P/2011 S1 (Gibbs)
| 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) |
| 2026-02-03 00:00 |
14:54:35.50 |
-16:34:20.3 |
HIP 72947 |
10.85 |
| 2026-02-03 12:00 |
14:54:39.25 |
-16:34:33.9 |
HIP 72947 |
11.22 |
| 2026-02-04 00:00 |
14:54:42.91 |
-16:34:47.1 |
HIP 72947 |
11.63 |
| 2026-02-04 12:00 |
14:54:46.48 |
-16:34:59.8 |
HIP 72947 |
12.08 |
| 2026-02-05 00:00 |
14:54:49.94 |
-16:35:12.2 |
HIP 72947 |
12.57 |
| 2026-02-05 12:00 |
14:54:53.32 |
-16:35:24.1 |
HIP 72947 |
13.07 |
| 2026-02-06 00:00 |
14:54:56.59 |
-16:35:35.6 |
HIP 72947 |
13.59 |
| 2026-02-06 12:00 |
14:54:59.77 |
-16:35:46.7 |
HIP 72947 |
14.12 |
| 2026-02-07 00:00 |
14:55:02.86 |
-16:35:57.4 |
HIP 72947 |
14.66 |
| 2026-02-07 12:00 |
14:55:05.84 |
-16:36:07.6 |
HIP 72947 |
15.19 |
| 2026-02-08 00:00 |
14:55:08.73 |
-16:36:17.4 |
HIP 72947 |
15.73 |
| 2026-02-08 12:00 |
14:55:11.52 |
-16:36:26.7 |
HIP 72947 |
16.25 |
| 2026-02-09 00:00 |
14:55:14.22 |
-16:36:35.7 |
HIP 72947 |
16.77 |
| 2026-02-09 12:00 |
14:55:16.81 |
-16:36:44.2 |
HIP 72947 |
17.27 |
| 2026-02-10 00:00 |
14:55:19.31 |
-16:36:52.3 |
HIP 72947 |
17.77 |
| 2026-02-10 12:00 |
14:55:21.71 |
-16:37:00.0 |
HIP 73097 |
17.76 |
| 2026-02-11 00:00 |
14:55:24.01 |
-16:37:07.2 |
HIP 73097 |
17.26 |
| 2026-02-11 12:00 |
14:55:26.21 |
-16:37:13.9 |
HIP 73097 |
16.78 |
| 2026-02-12 00:00 |
14:55:28.32 |
-16:37:20.3 |
HIP 73097 |
16.33 |
| 2026-02-12 12:00 |
14:55:30.32 |
-16:37:26.2 |
HIP 73097 |
15.91 |
| 2026-02-13 00:00 |
14:55:32.22 |
-16:37:31.7 |
HIP 73097 |
15.51 |
| 2026-02-13 12:00 |
14:55:34.03 |
-16:37:36.8 |
HIP 73097 |
15.13 |
| 2026-02-14 00:00 |
14:55:35.73 |
-16:37:41.4 |
HIP 73097 |
14.79 |
| 2026-02-14 12:00 |
14:55:37.34 |
-16:37:45.6 |
HIP 73097 |
14.46 |
| 2026-02-15 00:00 |
14:55:38.84 |
-16:37:49.3 |
HIP 73097 |
14.17 |
| 2026-02-15 12:00 |
14:55:40.24 |
-16:37:52.6 |
HIP 73097 |
13.90 |
| 2026-02-16 00:00 |
14:55:41.55 |
-16:37:55.5 |
HIP 73097 |
13.65 |
| 2026-02-16 12:00 |
14:55:42.75 |
-16:37:58.0 |
HIP 73097 |
13.43 |
| 2026-02-17 00:00 |
14:55:43.86 |
-16:38:00.0 |
HIP 73097 |
13.23 |
| 2026-02-17 12:00 |
14:55:44.86 |
-16:38:01.5 |
HIP 73097 |
13.05 |
| 2026-02-18 00:00 |
14:55:45.76 |
-16:38:02.7 |
HIP 73097 |
12.90 |
| 2026-02-18 12:00 |
14:55:46.56 |
-16:38:03.4 |
HIP 73097 |
12.77 |
| 2026-02-19 00:00 |
14:55:47.26 |
-16:38:03.6 |
HIP 73097 |
12.66 |
| 2026-02-19 12:00 |
14:55:47.87 |
-16:38:03.5 |
HIP 73097 |
12.58 |
| 2026-02-20 00:00 |
14:55:48.37 |
-16:38:02.8 |
HIP 73097 |
12.51 |
| 2026-02-20 12:00 |
14:55:48.77 |
-16:38:01.8 |
HIP 73097 |
12.47 |
| 2026-02-21 00:00 |
14:55:49.06 |
-16:38:00.3 |
HIP 73097 |
12.45 |
| 2026-02-21 12:00 |
14:55:49.26 |
-16:37:58.4 |
HIP 73097 |
12.45 |
| 2026-02-22 00:00 |
14:55:49.36 |
-16:37:56.1 |
HIP 73097 |
12.46 |
| 2026-02-22 12:00 |
14:55:49.36 |
-16:37:53.3 |
HIP 73097 |
12.50 |
| 2026-02-23 00:00 |
14:55:49.26 |
-16:37:50.1 |
HIP 73097 |
12.56 |
| 2026-02-23 12:00 |
14:55:49.06 |
-16:37:46.4 |
HIP 73097 |
12.64 |
| 2026-02-24 00:00 |
14:55:48.76 |
-16:37:42.4 |
HIP 73097 |
12.73 |