| Parameter |
Value |
| Designation |
C/2009 K4 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-06-19T09:14:16.163520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
125 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-06-09.0000000 |
| e |
0.96252699 |
| q (au) |
1.548875 |
| a (au) |
41.333073 |
| i (deg) |
34.824991 |
| Ω (om, deg) |
30.125128 |
| ω (w, deg) |
127.471471 |
| M (ma, deg) |
359.961482 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.554 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.554 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-09-20 00:00 |
22:29:17.37 |
-46:07:35.2 |
HIP 111052 |
6.73 |
| 2026-09-20 12:00 |
22:29:13.01 |
-46:07:35.7 |
HIP 111052 |
7.41 |
| 2026-09-21 00:00 |
22:29:08.66 |
-46:07:35.9 |
HIP 111052 |
8.10 |
| 2026-09-21 12:00 |
22:29:04.33 |
-46:07:35.7 |
HIP 111052 |
8.80 |
| 2026-09-22 00:00 |
22:29:00.02 |
-46:07:35.2 |
HIP 111052 |
9.50 |
| 2026-09-22 12:00 |
22:28:55.73 |
-46:07:34.4 |
HIP 111052 |
10.20 |
| 2026-09-23 00:00 |
22:28:51.46 |
-46:07:33.2 |
HIP 111052 |
10.90 |
| 2026-09-23 12:00 |
22:28:47.20 |
-46:07:31.8 |
HIP 111052 |
11.60 |
| 2026-09-24 00:00 |
22:28:42.97 |
-46:07:30.0 |
HIP 111052 |
12.31 |
| 2026-09-24 12:00 |
22:28:38.76 |
-46:07:27.8 |
HIP 111052 |
13.01 |
| 2026-09-25 00:00 |
22:28:34.56 |
-46:07:25.4 |
HIP 111052 |
13.71 |
| 2026-09-25 12:00 |
22:28:30.39 |
-46:07:22.6 |
HIP 111052 |
14.41 |
| 2026-09-26 00:00 |
22:28:26.24 |
-46:07:19.5 |
HIP 111052 |
15.10 |
| 2026-09-26 12:00 |
22:28:22.11 |
-46:07:16.1 |
HIP 111052 |
15.80 |
| 2026-09-27 00:00 |
22:28:18.00 |
-46:07:12.4 |
HIP 111052 |
16.49 |
| 2026-09-27 12:00 |
22:28:13.91 |
-46:07:08.3 |
HIP 111052 |
17.18 |
| 2026-09-28 00:00 |
22:28:09.85 |
-46:07:03.9 |
HIP 111052 |
17.86 |
| 2026-09-28 12:00 |
22:28:05.80 |
-46:06:59.2 |
HIP 110762 |
17.95 |
| 2026-09-29 00:00 |
22:28:01.78 |
-46:06:54.2 |
HIP 110762 |
17.26 |
| 2026-09-29 12:00 |
22:27:57.79 |
-46:06:48.9 |
HIP 110762 |
16.58 |
| 2026-09-30 00:00 |
22:27:53.81 |
-46:06:43.2 |
HIP 110762 |
15.90 |
| 2026-09-30 12:00 |
22:27:49.87 |
-46:06:37.2 |
HIP 110762 |
15.23 |
| 2026-10-01 00:00 |
22:27:45.94 |
-46:06:30.9 |
HIP 110762 |
14.57 |
| 2026-10-01 12:00 |
22:27:42.04 |
-46:06:24.3 |
HIP 110762 |
13.91 |
| 2026-10-02 00:00 |
22:27:38.17 |
-46:06:17.4 |
HIP 110762 |
13.26 |
| 2026-10-02 12:00 |
22:27:34.32 |
-46:06:10.1 |
HIP 110762 |
12.63 |
| 2026-10-03 00:00 |
22:27:30.49 |
-46:06:02.5 |
HIP 110762 |
12.00 |
| 2026-10-03 12:00 |
22:27:26.69 |
-46:05:54.6 |
HIP 110762 |
11.38 |
| 2026-10-04 00:00 |
22:27:22.92 |
-46:05:46.4 |
HIP 110762 |
10.77 |
| 2026-10-04 12:00 |
22:27:19.18 |
-46:05:37.9 |
HIP 110762 |
10.18 |
| 2026-10-05 00:00 |
22:27:15.46 |
-46:05:29.0 |
HIP 110762 |
9.60 |
| 2026-10-05 12:00 |
22:27:11.77 |
-46:05:19.9 |
HIP 110762 |
9.04 |
| 2026-10-06 00:00 |
22:27:08.10 |
-46:05:10.4 |
HIP 110762 |
8.50 |
| 2026-10-06 12:00 |
22:27:04.47 |
-46:05:00.6 |
HIP 110762 |
7.98 |
| 2026-10-07 00:00 |
22:27:00.86 |
-46:04:50.5 |
HIP 110762 |
7.49 |
| 2026-10-07 12:00 |
22:26:57.28 |
-46:04:40.1 |
HIP 110762 |
7.04 |
| 2026-10-08 00:00 |
22:26:53.73 |
-46:04:29.4 |
HIP 110762 |
6.62 |
| 2026-10-08 12:00 |
22:26:50.21 |
-46:04:18.3 |
HIP 110762 |
6.24 |
| 2026-10-09 00:00 |
22:26:46.72 |
-46:04:07.0 |
HIP 110762 |
5.92 |
| 2026-10-09 12:00 |
22:26:43.26 |
-46:03:55.3 |
HIP 110762 |
5.66 |
| 2026-10-10 00:00 |
22:26:39.83 |
-46:03:43.3 |
HIP 110762 |
5.47 |
| 2026-10-10 12:00 |
22:26:36.42 |
-46:03:31.1 |
HIP 110762 |
5.35 |
| 2026-10-11 00:00 |
22:26:33.05 |
-46:03:18.5 |
HIP 110762 |
5.31 |