| 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) |
| 2026-03-26 00:00 |
17:59:46.87 |
-41:21:40.7 |
HIP 88109 |
7.63 |
| 2026-03-26 12:00 |
17:59:49.42 |
-41:22:58.0 |
HIP 88109 |
6.46 |
| 2026-03-27 00:00 |
17:59:51.81 |
-41:24:15.5 |
HIP 88109 |
5.37 |
| 2026-03-27 12:00 |
17:59:54.05 |
-41:25:33.0 |
HIP 88109 |
4.43 |
| 2026-03-28 00:00 |
17:59:56.13 |
-41:26:50.6 |
HIP 88109 |
3.72 |
| 2026-03-28 12:00 |
17:59:58.06 |
-41:28:08.3 |
HIP 88109 |
3.40 |
| 2026-03-29 00:00 |
17:59:59.82 |
-41:29:26.1 |
HIP 88109 |
3.56 |
| 2026-03-29 12:00 |
18:00:01.43 |
-41:30:44.0 |
HIP 88109 |
4.14 |
| 2026-03-30 00:00 |
18:00:02.87 |
-41:32:01.9 |
HIP 88109 |
4.99 |
| 2026-03-30 12:00 |
18:00:04.16 |
-41:33:19.9 |
HIP 88109 |
5.99 |
| 2026-03-31 00:00 |
18:00:05.29 |
-41:34:37.9 |
HIP 88109 |
7.08 |
| 2026-03-31 12:00 |
18:00:06.26 |
-41:35:56.0 |
HIP 88109 |
8.22 |
| 2026-04-01 00:00 |
18:00:07.06 |
-41:37:14.2 |
HIP 88109 |
9.40 |
| 2026-04-01 12:00 |
18:00:07.71 |
-41:38:32.4 |
HIP 88109 |
10.59 |
| 2026-04-02 00:00 |
18:00:08.20 |
-41:39:50.6 |
HIP 88109 |
11.79 |
| 2026-04-02 12:00 |
18:00:08.52 |
-41:41:08.9 |
HIP 88109 |
13.00 |
| 2026-04-03 00:00 |
18:00:08.68 |
-41:42:27.2 |
HIP 88109 |
14.22 |
| 2026-04-03 12:00 |
18:00:08.68 |
-41:43:45.5 |
HIP 88109 |
15.44 |
| 2026-04-04 00:00 |
18:00:08.52 |
-41:45:03.9 |
HIP 88109 |
16.66 |
| 2026-04-04 12:00 |
18:00:08.20 |
-41:46:22.2 |
HIP 88205 |
15.88 |
| 2026-04-05 00:00 |
18:00:07.71 |
-41:47:40.6 |
HIP 88205 |
14.75 |
| 2026-04-05 12:00 |
18:00:07.06 |
-41:48:59.0 |
HIP 88205 |
13.66 |
| 2026-04-06 00:00 |
18:00:06.24 |
-41:50:17.4 |
HIP 88205 |
12.64 |
| 2026-04-06 12:00 |
18:00:05.26 |
-41:51:35.7 |
HIP 88205 |
11.70 |
| 2026-04-07 00:00 |
18:00:04.12 |
-41:52:54.1 |
HIP 88205 |
10.85 |
| 2026-04-07 12:00 |
18:00:02.81 |
-41:54:12.4 |
HIP 88205 |
10.13 |
| 2026-04-08 00:00 |
18:00:01.34 |
-41:55:30.8 |
HIP 88205 |
9.57 |
| 2026-04-08 12:00 |
17:59:59.70 |
-41:56:49.1 |
HIP 88205 |
9.20 |
| 2026-04-09 00:00 |
17:59:57.90 |
-41:58:07.3 |
HIP 88205 |
9.04 |
| 2026-04-09 12:00 |
17:59:55.93 |
-41:59:25.6 |
HIP 88205 |
9.12 |
| 2026-04-10 00:00 |
17:59:53.80 |
-42:00:43.7 |
HIP 88205 |
9.42 |
| 2026-04-10 12:00 |
17:59:51.50 |
-42:02:01.9 |
HIP 88205 |
9.93 |
| 2026-04-11 00:00 |
17:59:49.04 |
-42:03:19.9 |
HIP 88205 |
10.62 |
| 2026-04-11 12:00 |
17:59:46.41 |
-42:04:37.9 |
HIP 88205 |
11.47 |
| 2026-04-12 00:00 |
17:59:43.61 |
-42:05:55.9 |
HIP 88205 |
12.44 |
| 2026-04-12 12:00 |
17:59:40.65 |
-42:07:13.7 |
HIP 88205 |
13.51 |
| 2026-04-13 00:00 |
17:59:37.52 |
-42:08:31.5 |
HIP 88205 |
14.67 |
| 2026-04-13 12:00 |
17:59:34.22 |
-42:09:49.2 |
HIP 88135 |
15.54 |
| 2026-04-14 00:00 |
17:59:30.76 |
-42:11:06.7 |
HIP 88135 |
14.67 |
| 2026-04-14 12:00 |
17:59:27.13 |
-42:12:24.2 |
HIP 88135 |
13.90 |
| 2026-04-15 00:00 |
17:59:23.33 |
-42:13:41.6 |
HIP 88135 |
13.28 |
| 2026-04-15 12:00 |
17:59:19.37 |
-42:14:58.8 |
HIP 88135 |
12.81 |
| 2026-04-16 00:00 |
17:59:15.24 |
-42:16:15.9 |
HIP 88135 |
12.53 |