| 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 |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
17:52:01.05 |
-43:17:00.6 |
HIP 87452 |
4.87 |
| 2026-05-12 12:00 |
17:51:48.78 |
-43:17:59.9 |
HIP 87452 |
6.67 |
| 2026-05-13 00:00 |
17:51:36.38 |
-43:18:58.6 |
HIP 87452 |
8.80 |
| 2026-05-13 12:00 |
17:51:23.85 |
-43:19:56.8 |
HIP 87452 |
11.07 |
| 2026-05-14 00:00 |
17:51:11.19 |
-43:20:54.4 |
HIP 87452 |
13.43 |
| 2026-05-14 12:00 |
17:50:58.41 |
-43:21:51.4 |
HIP 87452 |
15.84 |
| 2026-05-15 00:00 |
17:50:45.49 |
-43:22:47.9 |
HIP 87253 |
16.50 |
| 2026-05-15 12:00 |
17:50:32.45 |
-43:23:43.7 |
HIP 87253 |
14.23 |
| 2026-05-16 00:00 |
17:50:19.29 |
-43:24:38.9 |
HIP 87253 |
12.08 |
| 2026-05-16 12:00 |
17:50:06.00 |
-43:25:33.6 |
HIP 87253 |
10.12 |
| 2026-05-17 00:00 |
17:49:52.59 |
-43:26:27.6 |
HIP 87253 |
8.49 |
| 2026-05-17 12:00 |
17:49:39.07 |
-43:27:21.0 |
HIP 87253 |
7.46 |
| 2026-05-18 00:00 |
17:49:25.42 |
-43:28:13.7 |
HIP 87253 |
7.27 |
| 2026-05-18 12:00 |
17:49:11.66 |
-43:29:05.8 |
HIP 87253 |
8.02 |
| 2026-05-19 00:00 |
17:48:57.79 |
-43:29:57.3 |
HIP 87253 |
9.50 |
| 2026-05-19 12:00 |
17:48:43.80 |
-43:30:48.1 |
HIP 87125 |
8.73 |
| 2026-05-20 00:00 |
17:48:29.70 |
-43:31:38.2 |
HIP 87125 |
7.16 |
| 2026-05-20 12:00 |
17:48:15.49 |
-43:32:27.7 |
HIP 87125 |
6.38 |
| 2026-05-21 00:00 |
17:48:01.18 |
-43:33:16.5 |
HIP 87125 |
6.67 |
| 2026-05-21 12:00 |
17:47:46.75 |
-43:34:04.6 |
HIP 87125 |
7.95 |
| 2026-05-22 00:00 |
17:47:32.23 |
-43:34:52.0 |
HIP 87033 |
8.15 |
| 2026-05-22 12:00 |
17:47:17.60 |
-43:35:38.7 |
HIP 87033 |
7.02 |
| 2026-05-23 00:00 |
17:47:02.87 |
-43:36:24.8 |
HIP 87033 |
6.87 |
| 2026-05-23 12:00 |
17:46:48.04 |
-43:37:10.1 |
HIP 87033 |
7.77 |
| 2026-05-24 00:00 |
17:46:33.12 |
-43:37:54.7 |
HIP 87033 |
9.44 |
| 2026-05-24 12:00 |
17:46:18.10 |
-43:38:38.5 |
HIP 86905 |
9.50 |
| 2026-05-25 00:00 |
17:46:02.98 |
-43:39:21.7 |
HIP 86905 |
7.13 |
| 2026-05-25 12:00 |
17:45:47.77 |
-43:40:04.1 |
HIP 86905 |
5.21 |
| 2026-05-26 00:00 |
17:45:32.48 |
-43:40:45.7 |
HIP 86905 |
4.41 |
| 2026-05-26 12:00 |
17:45:17.09 |
-43:41:26.7 |
HIP 86905 |
5.29 |
| 2026-05-27 00:00 |
17:45:01.62 |
-43:42:06.8 |
HIP 86905 |
7.27 |
| 2026-05-27 12:00 |
17:44:46.07 |
-43:42:46.2 |
HIP 86905 |
9.72 |
| 2026-05-28 00:00 |
17:44:30.43 |
-43:43:24.9 |
HIP 86905 |
12.36 |
| 2026-05-28 12:00 |
17:44:14.71 |
-43:44:02.8 |
HIP 86905 |
15.11 |
| 2026-05-29 00:00 |
17:43:58.91 |
-43:44:39.9 |
HIP 86905 |
17.91 |
| 2026-05-29 12:00 |
17:43:43.03 |
-43:45:16.3 |
HIP 86905 |
20.75 |
| 2026-05-30 00:00 |
17:43:27.08 |
-43:45:51.8 |
HIP 86615 |
22.35 |
| 2026-05-30 12:00 |
17:43:11.05 |
-43:46:26.6 |
HIP 86615 |
19.92 |
| 2026-05-31 00:00 |
17:42:54.95 |
-43:47:00.6 |
HIP 86615 |
17.65 |
| 2026-05-31 12:00 |
17:42:38.78 |
-43:47:33.8 |
HIP 86615 |
15.62 |
| 2026-06-01 00:00 |
17:42:22.55 |
-43:48:06.2 |
HIP 86615 |
13.94 |
| 2026-06-01 12:00 |
17:42:06.24 |
-43:48:37.8 |
HIP 86615 |
12.76 |
| 2026-06-02 00:00 |
17:41:49.88 |
-43:49:08.6 |
HIP 86615 |
12.21 |