| Parameter |
Value |
| Designation |
386P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-06-21T04:09:09.524160Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:09Z |
| Obs used |
118 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-30.0000000 |
| e |
0.41776560 |
| q (au) |
2.359299 |
| a (au) |
4.052147 |
| i (deg) |
15.244307 |
| Ω (om, deg) |
134.979116 |
| ω (w, deg) |
353.350939 |
| M (ma, deg) |
144.492270 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.414 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.414 |
| n |
2.000 |
| gf |
0.980 |
| gb |
-0.503 |
| k |
1.000 |
| δ90 |
9.995 |
| 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 |
23:09:18.07 |
-11:28:35.1 |
HIP 114419 |
15.41 |
| 2026-03-26 12:00 |
23:09:42.62 |
-11:26:38.4 |
HIP 114419 |
9.63 |
| 2026-03-27 00:00 |
23:10:07.15 |
-11:24:42.0 |
HIP 114419 |
5.29 |
| 2026-03-27 12:00 |
23:10:31.66 |
-11:22:45.9 |
HIP 114419 |
6.56 |
| 2026-03-28 00:00 |
23:10:56.13 |
-11:20:50.1 |
HIP 114419 |
11.72 |
| 2026-03-28 12:00 |
23:11:20.58 |
-11:18:54.6 |
HIP 114419 |
17.63 |
| 2026-03-29 00:00 |
23:11:45.00 |
-11:16:59.4 |
HIP 114419 |
23.73 |
| 2026-03-29 12:00 |
23:12:09.39 |
-11:15:04.5 |
HIP 114419 |
29.90 |
| 2026-03-30 00:00 |
23:12:33.75 |
-11:13:10.0 |
HIP 114419 |
36.10 |
| 2026-03-30 12:00 |
23:12:58.08 |
-11:11:15.8 |
HIP 114750 |
39.05 |
| 2026-03-31 00:00 |
23:13:22.38 |
-11:09:21.9 |
HIP 114750 |
33.93 |
| 2026-03-31 12:00 |
23:13:46.65 |
-11:07:28.4 |
HIP 114750 |
29.27 |
| 2026-04-01 00:00 |
23:14:10.89 |
-11:05:35.2 |
HIP 114750 |
25.31 |
| 2026-04-01 12:00 |
23:14:35.09 |
-11:03:42.3 |
HIP 114750 |
22.42 |
| 2026-04-02 00:00 |
23:14:59.27 |
-11:01:49.8 |
HIP 114750 |
21.04 |
| 2026-04-02 12:00 |
23:15:23.41 |
-10:59:57.7 |
HIP 114750 |
21.45 |
| 2026-04-03 00:00 |
23:15:47.51 |
-10:58:05.9 |
HIP 114750 |
23.56 |
| 2026-04-03 12:00 |
23:16:11.58 |
-10:56:14.5 |
HIP 114750 |
26.95 |
| 2026-04-04 00:00 |
23:16:35.62 |
-10:54:23.4 |
HIP 115031 |
28.78 |
| 2026-04-04 12:00 |
23:16:59.62 |
-10:52:32.8 |
HIP 115031 |
26.82 |
| 2026-04-05 00:00 |
23:17:23.59 |
-10:50:42.5 |
HIP 115031 |
26.20 |
| 2026-04-05 12:00 |
23:17:47.52 |
-10:48:52.6 |
HIP 115031 |
27.00 |
| 2026-04-06 00:00 |
23:18:11.42 |
-10:47:03.1 |
HIP 115031 |
29.10 |
| 2026-04-06 12:00 |
23:18:35.27 |
-10:45:13.9 |
HIP 114959 |
32.08 |
| 2026-04-07 00:00 |
23:18:59.09 |
-10:43:25.2 |
HIP 115278 |
30.19 |
| 2026-04-07 12:00 |
23:19:22.87 |
-10:41:36.9 |
HIP 115278 |
24.11 |
| 2026-04-08 00:00 |
23:19:46.62 |
-10:39:49.0 |
HIP 115278 |
18.06 |
| 2026-04-08 12:00 |
23:20:10.32 |
-10:38:01.6 |
HIP 115278 |
12.07 |
| 2026-04-09 00:00 |
23:20:33.98 |
-10:36:14.5 |
HIP 115278 |
6.30 |
| 2026-04-09 12:00 |
23:20:57.60 |
-10:34:27.9 |
HIP 115278 |
2.78 |
| 2026-04-10 00:00 |
23:21:21.18 |
-10:32:41.7 |
HIP 115278 |
7.02 |
| 2026-04-10 12:00 |
23:21:44.72 |
-10:30:56.0 |
HIP 115278 |
12.81 |
| 2026-04-11 00:00 |
23:22:08.22 |
-10:29:10.7 |
HIP 115278 |
18.75 |
| 2026-04-11 12:00 |
23:22:31.67 |
-10:27:25.8 |
HIP 115445 |
20.16 |
| 2026-04-12 00:00 |
23:22:55.08 |
-10:25:41.5 |
HIP 115445 |
20.34 |
| 2026-04-12 12:00 |
23:23:18.45 |
-10:23:57.5 |
HIP 115445 |
22.19 |
| 2026-04-13 00:00 |
23:23:41.77 |
-10:22:14.1 |
HIP 115445 |
25.36 |
| 2026-04-13 12:00 |
23:24:05.04 |
-10:20:31.1 |
HIP 115445 |
29.40 |
| 2026-04-14 00:00 |
23:24:28.27 |
-10:18:48.7 |
HIP 115445 |
34.00 |
| 2026-04-14 12:00 |
23:24:51.45 |
-10:17:06.7 |
HIP 115712 |
29.87 |
| 2026-04-15 00:00 |
23:25:14.58 |
-10:15:25.2 |
HIP 115712 |
24.15 |
| 2026-04-15 12:00 |
23:25:37.66 |
-10:13:44.2 |
HIP 115712 |
18.57 |
| 2026-04-16 00:00 |
23:26:00.70 |
-10:12:03.7 |
HIP 115712 |
13.30 |