| Parameter |
Value |
| Designation |
365P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-10T18:09:33.384960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:38Z |
| Obs used |
403 |
| NEO |
- |
| M1 |
17.000 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-12-14.0000000 |
| e |
0.57334364 |
| q (au) |
1.359121 |
| a (au) |
3.185517 |
| i (deg) |
9.836431 |
| Ω (om, deg) |
87.442495 |
| ω (w, deg) |
66.397480 |
| M (ma, deg) |
349.814297 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.429 + 4.999\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.429 |
| n |
4.999 |
| gf |
1.000 |
| gb |
-0.552 |
| k |
0.800 |
| 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) |
| 2026-09-25 00:00 |
22:29:54.12 |
-21:36:36.4 |
HIP 111225 |
30.03 |
| 2026-09-25 12:00 |
22:29:37.03 |
-21:37:35.6 |
HIP 110881 |
28.66 |
| 2026-09-26 00:00 |
22:29:20.07 |
-21:38:33.3 |
HIP 110881 |
24.81 |
| 2026-09-26 12:00 |
22:29:03.25 |
-21:39:29.5 |
HIP 110881 |
21.08 |
| 2026-09-27 00:00 |
22:28:46.58 |
-21:40:24.1 |
HIP 110881 |
17.51 |
| 2026-09-27 12:00 |
22:28:30.05 |
-21:41:17.3 |
HIP 110881 |
14.21 |
| 2026-09-28 00:00 |
22:28:13.67 |
-21:42:09.0 |
HIP 110881 |
11.35 |
| 2026-09-28 12:00 |
22:27:57.44 |
-21:42:59.2 |
HIP 110881 |
9.32 |
| 2026-09-29 00:00 |
22:27:41.35 |
-21:43:47.8 |
HIP 110881 |
8.66 |
| 2026-09-29 12:00 |
22:27:25.43 |
-21:44:35.0 |
HIP 110881 |
9.60 |
| 2026-09-30 00:00 |
22:27:09.65 |
-21:45:20.7 |
HIP 110881 |
11.73 |
| 2026-09-30 12:00 |
22:26:54.04 |
-21:46:04.8 |
HIP 110881 |
14.51 |
| 2026-10-01 00:00 |
22:26:38.58 |
-21:46:47.5 |
HIP 110881 |
17.59 |
| 2026-10-01 12:00 |
22:26:23.29 |
-21:47:28.6 |
HIP 110693 |
15.69 |
| 2026-10-02 00:00 |
22:26:08.16 |
-21:48:08.2 |
HIP 110693 |
14.13 |
| 2026-10-02 12:00 |
22:25:53.19 |
-21:48:46.3 |
HIP 110693 |
13.36 |
| 2026-10-03 00:00 |
22:25:38.40 |
-21:49:22.9 |
HIP 110693 |
13.47 |
| 2026-10-03 12:00 |
22:25:23.77 |
-21:49:58.0 |
HIP 110693 |
14.42 |
| 2026-10-04 00:00 |
22:25:09.31 |
-21:50:31.5 |
HIP 110693 |
16.02 |
| 2026-10-04 12:00 |
22:24:55.03 |
-21:51:03.6 |
HIP 110590 |
17.69 |
| 2026-10-05 00:00 |
22:24:40.93 |
-21:51:34.1 |
HIP 110590 |
16.75 |
| 2026-10-05 12:00 |
22:24:27.00 |
-21:52:03.1 |
HIP 110590 |
16.41 |
| 2026-10-06 00:00 |
22:24:13.25 |
-21:52:30.6 |
HIP 110590 |
16.70 |
| 2026-10-06 12:00 |
22:23:59.68 |
-21:52:56.6 |
HIP 110509 |
15.07 |
| 2026-10-07 00:00 |
22:23:46.29 |
-21:53:21.1 |
HIP 110509 |
12.69 |
| 2026-10-07 12:00 |
22:23:33.09 |
-21:53:44.1 |
HIP 110509 |
10.74 |
| 2026-10-08 00:00 |
22:23:20.08 |
-21:54:05.5 |
HIP 110509 |
9.45 |
| 2026-10-08 12:00 |
22:23:07.25 |
-21:54:25.5 |
HIP 110509 |
9.06 |
| 2026-10-09 00:00 |
22:22:54.62 |
-21:54:43.9 |
HIP 110509 |
9.64 |
| 2026-10-09 12:00 |
22:22:42.17 |
-21:55:00.9 |
HIP 110509 |
10.99 |
| 2026-10-10 00:00 |
22:22:29.92 |
-21:55:16.3 |
HIP 110509 |
12.85 |
| 2026-10-10 12:00 |
22:22:17.86 |
-21:55:30.3 |
HIP 110509 |
14.99 |
| 2026-10-11 00:00 |
22:22:06.00 |
-21:55:42.7 |
HIP 110509 |
17.30 |
| 2026-10-11 12:00 |
22:21:54.34 |
-21:55:53.7 |
HIP 110509 |
19.68 |
| 2026-10-12 00:00 |
22:21:42.87 |
-21:56:03.2 |
HIP 110391 |
20.24 |
| 2026-10-12 12:00 |
22:21:31.61 |
-21:56:11.2 |
HIP 110391 |
20.33 |
| 2026-10-13 00:00 |
22:21:20.54 |
-21:56:17.7 |
HIP 110255 |
19.09 |
| 2026-10-13 12:00 |
22:21:09.68 |
-21:56:22.8 |
HIP 110255 |
16.64 |
| 2026-10-14 00:00 |
22:20:59.02 |
-21:56:26.3 |
HIP 110255 |
14.27 |
| 2026-10-14 12:00 |
22:20:48.56 |
-21:56:28.5 |
HIP 110255 |
11.99 |
| 2026-10-15 00:00 |
22:20:38.31 |
-21:56:29.1 |
HIP 110255 |
9.84 |
| 2026-10-15 12:00 |
22:20:28.27 |
-21:56:28.3 |
HIP 110255 |
7.87 |
| 2026-10-16 00:00 |
22:20:18.43 |
-21:56:26.1 |
HIP 110255 |
6.21 |