| Parameter |
Value |
| Designation |
P/2011 C2 (Gibbs) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-01-07T21:49:24.366720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:48Z |
| Obs used |
184 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-10-11.0000000 |
| e |
0.26847186 |
| q (au) |
5.388548 |
| a (au) |
7.366152 |
| i (deg) |
10.910944 |
| Ω (om, deg) |
12.201981 |
| ω (w, deg) |
160.563612 |
| M (ma, deg) |
355.616810 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.134 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.134 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.705 |
| k |
0.800 |
| δ90 |
9.974 |
| 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 |
03:15:24.41 |
+25:08:19.1 |
HIP 15030 |
25.04 |
| 2026-09-20 12:00 |
03:15:19.71 |
+25:08:36.9 |
HIP 15030 |
24.16 |
| 2026-09-21 00:00 |
03:15:14.89 |
+25:08:54.1 |
HIP 15030 |
23.28 |
| 2026-09-21 12:00 |
03:15:09.94 |
+25:09:10.8 |
HIP 15030 |
22.38 |
| 2026-09-22 00:00 |
03:15:04.86 |
+25:09:27.0 |
HIP 15030 |
21.49 |
| 2026-09-22 12:00 |
03:14:59.66 |
+25:09:42.6 |
HIP 15030 |
20.59 |
| 2026-09-23 00:00 |
03:14:54.34 |
+25:09:57.6 |
HIP 15030 |
19.70 |
| 2026-09-23 12:00 |
03:14:48.90 |
+25:10:12.2 |
HIP 15030 |
18.82 |
| 2026-09-24 00:00 |
03:14:43.33 |
+25:10:26.1 |
HIP 15030 |
17.95 |
| 2026-09-24 12:00 |
03:14:37.64 |
+25:10:39.5 |
HIP 15030 |
17.11 |
| 2026-09-25 00:00 |
03:14:31.83 |
+25:10:52.4 |
HIP 15030 |
16.31 |
| 2026-09-25 12:00 |
03:14:25.90 |
+25:11:04.7 |
HIP 15030 |
15.56 |
| 2026-09-26 00:00 |
03:14:19.85 |
+25:11:16.4 |
HIP 15030 |
14.87 |
| 2026-09-26 12:00 |
03:14:13.68 |
+25:11:27.6 |
HIP 15030 |
14.25 |
| 2026-09-27 00:00 |
03:14:07.40 |
+25:11:38.2 |
HIP 15030 |
13.74 |
| 2026-09-27 12:00 |
03:14:00.99 |
+25:11:48.3 |
HIP 15030 |
13.34 |
| 2026-09-28 00:00 |
03:13:54.47 |
+25:11:57.8 |
HIP 15030 |
13.08 |
| 2026-09-28 12:00 |
03:13:47.82 |
+25:12:06.7 |
HIP 15030 |
12.97 |
| 2026-09-29 00:00 |
03:13:41.07 |
+25:12:15.1 |
HIP 15030 |
13.03 |
| 2026-09-29 12:00 |
03:13:34.19 |
+25:12:22.9 |
HIP 15030 |
13.26 |
| 2026-09-30 00:00 |
03:13:27.20 |
+25:12:30.1 |
HIP 15030 |
13.66 |
| 2026-09-30 12:00 |
03:13:20.10 |
+25:12:36.8 |
HIP 15030 |
14.23 |
| 2026-10-01 00:00 |
03:13:12.88 |
+25:12:42.9 |
HIP 15030 |
14.96 |
| 2026-10-01 12:00 |
03:13:05.55 |
+25:12:48.4 |
HIP 15030 |
15.82 |
| 2026-10-02 00:00 |
03:12:58.10 |
+25:12:53.3 |
HIP 15030 |
16.82 |
| 2026-10-02 12:00 |
03:12:50.54 |
+25:12:57.7 |
HIP 15030 |
17.92 |
| 2026-10-03 00:00 |
03:12:42.88 |
+25:13:01.4 |
HIP 14984 |
18.81 |
| 2026-10-03 12:00 |
03:12:35.10 |
+25:13:04.7 |
HIP 14984 |
19.38 |
| 2026-10-04 00:00 |
03:12:27.21 |
+25:13:07.3 |
HIP 14984 |
20.11 |
| 2026-10-04 12:00 |
03:12:19.21 |
+25:13:09.3 |
HIP 14984 |
20.98 |
| 2026-10-05 00:00 |
03:12:11.10 |
+25:13:10.8 |
HIP 14984 |
22.00 |
| 2026-10-05 12:00 |
03:12:02.89 |
+25:13:11.7 |
HIP 14984 |
23.13 |
| 2026-10-06 00:00 |
03:11:54.56 |
+25:13:12.0 |
HIP 14984 |
24.38 |
| 2026-10-06 12:00 |
03:11:46.14 |
+25:13:11.7 |
HIP 14984 |
25.73 |
| 2026-10-07 00:00 |
03:11:37.61 |
+25:13:10.8 |
HIP 14984 |
27.17 |
| 2026-10-07 12:00 |
03:11:28.97 |
+25:13:09.4 |
HIP 14984 |
28.69 |
| 2026-10-08 00:00 |
03:11:20.23 |
+25:13:07.3 |
HIP 14984 |
30.29 |
| 2026-10-08 12:00 |
03:11:11.39 |
+25:13:04.7 |
HIP 14984 |
31.95 |
| 2026-10-09 00:00 |
03:11:02.45 |
+25:13:01.5 |
HIP 14621 |
31.06 |
| 2026-10-09 12:00 |
03:10:53.41 |
+25:12:57.7 |
HIP 14621 |
29.13 |
| 2026-10-10 00:00 |
03:10:44.27 |
+25:12:53.3 |
HIP 14621 |
27.21 |
| 2026-10-10 12:00 |
03:10:35.04 |
+25:12:48.4 |
HIP 14621 |
25.28 |
| 2026-10-11 00:00 |
03:10:25.71 |
+25:12:42.9 |
HIP 14621 |
23.37 |