C/2008 G1 (Gibbs)
| Parameter |
Value |
| Designation |
C/2008 G1 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-01-11T23:47:18.816000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:17Z |
| Obs used |
166 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-05-08.0000000 |
| e |
0.98907227 |
| q (au) |
3.989818 |
| a (au) |
365.109434 |
| i (deg) |
72.856095 |
| Ω (om, deg) |
215.916428 |
| ω (w, deg) |
63.704008 |
| M (ma, deg) |
359.964823 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.574 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.574 |
| n |
6.000 |
| gf |
0.995 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.994 |
| 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 |
03:04:39.98 |
-06:44:14.3 |
HIP 14462 |
30.23 |
| 2026-02-03 12:00 |
03:04:39.87 |
-06:43:57.1 |
HIP 14462 |
30.20 |
| 2026-02-04 00:00 |
03:04:39.79 |
-06:43:39.7 |
HIP 14462 |
30.17 |
| 2026-02-04 12:00 |
03:04:39.74 |
-06:43:22.3 |
HIP 14462 |
30.13 |
| 2026-02-05 00:00 |
03:04:39.72 |
-06:43:04.7 |
HIP 14462 |
30.09 |
| 2026-02-05 12:00 |
03:04:39.73 |
-06:42:47.0 |
HIP 14462 |
30.05 |
| 2026-02-06 00:00 |
03:04:39.77 |
-06:42:29.2 |
HIP 14462 |
30.00 |
| 2026-02-06 12:00 |
03:04:39.85 |
-06:42:11.3 |
HIP 14462 |
29.94 |
| 2026-02-07 00:00 |
03:04:39.95 |
-06:41:53.2 |
HIP 14462 |
29.88 |
| 2026-02-07 12:00 |
03:04:40.08 |
-06:41:35.1 |
HIP 14462 |
29.82 |
| 2026-02-08 00:00 |
03:04:40.24 |
-06:41:16.8 |
HIP 14462 |
29.75 |
| 2026-02-08 12:00 |
03:04:40.44 |
-06:40:58.5 |
HIP 14462 |
29.67 |
| 2026-02-09 00:00 |
03:04:40.66 |
-06:40:40.0 |
HIP 14462 |
29.59 |
| 2026-02-09 12:00 |
03:04:40.91 |
-06:40:21.4 |
HIP 14462 |
29.51 |
| 2026-02-10 00:00 |
03:04:41.20 |
-06:40:02.8 |
HIP 14462 |
29.42 |
| 2026-02-10 12:00 |
03:04:41.51 |
-06:39:44.0 |
HIP 14462 |
29.33 |
| 2026-02-11 00:00 |
03:04:41.86 |
-06:39:25.1 |
HIP 14462 |
29.23 |
| 2026-02-11 12:00 |
03:04:42.23 |
-06:39:06.1 |
HIP 14462 |
29.13 |
| 2026-02-12 00:00 |
03:04:42.63 |
-06:38:47.1 |
HIP 14462 |
29.03 |
| 2026-02-12 12:00 |
03:04:43.07 |
-06:38:27.9 |
HIP 14462 |
28.92 |
| 2026-02-13 00:00 |
03:04:43.53 |
-06:38:08.7 |
HIP 14462 |
28.81 |
| 2026-02-13 12:00 |
03:04:44.03 |
-06:37:49.3 |
HIP 14462 |
28.69 |
| 2026-02-14 00:00 |
03:04:44.55 |
-06:37:29.9 |
HIP 14462 |
28.57 |
| 2026-02-14 12:00 |
03:04:45.10 |
-06:37:10.4 |
HIP 14462 |
28.45 |
| 2026-02-15 00:00 |
03:04:45.68 |
-06:36:50.8 |
HIP 14462 |
28.32 |
| 2026-02-15 12:00 |
03:04:46.30 |
-06:36:31.1 |
HIP 14462 |
28.19 |
| 2026-02-16 00:00 |
03:04:46.94 |
-06:36:11.3 |
HIP 14462 |
28.06 |
| 2026-02-16 12:00 |
03:04:47.61 |
-06:35:51.5 |
HIP 14462 |
27.92 |
| 2026-02-17 00:00 |
03:04:48.31 |
-06:35:31.6 |
HIP 14462 |
27.79 |
| 2026-02-17 12:00 |
03:04:49.04 |
-06:35:11.6 |
HIP 14462 |
27.64 |
| 2026-02-18 00:00 |
03:04:49.80 |
-06:34:51.5 |
HIP 14462 |
27.50 |
| 2026-02-18 12:00 |
03:04:50.59 |
-06:34:31.4 |
HIP 14462 |
27.35 |
| 2026-02-19 00:00 |
03:04:51.41 |
-06:34:11.2 |
HIP 14462 |
27.20 |
| 2026-02-19 12:00 |
03:04:52.26 |
-06:33:50.9 |
HIP 14462 |
27.05 |
| 2026-02-20 00:00 |
03:04:53.14 |
-06:33:30.6 |
HIP 14462 |
26.90 |
| 2026-02-20 12:00 |
03:04:54.04 |
-06:33:10.2 |
HIP 14462 |
26.75 |
| 2026-02-21 00:00 |
03:04:54.98 |
-06:32:49.8 |
HIP 14462 |
26.59 |
| 2026-02-21 12:00 |
03:04:55.94 |
-06:32:29.2 |
HIP 14462 |
26.43 |
| 2026-02-22 00:00 |
03:04:56.93 |
-06:32:08.7 |
HIP 14462 |
26.27 |
| 2026-02-22 12:00 |
03:04:57.95 |
-06:31:48.1 |
HIP 14462 |
26.12 |
| 2026-02-23 00:00 |
03:04:59.00 |
-06:31:27.4 |
HIP 14462 |
25.96 |
| 2026-02-23 12:00 |
03:05:00.08 |
-06:31:06.7 |
HIP 14462 |
25.80 |
| 2026-02-24 00:00 |
03:05:01.18 |
-06:30:45.9 |
HIP 14462 |
25.64 |