P/2011 C2 (Gibbs)
| 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) |
| 2026-02-03 00:00 |
01:52:24.90 |
+16:41:43.1 |
HIP 8667 |
21.01 |
| 2026-02-03 12:00 |
01:52:31.75 |
+16:42:13.9 |
HIP 8667 |
22.34 |
| 2026-02-04 00:00 |
01:52:38.70 |
+16:42:45.3 |
HIP 8816 |
23.46 |
| 2026-02-04 12:00 |
01:52:45.75 |
+16:43:17.2 |
HIP 8816 |
22.30 |
| 2026-02-05 00:00 |
01:52:52.91 |
+16:43:49.7 |
HIP 8816 |
21.21 |
| 2026-02-05 12:00 |
01:53:00.17 |
+16:44:22.9 |
HIP 8816 |
20.20 |
| 2026-02-06 00:00 |
01:53:07.53 |
+16:44:56.5 |
HIP 8816 |
19.31 |
| 2026-02-06 12:00 |
01:53:15.00 |
+16:45:30.8 |
HIP 8816 |
18.54 |
| 2026-02-07 00:00 |
01:53:22.56 |
+16:46:05.6 |
HIP 8816 |
17.93 |
| 2026-02-07 12:00 |
01:53:30.23 |
+16:46:41.1 |
HIP 8816 |
17.49 |
| 2026-02-08 00:00 |
01:53:37.99 |
+16:47:17.0 |
HIP 8816 |
17.26 |
| 2026-02-08 12:00 |
01:53:45.85 |
+16:47:53.6 |
HIP 8816 |
17.25 |
| 2026-02-09 00:00 |
01:53:53.82 |
+16:48:30.7 |
HIP 8816 |
17.46 |
| 2026-02-09 12:00 |
01:54:01.88 |
+16:49:08.4 |
HIP 8816 |
17.91 |
| 2026-02-10 00:00 |
01:54:10.04 |
+16:49:46.6 |
HIP 8816 |
18.57 |
| 2026-02-10 12:00 |
01:54:18.30 |
+16:50:25.5 |
HIP 8816 |
19.44 |
| 2026-02-11 00:00 |
01:54:26.65 |
+16:51:04.8 |
HIP 8816 |
20.49 |
| 2026-02-11 12:00 |
01:54:35.10 |
+16:51:44.7 |
HIP 8816 |
21.72 |
| 2026-02-12 00:00 |
01:54:43.65 |
+16:52:25.2 |
HIP 8968 |
22.09 |
| 2026-02-12 12:00 |
01:54:52.29 |
+16:53:06.2 |
HIP 8968 |
20.49 |
| 2026-02-13 00:00 |
01:55:01.03 |
+16:53:47.8 |
HIP 8968 |
18.99 |
| 2026-02-13 12:00 |
01:55:09.87 |
+16:54:29.9 |
HIP 8968 |
17.62 |
| 2026-02-14 00:00 |
01:55:18.80 |
+16:55:12.6 |
HIP 8968 |
16.42 |
| 2026-02-14 12:00 |
01:55:27.82 |
+16:55:55.8 |
HIP 8968 |
15.45 |
| 2026-02-15 00:00 |
01:55:36.93 |
+16:56:39.5 |
HIP 8968 |
14.77 |
| 2026-02-15 12:00 |
01:55:46.14 |
+16:57:23.8 |
HIP 8968 |
14.42 |
| 2026-02-16 00:00 |
01:55:55.44 |
+16:58:08.6 |
HIP 8968 |
14.44 |
| 2026-02-16 12:00 |
01:56:04.83 |
+16:58:54.0 |
HIP 8968 |
14.83 |
| 2026-02-17 00:00 |
01:56:14.31 |
+16:59:39.8 |
HIP 8968 |
15.59 |
| 2026-02-17 12:00 |
01:56:23.89 |
+17:00:26.2 |
HIP 8968 |
16.67 |
| 2026-02-18 00:00 |
01:56:33.55 |
+17:01:13.1 |
HIP 8968 |
18.03 |
| 2026-02-18 12:00 |
01:56:43.30 |
+17:02:00.6 |
HIP 8968 |
19.61 |
| 2026-02-19 00:00 |
01:56:53.14 |
+17:02:48.5 |
HIP 8968 |
21.37 |
| 2026-02-19 12:00 |
01:57:03.07 |
+17:03:36.9 |
HIP 8968 |
23.28 |
| 2026-02-20 00:00 |
01:57:13.09 |
+17:04:25.9 |
HIP 9240 |
22.73 |
| 2026-02-20 12:00 |
01:57:23.19 |
+17:05:15.4 |
HIP 9240 |
20.47 |
| 2026-02-21 00:00 |
01:57:33.38 |
+17:06:05.3 |
HIP 9240 |
18.27 |
| 2026-02-21 12:00 |
01:57:43.65 |
+17:06:55.8 |
HIP 9240 |
16.16 |
| 2026-02-22 00:00 |
01:57:54.01 |
+17:07:46.7 |
HIP 9240 |
14.20 |
| 2026-02-22 12:00 |
01:58:04.46 |
+17:08:38.2 |
HIP 9240 |
12.47 |
| 2026-02-23 00:00 |
01:58:14.99 |
+17:09:30.1 |
HIP 9240 |
11.10 |
| 2026-02-23 12:00 |
01:58:25.60 |
+17:10:22.5 |
HIP 9240 |
10.25 |
| 2026-02-24 00:00 |
01:58:36.29 |
+17:11:15.4 |
HIP 9240 |
10.06 |