| Parameter |
Value |
| Designation |
388P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-07-22T08:53:19.518720Z |
| Orbit solution date (soln_date, UTC) |
2021-09-20T00:13:09Z |
| Obs used |
133 |
| NEO |
- |
| M1 |
10.900 |
| K1 |
18.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-07-13.0000000 |
| e |
0.61889291 |
| q (au) |
1.996757 |
| a (au) |
5.239360 |
| i (deg) |
23.880476 |
| Ω (om, deg) |
37.155097 |
| ω (w, deg) |
42.471541 |
| M (ma, deg) |
209.162134 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.376 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.376 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| 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 |
17:09:35.63 |
-41:43:30.2 |
HIP 83846 |
16.45 |
| 2026-09-20 12:00 |
17:09:42.39 |
-41:42:43.1 |
HIP 83846 |
17.73 |
| 2026-09-21 00:00 |
17:09:49.30 |
-41:41:56.3 |
HIP 83846 |
19.06 |
| 2026-09-21 12:00 |
17:09:56.36 |
-41:41:09.8 |
HIP 83846 |
20.45 |
| 2026-09-22 00:00 |
17:10:03.55 |
-41:40:23.6 |
HIP 83846 |
21.88 |
| 2026-09-22 12:00 |
17:10:10.89 |
-41:39:37.7 |
HIP 83846 |
23.35 |
| 2026-09-23 00:00 |
17:10:18.37 |
-41:38:52.1 |
HIP 83846 |
24.86 |
| 2026-09-23 12:00 |
17:10:26.00 |
-41:38:06.8 |
HIP 83845 |
26.26 |
| 2026-09-24 00:00 |
17:10:33.76 |
-41:37:21.9 |
HIP 84204 |
25.73 |
| 2026-09-24 12:00 |
17:10:41.66 |
-41:36:37.2 |
HIP 84204 |
24.12 |
| 2026-09-25 00:00 |
17:10:49.71 |
-41:35:52.8 |
HIP 84204 |
22.48 |
| 2026-09-25 12:00 |
17:10:57.89 |
-41:35:08.8 |
HIP 84204 |
20.82 |
| 2026-09-26 00:00 |
17:11:06.21 |
-41:34:25.0 |
HIP 84204 |
19.15 |
| 2026-09-26 12:00 |
17:11:14.66 |
-41:33:41.6 |
HIP 84204 |
17.46 |
| 2026-09-27 00:00 |
17:11:23.26 |
-41:32:58.5 |
HIP 84204 |
15.75 |
| 2026-09-27 12:00 |
17:11:31.98 |
-41:32:15.6 |
HIP 84204 |
14.04 |
| 2026-09-28 00:00 |
17:11:40.85 |
-41:31:33.2 |
HIP 84204 |
12.32 |
| 2026-09-28 12:00 |
17:11:49.85 |
-41:30:51.0 |
HIP 84204 |
10.60 |
| 2026-09-29 00:00 |
17:11:58.98 |
-41:30:09.1 |
HIP 84204 |
8.90 |
| 2026-09-29 12:00 |
17:12:08.25 |
-41:29:27.6 |
HIP 84204 |
7.24 |
| 2026-09-30 00:00 |
17:12:17.65 |
-41:28:46.4 |
HIP 84204 |
5.68 |
| 2026-09-30 12:00 |
17:12:27.18 |
-41:28:05.5 |
HIP 84204 |
4.37 |
| 2026-10-01 00:00 |
17:12:36.84 |
-41:27:24.9 |
HIP 84204 |
3.62 |
| 2026-10-01 12:00 |
17:12:46.64 |
-41:26:44.7 |
HIP 84204 |
3.82 |
| 2026-10-02 00:00 |
17:12:56.56 |
-41:26:04.8 |
HIP 84204 |
4.87 |
| 2026-10-02 12:00 |
17:13:06.62 |
-41:25:25.2 |
HIP 84204 |
6.38 |
| 2026-10-03 00:00 |
17:13:16.80 |
-41:24:45.9 |
HIP 84204 |
8.12 |
| 2026-10-03 12:00 |
17:13:27.12 |
-41:24:07.0 |
HIP 84204 |
9.98 |
| 2026-10-04 00:00 |
17:13:37.56 |
-41:23:28.4 |
HIP 84334 |
11.00 |
| 2026-10-04 12:00 |
17:13:48.13 |
-41:22:50.1 |
HIP 84334 |
9.63 |
| 2026-10-05 00:00 |
17:13:58.83 |
-41:22:12.1 |
HIP 84334 |
8.53 |
| 2026-10-05 12:00 |
17:14:09.65 |
-41:21:34.5 |
HIP 84334 |
7.83 |
| 2026-10-06 00:00 |
17:14:20.61 |
-41:20:57.2 |
HIP 84334 |
7.66 |
| 2026-10-06 12:00 |
17:14:31.68 |
-41:20:20.3 |
HIP 84334 |
8.08 |
| 2026-10-07 00:00 |
17:14:42.88 |
-41:19:43.7 |
HIP 84334 |
9.01 |
| 2026-10-07 12:00 |
17:14:54.21 |
-41:19:07.4 |
HIP 84334 |
10.33 |
| 2026-10-08 00:00 |
17:15:05.65 |
-41:18:31.4 |
HIP 84334 |
11.93 |
| 2026-10-08 12:00 |
17:15:17.22 |
-41:17:55.8 |
HIP 84463 |
9.87 |
| 2026-10-09 00:00 |
17:15:28.92 |
-41:17:20.6 |
HIP 84463 |
7.65 |
| 2026-10-09 12:00 |
17:15:40.73 |
-41:16:45.6 |
HIP 84463 |
5.48 |
| 2026-10-10 00:00 |
17:15:52.66 |
-41:16:11.0 |
HIP 84463 |
3.46 |
| 2026-10-10 12:00 |
17:16:04.72 |
-41:15:36.8 |
HIP 84463 |
2.15 |
| 2026-10-11 00:00 |
17:16:16.89 |
-41:15:02.9 |
HIP 84463 |
2.89 |