| 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) |
| 2026-05-12 00:00 |
14:40:00.35 |
-15:19:59.1 |
HIP 71715 |
4.50 |
| 2026-05-12 12:00 |
14:39:51.59 |
-15:19:16.0 |
HIP 71715 |
5.42 |
| 2026-05-13 00:00 |
14:39:42.85 |
-15:18:33.0 |
HIP 71715 |
6.96 |
| 2026-05-13 12:00 |
14:39:34.12 |
-15:17:50.1 |
HIP 71715 |
8.79 |
| 2026-05-14 00:00 |
14:39:25.42 |
-15:17:07.2 |
HIP 71715 |
10.77 |
| 2026-05-14 12:00 |
14:39:16.74 |
-15:16:24.5 |
HIP 71715 |
12.82 |
| 2026-05-15 00:00 |
14:39:08.09 |
-15:15:41.8 |
HIP 71715 |
14.91 |
| 2026-05-15 12:00 |
14:38:59.46 |
-15:14:59.2 |
HIP 71715 |
17.02 |
| 2026-05-16 00:00 |
14:38:50.86 |
-15:14:16.8 |
HIP 71715 |
19.15 |
| 2026-05-16 12:00 |
14:38:42.28 |
-15:13:34.4 |
HIP 71567 |
17.87 |
| 2026-05-17 00:00 |
14:38:33.73 |
-15:12:52.2 |
HIP 71567 |
16.46 |
| 2026-05-17 12:00 |
14:38:25.21 |
-15:12:10.1 |
HIP 71567 |
15.23 |
| 2026-05-18 00:00 |
14:38:16.73 |
-15:11:28.1 |
HIP 71567 |
14.23 |
| 2026-05-18 12:00 |
14:38:08.27 |
-15:10:46.3 |
HIP 71567 |
13.51 |
| 2026-05-19 00:00 |
14:37:59.85 |
-15:10:04.5 |
HIP 71567 |
13.11 |
| 2026-05-19 12:00 |
14:37:51.46 |
-15:09:23.0 |
HIP 71567 |
13.06 |
| 2026-05-20 00:00 |
14:37:43.11 |
-15:08:41.6 |
HIP 71567 |
13.35 |
| 2026-05-20 12:00 |
14:37:34.79 |
-15:08:00.3 |
HIP 71567 |
13.96 |
| 2026-05-21 00:00 |
14:37:26.51 |
-15:07:19.2 |
HIP 71567 |
14.84 |
| 2026-05-21 12:00 |
14:37:18.27 |
-15:06:38.2 |
HIP 71567 |
15.96 |
| 2026-05-22 00:00 |
14:37:10.06 |
-15:05:57.5 |
HIP 71567 |
17.25 |
| 2026-05-22 12:00 |
14:37:01.90 |
-15:05:16.9 |
HIP 71567 |
18.68 |
| 2026-05-23 00:00 |
14:36:53.78 |
-15:04:36.5 |
HIP 71567 |
20.22 |
| 2026-05-23 12:00 |
14:36:45.70 |
-15:03:56.2 |
HIP 71567 |
21.83 |
| 2026-05-24 00:00 |
14:36:37.66 |
-15:03:16.2 |
HIP 71567 |
23.51 |
| 2026-05-24 12:00 |
14:36:29.67 |
-15:02:36.3 |
HIP 71567 |
25.23 |
| 2026-05-25 00:00 |
14:36:21.72 |
-15:01:56.6 |
HIP 71299 |
25.46 |
| 2026-05-25 12:00 |
14:36:13.81 |
-15:01:17.2 |
HIP 71299 |
23.50 |
| 2026-05-26 00:00 |
14:36:05.96 |
-15:00:37.9 |
HIP 71299 |
21.57 |
| 2026-05-26 12:00 |
14:35:58.15 |
-14:59:58.9 |
HIP 71299 |
19.66 |
| 2026-05-27 00:00 |
14:35:50.38 |
-14:59:20.0 |
HIP 71299 |
17.78 |
| 2026-05-27 12:00 |
14:35:42.67 |
-14:58:41.4 |
HIP 71299 |
15.94 |
| 2026-05-28 00:00 |
14:35:35.01 |
-14:58:03.0 |
HIP 71299 |
14.14 |
| 2026-05-28 12:00 |
14:35:27.39 |
-14:57:24.9 |
HIP 71299 |
12.40 |
| 2026-05-29 00:00 |
14:35:19.83 |
-14:56:46.9 |
HIP 71299 |
10.75 |
| 2026-05-29 12:00 |
14:35:12.32 |
-14:56:09.2 |
HIP 71299 |
9.22 |
| 2026-05-30 00:00 |
14:35:04.87 |
-14:55:31.8 |
HIP 71299 |
7.86 |
| 2026-05-30 12:00 |
14:34:57.47 |
-14:54:54.5 |
HIP 71299 |
6.78 |
| 2026-05-31 00:00 |
14:34:50.12 |
-14:54:17.6 |
HIP 71299 |
6.12 |
| 2026-05-31 12:00 |
14:34:42.83 |
-14:53:40.9 |
HIP 71299 |
5.99 |
| 2026-06-01 00:00 |
14:34:35.59 |
-14:53:04.4 |
HIP 71299 |
6.43 |
| 2026-06-01 12:00 |
14:34:28.41 |
-14:52:28.2 |
HIP 71299 |
7.31 |
| 2026-06-02 00:00 |
14:34:21.29 |
-14:51:52.2 |
HIP 71299 |
8.49 |