| Parameter |
Value |
| Designation |
406P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-08-26T19:45:19.710720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:45Z |
| Obs used |
193 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
17.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-05-14.0000000 |
| e |
0.57404352 |
| q (au) |
1.465341 |
| a (au) |
3.440120 |
| i (deg) |
1.433950 |
| Ω (om, deg) |
8.807182 |
| ω (w, deg) |
353.070367 |
| M (ma, deg) |
96.725441 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.458\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.458 |
| gf |
1.000 |
| gb |
-0.970 |
| k |
1.000 |
| 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 |
15:58:48.92 |
-21:34:34.3 |
HIP 78233 |
11.46 |
| 2026-09-20 12:00 |
15:59:22.38 |
-21:36:04.1 |
HIP 78233 |
17.22 |
| 2026-09-21 00:00 |
15:59:56.07 |
-21:37:34.2 |
HIP 78233 |
24.28 |
| 2026-09-21 12:00 |
16:00:29.98 |
-21:39:04.4 |
HIP 78530 |
27.99 |
| 2026-09-22 00:00 |
16:01:04.12 |
-21:40:34.9 |
HIP 78530 |
21.79 |
| 2026-09-22 12:00 |
16:01:38.48 |
-21:42:05.6 |
HIP 78530 |
17.18 |
| 2026-09-23 00:00 |
16:02:13.06 |
-21:43:36.5 |
HIP 78530 |
15.75 |
| 2026-09-23 12:00 |
16:02:47.86 |
-21:45:07.5 |
HIP 78530 |
18.31 |
| 2026-09-24 00:00 |
16:03:22.89 |
-21:46:38.8 |
HIP 78708 |
12.95 |
| 2026-09-24 12:00 |
16:03:58.13 |
-21:48:10.2 |
HIP 78708 |
7.56 |
| 2026-09-25 00:00 |
16:04:33.60 |
-21:49:41.7 |
HIP 78708 |
9.26 |
| 2026-09-25 12:00 |
16:05:09.28 |
-21:51:13.3 |
HIP 78847 |
7.97 |
| 2026-09-26 00:00 |
16:05:45.18 |
-21:52:45.1 |
HIP 78847 |
2.46 |
| 2026-09-26 12:00 |
16:06:21.29 |
-21:54:17.0 |
HIP 78937 |
7.41 |
| 2026-09-27 00:00 |
16:06:57.62 |
-21:55:49.0 |
HIP 78937 |
4.24 |
| 2026-09-27 12:00 |
16:07:34.17 |
-21:57:21.1 |
HIP 78977 |
7.32 |
| 2026-09-28 00:00 |
16:08:10.93 |
-21:58:53.2 |
HIP 78977 |
13.19 |
| 2026-09-28 12:00 |
16:08:47.91 |
-22:00:25.5 |
HIP 79146 |
7.42 |
| 2026-09-29 00:00 |
16:09:25.09 |
-22:01:57.8 |
HIP 79146 |
5.98 |
| 2026-09-29 12:00 |
16:10:02.50 |
-22:03:30.1 |
HIP 79244 |
7.16 |
| 2026-09-30 00:00 |
16:10:40.11 |
-22:05:02.5 |
HIP 79244 |
6.41 |
| 2026-09-30 12:00 |
16:11:17.93 |
-22:06:34.8 |
HIP 79252 |
13.45 |
| 2026-10-01 00:00 |
16:11:55.97 |
-22:08:07.2 |
HIP 79252 |
20.94 |
| 2026-10-01 12:00 |
16:12:34.22 |
-22:09:39.7 |
HIP 79476 |
21.28 |
| 2026-10-02 00:00 |
16:13:12.68 |
-22:11:12.1 |
HIP 79476 |
17.91 |
| 2026-10-02 12:00 |
16:13:51.34 |
-22:12:44.4 |
HIP 79621 |
17.52 |
| 2026-10-03 00:00 |
16:14:30.22 |
-22:14:16.8 |
HIP 79621 |
10.07 |
| 2026-10-03 12:00 |
16:15:09.31 |
-22:15:49.1 |
HIP 79621 |
7.91 |
| 2026-10-04 00:00 |
16:15:48.60 |
-22:17:21.3 |
HIP 79644 |
13.48 |
| 2026-10-04 12:00 |
16:16:28.10 |
-22:18:53.5 |
HIP 79644 |
21.46 |
| 2026-10-05 00:00 |
16:17:07.81 |
-22:20:25.6 |
HIP 79839 |
27.93 |
| 2026-10-05 12:00 |
16:17:47.72 |
-22:21:57.7 |
HIP 79931 |
27.89 |
| 2026-10-06 00:00 |
16:18:27.84 |
-22:23:29.6 |
HIP 79931 |
22.82 |
| 2026-10-06 12:00 |
16:19:08.17 |
-22:25:01.4 |
HIP 79931 |
20.97 |
| 2026-10-07 00:00 |
16:19:48.70 |
-22:26:33.1 |
HIP 80088 |
16.87 |
| 2026-10-07 12:00 |
16:20:29.44 |
-22:28:04.7 |
HIP 80088 |
8.96 |
| 2026-10-08 00:00 |
16:21:10.37 |
-22:29:36.1 |
HIP 80088 |
7.62 |
| 2026-10-08 12:00 |
16:21:51.52 |
-22:31:07.4 |
HIP 80088 |
14.85 |
| 2026-10-09 00:00 |
16:22:32.86 |
-22:32:38.4 |
HIP 80088 |
23.88 |
| 2026-10-09 12:00 |
16:23:14.40 |
-22:34:09.3 |
HIP 80374 |
17.10 |
| 2026-10-10 00:00 |
16:23:56.15 |
-22:35:40.1 |
HIP 80374 |
7.60 |
| 2026-10-10 12:00 |
16:24:38.09 |
-22:37:10.6 |
HIP 80374 |
3.67 |
| 2026-10-11 00:00 |
16:25:20.24 |
-22:38:40.9 |
HIP 80374 |
12.74 |