| 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 |
0.999 |
| gb |
-0.705 |
| k |
0.800 |
| δ90 |
9.995 |
| 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) |
| 2026-05-12 00:00 |
02:36:26.03 |
+20:27:55.6 |
HIP 12161 |
14.70 |
| 2026-05-12 12:00 |
02:36:42.51 |
+20:29:23.3 |
HIP 12161 |
12.66 |
| 2026-05-13 00:00 |
02:36:58.97 |
+20:30:50.9 |
HIP 12238 |
9.05 |
| 2026-05-13 12:00 |
02:37:15.43 |
+20:32:18.5 |
HIP 12238 |
4.94 |
| 2026-05-14 00:00 |
02:37:31.89 |
+20:33:46.2 |
HIP 12238 |
0.93 |
| 2026-05-14 12:00 |
02:37:48.33 |
+20:35:13.8 |
HIP 12238 |
3.35 |
| 2026-05-15 00:00 |
02:38:04.76 |
+20:36:41.4 |
HIP 12238 |
7.45 |
| 2026-05-15 12:00 |
02:38:21.19 |
+20:38:09.0 |
HIP 12238 |
11.55 |
| 2026-05-16 00:00 |
02:38:37.60 |
+20:39:36.5 |
HIP 12238 |
15.66 |
| 2026-05-16 12:00 |
02:38:54.01 |
+20:41:04.1 |
HIP 12238 |
19.76 |
| 2026-05-17 00:00 |
02:39:10.40 |
+20:42:31.6 |
HIP 12238 |
23.86 |
| 2026-05-17 12:00 |
02:39:26.78 |
+20:43:59.1 |
HIP 12238 |
27.96 |
| 2026-05-18 00:00 |
02:39:43.14 |
+20:45:26.5 |
HIP 12468 |
28.20 |
| 2026-05-18 12:00 |
02:39:59.50 |
+20:46:54.0 |
HIP 12468 |
25.50 |
| 2026-05-19 00:00 |
02:40:15.84 |
+20:48:21.4 |
HIP 12468 |
23.21 |
| 2026-05-19 12:00 |
02:40:32.16 |
+20:49:48.7 |
HIP 12591 |
19.92 |
| 2026-05-20 00:00 |
02:40:48.47 |
+20:51:16.0 |
HIP 12591 |
16.57 |
| 2026-05-20 12:00 |
02:41:04.76 |
+20:52:43.3 |
HIP 12591 |
13.62 |
| 2026-05-21 00:00 |
02:41:21.03 |
+20:54:10.5 |
HIP 12591 |
11.40 |
| 2026-05-21 12:00 |
02:41:37.29 |
+20:55:37.7 |
HIP 12591 |
10.37 |
| 2026-05-22 00:00 |
02:41:53.53 |
+20:57:04.8 |
HIP 12591 |
10.87 |
| 2026-05-22 12:00 |
02:42:09.75 |
+20:58:31.9 |
HIP 12591 |
12.72 |
| 2026-05-23 00:00 |
02:42:25.95 |
+20:59:58.9 |
HIP 12591 |
15.43 |
| 2026-05-23 12:00 |
02:42:42.14 |
+21:01:25.9 |
HIP 12733 |
15.61 |
| 2026-05-24 00:00 |
02:42:58.30 |
+21:02:52.8 |
HIP 12733 |
11.62 |
| 2026-05-24 12:00 |
02:43:14.44 |
+21:04:19.6 |
HIP 12733 |
7.67 |
| 2026-05-25 00:00 |
02:43:30.56 |
+21:05:46.4 |
HIP 12733 |
3.92 |
| 2026-05-25 12:00 |
02:43:46.66 |
+21:07:13.1 |
HIP 12733 |
2.07 |
| 2026-05-26 00:00 |
02:44:02.73 |
+21:08:39.8 |
HIP 12733 |
5.05 |
| 2026-05-26 12:00 |
02:44:18.78 |
+21:10:06.4 |
HIP 12733 |
8.88 |
| 2026-05-27 00:00 |
02:44:34.81 |
+21:11:32.9 |
HIP 12733 |
12.82 |
| 2026-05-27 12:00 |
02:44:50.82 |
+21:12:59.3 |
HIP 12733 |
16.78 |
| 2026-05-28 00:00 |
02:45:06.80 |
+21:14:25.7 |
HIP 12733 |
20.75 |
| 2026-05-28 12:00 |
02:45:22.76 |
+21:15:52.0 |
HIP 12819 |
22.48 |
| 2026-05-29 00:00 |
02:45:38.69 |
+21:17:18.2 |
HIP 12819 |
22.81 |
| 2026-05-29 12:00 |
02:45:54.59 |
+21:18:44.3 |
HIP 13029 |
21.84 |
| 2026-05-30 00:00 |
02:46:10.47 |
+21:20:10.4 |
HIP 13029 |
18.06 |
| 2026-05-30 12:00 |
02:46:26.32 |
+21:21:36.4 |
HIP 13029 |
14.39 |
| 2026-05-31 00:00 |
02:46:42.14 |
+21:23:02.2 |
HIP 13029 |
10.93 |
| 2026-05-31 12:00 |
02:46:57.94 |
+21:24:28.0 |
HIP 13029 |
7.94 |
| 2026-06-01 00:00 |
02:47:13.71 |
+21:25:53.7 |
HIP 13029 |
6.15 |
| 2026-06-01 12:00 |
02:47:29.44 |
+21:27:19.4 |
HIP 13029 |
6.61 |
| 2026-06-02 00:00 |
02:47:45.15 |
+21:28:44.9 |
HIP 13029 |
8.97 |