| Parameter |
Value |
| Designation |
364P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-06-24T08:55:28.565760Z |
| Orbit solution date (soln_date, UTC) |
2024-06-21T13:42:24Z |
| Obs used |
1487 |
| NEO |
Yes |
| M1 |
17.500 |
| K1 |
7.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-02-19.0000000 |
| e |
0.72258546 |
| q (au) |
0.798538 |
| a (au) |
2.878499 |
| i (deg) |
12.150085 |
| Ω (om, deg) |
46.217585 |
| ω (w, deg) |
211.966136 |
| M (ma, deg) |
122.023441 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.631 + 4.427\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.631 |
| n |
4.427 |
| gf |
1.000 |
| gb |
-0.722 |
| k |
0.828 |
| δ90 |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-12-25 |
2023-05-14 |
+32.5086 |
+0.697 |
| 2023-05-14 |
2023-12-06 |
+0.5617 |
-0.236 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
05:37:54.39 |
+30:04:04.3 |
HIP 26550 |
14.38 |
| 2026-06-01 12:00 |
05:38:22.64 |
+30:04:20.1 |
HIP 26550 |
10.30 |
| 2026-06-02 00:00 |
05:38:50.93 |
+30:04:35.8 |
HIP 26601 |
6.87 |
| 2026-06-02 12:00 |
05:39:19.27 |
+30:04:51.4 |
HIP 26601 |
4.27 |
| 2026-06-03 00:00 |
05:39:47.64 |
+30:05:07.0 |
HIP 26658 |
1.95 |
| 2026-06-03 12:00 |
05:40:16.05 |
+30:05:22.5 |
HIP 26658 |
4.21 |
| 2026-06-04 00:00 |
05:40:44.49 |
+30:05:37.9 |
HIP 26658 |
10.36 |
| 2026-06-04 12:00 |
05:41:12.98 |
+30:05:53.3 |
HIP 26854 |
16.49 |
| 2026-06-05 00:00 |
05:41:41.50 |
+30:06:08.5 |
HIP 26854 |
12.87 |
| 2026-06-05 12:00 |
05:42:10.05 |
+30:06:23.7 |
HIP 26854 |
11.63 |
| 2026-06-06 00:00 |
05:42:38.64 |
+30:06:38.8 |
HIP 26854 |
13.47 |
| 2026-06-06 12:00 |
05:43:07.27 |
+30:06:53.8 |
HIP 26854 |
17.44 |
| 2026-06-07 00:00 |
05:43:35.93 |
+30:07:08.8 |
HIP 26993 |
21.98 |
| 2026-06-07 12:00 |
05:44:04.62 |
+30:07:23.6 |
HIP 27179 |
20.05 |
| 2026-06-08 00:00 |
05:44:33.34 |
+30:07:38.4 |
HIP 27179 |
13.87 |
| 2026-06-08 12:00 |
05:45:02.10 |
+30:07:53.0 |
HIP 27179 |
7.76 |
| 2026-06-09 00:00 |
05:45:30.89 |
+30:08:07.6 |
HIP 27179 |
2.29 |
| 2026-06-09 12:00 |
05:45:59.70 |
+30:08:22.1 |
HIP 27179 |
5.29 |
| 2026-06-10 00:00 |
05:46:28.55 |
+30:08:36.5 |
HIP 27179 |
11.34 |
| 2026-06-10 12:00 |
05:46:57.43 |
+30:08:50.8 |
HIP 27179 |
17.53 |
| 2026-06-11 00:00 |
05:47:26.33 |
+30:09:05.0 |
HIP 27488 |
23.36 |
| 2026-06-11 12:00 |
05:47:55.26 |
+30:09:19.2 |
HIP 27488 |
17.22 |
| 2026-06-12 00:00 |
05:48:24.22 |
+30:09:33.2 |
HIP 27488 |
11.22 |
| 2026-06-12 12:00 |
05:48:53.20 |
+30:09:47.1 |
HIP 27488 |
5.81 |
| 2026-06-13 00:00 |
05:49:22.21 |
+30:10:01.0 |
HIP 27488 |
4.50 |
| 2026-06-13 12:00 |
05:49:51.24 |
+30:10:14.7 |
HIP 27488 |
9.25 |
| 2026-06-14 00:00 |
05:50:20.30 |
+30:10:28.4 |
HIP 27488 |
15.16 |
| 2026-06-14 12:00 |
05:50:49.38 |
+30:10:41.9 |
HIP 27488 |
21.30 |
| 2026-06-15 00:00 |
05:51:18.48 |
+30:10:55.4 |
HIP 27675 |
26.88 |
| 2026-06-15 12:00 |
05:51:47.60 |
+30:11:08.7 |
HIP 27675 |
26.74 |
| 2026-06-16 00:00 |
05:52:16.74 |
+30:11:22.0 |
HIP 27825 |
25.15 |
| 2026-06-16 12:00 |
05:52:45.90 |
+30:11:35.1 |
HIP 27825 |
22.36 |
| 2026-06-17 00:00 |
05:53:15.08 |
+30:11:48.2 |
HIP 27825 |
21.14 |
| 2026-06-17 12:00 |
05:53:44.28 |
+30:12:01.2 |
HIP 27825 |
21.75 |
| 2026-06-18 00:00 |
05:54:13.49 |
+30:12:14.0 |
HIP 28028 |
23.69 |
| 2026-06-18 12:00 |
05:54:42.72 |
+30:12:26.8 |
HIP 28028 |
19.33 |
| 2026-06-19 00:00 |
05:55:11.96 |
+30:12:39.4 |
HIP 28028 |
16.32 |
| 2026-06-19 12:00 |
05:55:41.22 |
+30:12:52.0 |
HIP 28028 |
15.46 |
| 2026-06-20 00:00 |
05:56:10.49 |
+30:13:04.4 |
HIP 28028 |
17.08 |
| 2026-06-20 12:00 |
05:56:39.77 |
+30:13:16.8 |
HIP 28028 |
20.61 |
| 2026-06-21 00:00 |
05:57:09.07 |
+30:13:29.0 |
HIP 28157 |
23.18 |
| 2026-06-21 12:00 |
05:57:38.37 |
+30:13:41.2 |
HIP 28309 |
22.26 |
| 2026-06-22 00:00 |
05:58:07.69 |
+30:13:53.2 |
HIP 28309 |
18.14 |