| Parameter |
Value |
| Designation |
P/2011 S1 (Gibbs) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-08-24T00:44:05.058240Z |
| Orbit solution date (soln_date, UTC) |
2022-04-30T03:13:22Z |
| Obs used |
148 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-06-05.0000000 |
| e |
0.20315224 |
| q (au) |
6.894034 |
| a (au) |
8.651632 |
| i (deg) |
2.679391 |
| Ω (om, deg) |
218.895891 |
| ω (w, deg) |
193.367451 |
| M (ma, deg) |
342.763587 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.792 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.792 |
| n |
6.000 |
| gf |
0.941 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
8.160 |
| 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) |
| 2026-03-26 00:00 |
14:52:37.00 |
-16:21:00.7 |
HIP 72784 |
2.89 |
| 2026-03-26 12:00 |
14:52:31.15 |
-16:20:32.3 |
HIP 72784 |
3.80 |
| 2026-03-27 00:00 |
14:52:25.22 |
-16:20:03.6 |
HIP 72784 |
5.02 |
| 2026-03-27 12:00 |
14:52:19.22 |
-16:19:34.5 |
HIP 72784 |
6.37 |
| 2026-03-28 00:00 |
14:52:13.15 |
-16:19:05.0 |
HIP 72784 |
7.80 |
| 2026-03-28 12:00 |
14:52:07.01 |
-16:18:35.3 |
HIP 72784 |
9.28 |
| 2026-03-29 00:00 |
14:52:00.79 |
-16:18:05.2 |
HIP 72784 |
10.80 |
| 2026-03-29 12:00 |
14:51:54.51 |
-16:17:34.8 |
HIP 72784 |
12.35 |
| 2026-03-30 00:00 |
14:51:48.15 |
-16:17:04.1 |
HIP 72784 |
13.93 |
| 2026-03-30 12:00 |
14:51:41.72 |
-16:16:33.0 |
HIP 72784 |
15.53 |
| 2026-03-31 00:00 |
14:51:35.23 |
-16:16:01.7 |
HIP 72622 |
16.94 |
| 2026-03-31 12:00 |
14:51:28.66 |
-16:15:30.0 |
HIP 72622 |
15.60 |
| 2026-04-01 00:00 |
14:51:22.03 |
-16:14:58.0 |
HIP 72622 |
14.31 |
| 2026-04-01 12:00 |
14:51:15.34 |
-16:14:25.7 |
HIP 72622 |
13.10 |
| 2026-04-02 00:00 |
14:51:08.58 |
-16:13:53.1 |
HIP 72622 |
12.00 |
| 2026-04-02 12:00 |
14:51:01.75 |
-16:13:20.2 |
HIP 72622 |
11.05 |
| 2026-04-03 00:00 |
14:50:54.86 |
-16:12:47.1 |
HIP 72622 |
10.30 |
| 2026-04-03 12:00 |
14:50:47.90 |
-16:12:13.6 |
HIP 72622 |
9.80 |
| 2026-04-04 00:00 |
14:50:40.89 |
-16:11:39.8 |
HIP 72622 |
9.60 |
| 2026-04-04 12:00 |
14:50:33.81 |
-16:11:05.7 |
HIP 72622 |
9.73 |
| 2026-04-05 00:00 |
14:50:26.67 |
-16:10:31.4 |
HIP 72622 |
10.19 |
| 2026-04-05 12:00 |
14:50:19.47 |
-16:09:56.8 |
HIP 72622 |
10.93 |
| 2026-04-06 00:00 |
14:50:12.22 |
-16:09:21.9 |
HIP 72603 |
11.82 |
| 2026-04-06 12:00 |
14:50:04.90 |
-16:08:46.7 |
HIP 72603 |
12.51 |
| 2026-04-07 00:00 |
14:49:57.53 |
-16:08:11.3 |
HIP 72603 |
13.43 |
| 2026-04-07 12:00 |
14:49:50.10 |
-16:07:35.6 |
HIP 72603 |
14.54 |
| 2026-04-08 00:00 |
14:49:42.62 |
-16:06:59.6 |
HIP 72603 |
15.81 |
| 2026-04-08 12:00 |
14:49:35.08 |
-16:06:23.3 |
HIP 72603 |
17.20 |
| 2026-04-09 00:00 |
14:49:27.48 |
-16:05:46.8 |
HIP 72603 |
18.70 |
| 2026-04-09 12:00 |
14:49:19.84 |
-16:05:10.1 |
HIP 72603 |
20.28 |
| 2026-04-10 00:00 |
14:49:12.14 |
-16:04:33.1 |
HIP 72603 |
21.93 |
| 2026-04-10 12:00 |
14:49:04.39 |
-16:03:55.9 |
HIP 72603 |
23.64 |
| 2026-04-11 00:00 |
14:48:56.59 |
-16:03:18.4 |
HIP 72603 |
25.39 |
| 2026-04-11 12:00 |
14:48:48.75 |
-16:02:40.7 |
HIP 72603 |
27.19 |
| 2026-04-12 00:00 |
14:48:40.85 |
-16:02:02.7 |
HIP 72603 |
29.02 |
| 2026-04-12 12:00 |
14:48:32.91 |
-16:01:24.5 |
HIP 72603 |
30.88 |
| 2026-04-13 00:00 |
14:48:24.92 |
-16:00:46.1 |
HIP 72603 |
32.78 |
| 2026-04-13 12:00 |
14:48:16.89 |
-16:00:07.5 |
HIP 72292 |
33.46 |
| 2026-04-14 00:00 |
14:48:08.81 |
-15:59:28.7 |
HIP 72292 |
33.03 |
| 2026-04-14 12:00 |
14:48:00.69 |
-15:58:49.6 |
HIP 72292 |
32.72 |
| 2026-04-15 00:00 |
14:47:52.53 |
-15:58:10.4 |
HIP 72292 |
32.54 |
| 2026-04-15 12:00 |
14:47:44.32 |
-15:57:30.9 |
HIP 72292 |
32.49 |
| 2026-04-16 00:00 |
14:47:36.08 |
-15:56:51.3 |
HIP 72292 |
32.57 |