+12:34:28.1 |
HIP 38669 |
14.79 |
| 2026-10-02 00:00 |
07:54:33.79 |
+12:31:26.3 |
HIP 38669 |
7.41 |
| 2026-10-02 12:00 |
07:55:06.00 |
+12:28:24.2 |
HIP 38669 |
5.85 |
| 2026-10-03 00:00 |
07:55:38.02 |
+12:25:21.8 |
HIP 38669 |
12.45 |
| 2026-10-03 12:00 |
07:56:09.86 |
+12:22:19.0 |
HIP 38767 |
16.88 |
| 2026-10-04 00:00 |
07:56:41.51 |
+12:19:15.9 |
HIP 38767 |
21.39 |
| 2026-10-04 12:00 |
07:57:12.98 |
+12:16:12.5 |
HIP 38989 |
24.43 |
| 2026-10-05 00:00 |
07:57:44.26 |
+12:13:08.8 |
HIP 38989 |
16.20 |
| 2026-10-05 12:00 |
07:58:15.35 |
+12:10:04.8 |
HIP 38989 |
8.01 |
| 2026-10-06 00:00 |
07:58:46.25 |
+12:07:00.6 |
HIP 38989 |
0.24 |
| 2026-10-06 12:00 |
07:59:16.95 |
+12:03:56.0 |
HIP 38989 |
8.26 |
| 2026-10-07 00:00 |
07:59:47.46 |
+12:00:51.2 |
HIP 39140 |
14.58 |
| 2026-10-07 12:00 |
08:00:17.77 |
+11:57:46.2 |
HIP 39140 |
15.08 |
| 2026-10-08 00:00 |
08:00:47.89 |
+11:54:40.9 |
HIP 39140 |
19.25 |
| 2026-10-08 12:00 |
08:01:17.80 |
+11:51:35.4 |
HIP 39140 |
25.30 |
| 2026-10-09 00:00 |
08:01:47.52 |
+11:48:29.7 |
HIP 39140 |
32.15 |
| 2026-10-09 12:00 |
08:02:17.03 |
+11:45:23.8 |
HIP 39404 |
28.97 |
| 2026-10-10 00:00 |
08:02:46.34 |
+11:42:17.7 |
HIP 39404 |
22.93 |
| 2026-10-10 12:00 |
08:03:15.44 |
+11:39:11.4 |
HIP 39404 |
18.30 |
| 2026-10-11 00:00 |
08:03:44.34 |
+11:36:04.9 |
HIP 39404 |
16.26 |