C/2009 K4 (Gibbs)
| 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) |
| 2026-02-03 00:00 |
22:27:33.04 |
-44:25:52.9 |
HIP 110765 |
15.41 |
| 2026-02-03 12:00 |
22:27:37.75 |
-44:25:24.2 |
HIP 110765 |
15.81 |
| 2026-02-04 00:00 |
22:27:42.46 |
-44:24:55.7 |
HIP 110765 |
16.26 |
| 2026-02-04 12:00 |
22:27:47.19 |
-44:24:27.4 |
HIP 110765 |
16.76 |
| 2026-02-05 00:00 |
22:27:51.93 |
-44:23:59.3 |
HIP 110765 |
17.30 |
| 2026-02-05 12:00 |
22:27:56.68 |
-44:23:31.4 |
HIP 110765 |
17.88 |
| 2026-02-06 00:00 |
22:28:01.45 |
-44:23:03.7 |
HIP 110765 |
18.50 |
| 2026-02-06 12:00 |
22:28:06.22 |
-44:22:36.2 |
HIP 110765 |
19.15 |
| 2026-02-07 00:00 |
22:28:11.01 |
-44:22:09.0 |
HIP 110765 |
19.83 |
| 2026-02-07 12:00 |
22:28:15.81 |
-44:21:41.9 |
HIP 111078 |
20.38 |
| 2026-02-08 00:00 |
22:28:20.61 |
-44:21:15.0 |
HIP 111078 |
19.56 |
| 2026-02-08 12:00 |
22:28:25.43 |
-44:20:48.4 |
HIP 111078 |
18.74 |
| 2026-02-09 00:00 |
22:28:30.26 |
-44:20:21.9 |
HIP 111078 |
17.94 |
| 2026-02-09 12:00 |
22:28:35.10 |
-44:19:55.7 |
HIP 111078 |
17.15 |
| 2026-02-10 00:00 |
22:28:39.94 |
-44:19:29.7 |
HIP 111078 |
16.38 |
| 2026-02-10 12:00 |
22:28:44.80 |
-44:19:03.9 |
HIP 111078 |
15.62 |
| 2026-02-11 00:00 |
22:28:49.66 |
-44:18:38.4 |
HIP 111078 |
14.89 |
| 2026-02-11 12:00 |
22:28:54.53 |
-44:18:13.0 |
HIP 111078 |
14.19 |
| 2026-02-12 00:00 |
22:28:59.42 |
-44:17:47.9 |
HIP 111078 |
13.51 |
| 2026-02-12 12:00 |
22:29:04.30 |
-44:17:23.0 |
HIP 111078 |
12.87 |
| 2026-02-13 00:00 |
22:29:09.20 |
-44:16:58.3 |
HIP 111078 |
12.27 |
| 2026-02-13 12:00 |
22:29:14.10 |
-44:16:33.9 |
HIP 111078 |
11.72 |
| 2026-02-14 00:00 |
22:29:19.01 |
-44:16:09.7 |
HIP 111078 |
11.22 |
| 2026-02-14 12:00 |
22:29:23.93 |
-44:15:45.7 |
HIP 111078 |
10.78 |
| 2026-02-15 00:00 |
22:29:28.85 |
-44:15:21.9 |
HIP 111078 |
10.40 |
| 2026-02-15 12:00 |
22:29:33.77 |
-44:14:58.4 |
HIP 111078 |
10.10 |
| 2026-02-16 00:00 |
22:29:38.71 |
-44:14:35.1 |
HIP 111078 |
9.88 |
| 2026-02-16 12:00 |
22:29:43.64 |
-44:14:12.1 |
HIP 111078 |
9.75 |
| 2026-02-17 00:00 |
22:29:48.58 |
-44:13:49.3 |
HIP 111078 |
9.71 |
| 2026-02-17 12:00 |
22:29:53.53 |
-44:13:26.7 |
HIP 111078 |
9.76 |
| 2026-02-18 00:00 |
22:29:58.48 |
-44:13:04.4 |
HIP 111078 |
9.90 |
| 2026-02-18 12:00 |
22:30:03.43 |
-44:12:42.4 |
HIP 111127 |
10.02 |
| 2026-02-19 00:00 |
22:30:08.39 |
-44:12:20.5 |
HIP 111127 |
9.14 |
| 2026-02-19 12:00 |
22:30:13.35 |
-44:11:59.0 |
HIP 111127 |
8.28 |
| 2026-02-20 00:00 |
22:30:18.31 |
-44:11:37.6 |
HIP 111127 |
7.45 |
| 2026-02-20 12:00 |
22:30:23.28 |
-44:11:16.5 |
HIP 111127 |
6.66 |
| 2026-02-21 00:00 |
22:30:28.24 |
-44:10:55.7 |
HIP 111127 |
5.92 |
| 2026-02-21 12:00 |
22:30:33.21 |
-44:10:35.1 |
HIP 111127 |
5.26 |
| 2026-02-22 00:00 |
22:30:38.18 |
-44:10:14.8 |
HIP 111127 |
4.70 |
| 2026-02-22 12:00 |
22:30:43.15 |
-44:09:54.7 |
HIP 111127 |
4.29 |
| 2026-02-23 00:00 |
22:30:48.12 |
-44:09:34.9 |
HIP 111127 |
4.07 |
| 2026-02-23 12:00 |
22:30:53.09 |
-44:09:15.4 |
HIP 111127 |
4.07 |
| 2026-02-24 00:00 |
22:30:58.06 |
-44:08:56.1 |
HIP 111127 |
4.29 |