| 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) |
| 2026-07-29 00:00 |
22:37:18.31 |
-45:38:25.9 |
HIP 111672 |
11.73 |
| 2026-07-29 12:00 |
22:37:14.32 |
-45:38:55.4 |
HIP 111672 |
11.30 |
| 2026-07-30 00:00 |
22:37:10.32 |
-45:39:24.7 |
HIP 111672 |
10.93 |
| 2026-07-30 12:00 |
22:37:06.29 |
-45:39:53.9 |
HIP 111672 |
10.61 |
| 2026-07-31 00:00 |
22:37:02.24 |
-45:40:22.8 |
HIP 111672 |
10.36 |
| 2026-07-31 12:00 |
22:36:58.16 |
-45:40:51.6 |
HIP 111672 |
10.18 |
| 2026-08-01 00:00 |
22:36:54.07 |
-45:41:20.2 |
HIP 111672 |
10.07 |
| 2026-08-01 12:00 |
22:36:49.95 |
-45:41:48.6 |
HIP 111672 |
10.05 |
| 2026-08-02 00:00 |
22:36:45.82 |
-45:42:16.8 |
HIP 111672 |
10.10 |
| 2026-08-02 12:00 |
22:36:41.66 |
-45:42:44.8 |
HIP 111672 |
10.22 |
| 2026-08-03 00:00 |
22:36:37.48 |
-45:43:12.6 |
HIP 111672 |
10.42 |
| 2026-08-03 12:00 |
22:36:33.28 |
-45:43:40.3 |
HIP 111672 |
10.70 |
| 2026-08-04 00:00 |
22:36:29.06 |
-45:44:07.7 |
HIP 111672 |
11.03 |
| 2026-08-04 12:00 |
22:36:24.82 |
-45:44:34.9 |
HIP 111672 |
11.43 |
| 2026-08-05 00:00 |
22:36:20.56 |
-45:45:01.9 |
HIP 111672 |
11.89 |
| 2026-08-05 12:00 |
22:36:16.29 |
-45:45:28.7 |
HIP 111672 |
12.39 |
| 2026-08-06 00:00 |
22:36:11.99 |
-45:45:55.4 |
HIP 111672 |
12.93 |
| 2026-08-06 12:00 |
22:36:07.68 |
-45:46:21.8 |
HIP 111672 |
13.51 |
| 2026-08-07 00:00 |
22:36:03.35 |
-45:46:47.9 |
HIP 111456 |
13.19 |
| 2026-08-07 12:00 |
22:35:59.00 |
-45:47:13.9 |
HIP 111456 |
12.43 |
| 2026-08-08 00:00 |
22:35:54.63 |
-45:47:39.7 |
HIP 111456 |
11.68 |
| 2026-08-08 12:00 |
22:35:50.25 |
-45:48:05.2 |
HIP 111456 |
10.94 |
| 2026-08-09 00:00 |
22:35:45.85 |
-45:48:30.5 |
HIP 111456 |
10.23 |
| 2026-08-09 12:00 |
22:35:41.43 |
-45:48:55.6 |
HIP 111456 |
9.54 |
| 2026-08-10 00:00 |
22:35:37.00 |
-45:49:20.4 |
HIP 111456 |
8.88 |
| 2026-08-10 12:00 |
22:35:32.55 |
-45:49:45.1 |
HIP 111456 |
8.26 |
| 2026-08-11 00:00 |
22:35:28.09 |
-45:50:09.4 |
HIP 111456 |
7.68 |
| 2026-08-11 12:00 |
22:35:23.61 |
-45:50:33.6 |
HIP 111456 |
7.16 |
| 2026-08-12 00:00 |
22:35:19.12 |
-45:50:57.5 |
HIP 111456 |
6.71 |
| 2026-08-12 12:00 |
22:35:14.61 |
-45:51:21.2 |
HIP 111456 |
6.34 |
| 2026-08-13 00:00 |
22:35:10.09 |
-45:51:44.6 |
HIP 111456 |
6.08 |
| 2026-08-13 12:00 |
22:35:05.56 |
-45:52:07.8 |
HIP 111456 |
5.93 |
| 2026-08-14 00:00 |
22:35:01.01 |
-45:52:30.8 |
HIP 111456 |
5.91 |
| 2026-08-14 12:00 |
22:34:56.46 |
-45:52:53.4 |
HIP 111456 |
6.01 |
| 2026-08-15 00:00 |
22:34:51.89 |
-45:53:15.9 |
HIP 111456 |
6.23 |
| 2026-08-15 12:00 |
22:34:47.31 |
-45:53:38.1 |
HIP 111456 |
6.56 |
| 2026-08-16 00:00 |
22:34:42.72 |
-45:54:00.0 |
HIP 111456 |
6.98 |
| 2026-08-16 12:00 |
22:34:38.11 |
-45:54:21.7 |
HIP 111456 |
7.47 |
| 2026-08-17 00:00 |
22:34:33.50 |
-45:54:43.1 |
HIP 111456 |
8.03 |
| 2026-08-17 12:00 |
22:34:28.88 |
-45:55:04.2 |
HIP 111456 |
8.64 |
| 2026-08-18 00:00 |
22:34:24.25 |
-45:55:25.1 |
HIP 111456 |
9.29 |
| 2026-08-18 12:00 |
22:34:19.61 |
-45:55:45.8 |
HIP 111456 |
9.97 |
| 2026-08-19 00:00 |
22:34:14.96 |
-45:56:06.1 |
HIP 111456 |
10.68 |