| 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
$$
M_a = (16.415 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.415 |
| n |
2.000 |
| gf |
0.990 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.998 |
| 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) |
| 2026-06-01 00:00 |
23:56:21.80 |
-08:27:15.5 |
HIP 117924 |
18.52 |
| 2026-06-01 12:00 |
23:56:37.34 |
-08:26:47.8 |
HIP 117924 |
22.34 |
| 2026-06-02 00:00 |
23:56:52.75 |
-08:26:21.1 |
HIP 117924 |
26.16 |
| 2026-06-02 12:00 |
23:57:08.06 |
-08:25:55.6 |
HIP 118253 |
29.83 |
| 2026-06-03 00:00 |
23:57:23.24 |
-08:25:31.0 |
HIP 118253 |
26.15 |
| 2026-06-03 12:00 |
23:57:38.31 |
-08:25:07.6 |
HIP 118253 |
22.54 |
| 2026-06-04 00:00 |
23:57:53.26 |
-08:24:45.2 |
HIP 118253 |
19.00 |
| 2026-06-04 12:00 |
23:58:08.10 |
-08:24:24.0 |
HIP 118253 |
15.57 |
| 2026-06-05 00:00 |
23:58:22.81 |
-08:24:03.8 |
HIP 118253 |
12.30 |
| 2026-06-05 12:00 |
23:58:37.40 |
-08:23:44.7 |
HIP 118253 |
9.35 |
| 2026-06-06 00:00 |
23:58:51.87 |
-08:23:26.7 |
HIP 118253 |
7.04 |
| 2026-06-06 12:00 |
23:59:06.22 |
-08:23:09.8 |
HIP 118253 |
6.11 |
| 2026-06-07 00:00 |
23:59:20.44 |
-08:22:54.0 |
HIP 118253 |
7.07 |
| 2026-06-07 12:00 |
23:59:34.54 |
-08:22:39.4 |
HIP 118253 |
9.32 |
| 2026-06-08 00:00 |
23:59:48.51 |
-08:22:25.9 |
HIP 118253 |
12.14 |
| 2026-06-08 12:00 |
00:00:02.36 |
-08:22:13.5 |
HIP 118253 |
15.19 |
| 2026-06-09 00:00 |
00:00:16.08 |
-08:22:02.2 |
HIP 118253 |
18.34 |
| 2026-06-09 12:00 |
00:00:29.67 |
-08:21:52.1 |
HIP 118253 |
21.53 |
| 2026-06-10 00:00 |
00:00:43.13 |
-08:21:43.2 |
HIP 118253 |
24.72 |
| 2026-06-10 12:00 |
00:00:56.47 |
-08:21:35.4 |
HIP 210 |
26.48 |
| 2026-06-11 00:00 |
00:01:09.67 |
-08:21:28.8 |
HIP 210 |
23.41 |
| 2026-06-11 12:00 |
00:01:22.74 |
-08:21:23.3 |
HIP 210 |
20.42 |
| 2026-06-12 00:00 |
00:01:35.67 |
-08:21:19.0 |
HIP 210 |
17.55 |
| 2026-06-12 12:00 |
00:01:48.48 |
-08:21:16.0 |
HIP 210 |
14.82 |
| 2026-06-13 00:00 |
00:02:01.14 |
-08:21:14.1 |
HIP 210 |
12.33 |
| 2026-06-13 12:00 |
00:02:13.67 |
-08:21:13.3 |
HIP 210 |
10.19 |
| 2026-06-14 00:00 |
00:02:26.07 |
-08:21:13.8 |
HIP 210 |
8.65 |
| 2026-06-14 12:00 |
00:02:38.33 |
-08:21:15.5 |
HIP 210 |
8.02 |
| 2026-06-15 00:00 |
00:02:50.44 |
-08:21:18.4 |
HIP 210 |
8.46 |
| 2026-06-15 12:00 |
00:03:02.42 |
-08:21:22.6 |
HIP 210 |
9.81 |
| 2026-06-16 00:00 |
00:03:14.26 |
-08:21:27.9 |
HIP 210 |
11.72 |
| 2026-06-16 12:00 |
00:03:25.95 |
-08:21:34.5 |
HIP 210 |
13.95 |
| 2026-06-17 00:00 |
00:03:37.50 |
-08:21:42.3 |
HIP 210 |
16.35 |
| 2026-06-17 12:00 |
00:03:48.91 |
-08:21:51.3 |
HIP 373 |
16.57 |
| 2026-06-18 00:00 |
00:04:00.18 |
-08:22:01.6 |
HIP 373 |
14.69 |
| 2026-06-18 12:00 |
00:04:11.30 |
-08:22:13.1 |
HIP 373 |
13.17 |
| 2026-06-19 00:00 |
00:04:22.27 |
-08:22:25.8 |
HIP 373 |
12.14 |
| 2026-06-19 12:00 |
00:04:33.10 |
-08:22:39.8 |
HIP 373 |
11.69 |
| 2026-06-20 00:00 |
00:04:43.78 |
-08:22:55.1 |
HIP 373 |
11.86 |
| 2026-06-20 12:00 |
00:04:54.32 |
-08:23:11.5 |
HIP 373 |
12.62 |
| 2026-06-21 00:00 |
00:05:04.70 |
-08:23:29.3 |
HIP 373 |
13.84 |
| 2026-06-21 12:00 |
00:05:14.94 |
-08:23:48.3 |
HIP 373 |
15.39 |
| 2026-06-22 00:00 |
00:05:25.02 |
-08:24:08.6 |
HIP 373 |
17.18 |