| 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) |
| 2026-09-20 00:00 |
07:16:42.83 |
+30:49:52.4 |
HIP 35193 |
8.63 |
| 2026-09-20 12:00 |
07:17:01.01 |
+30:50:23.2 |
HIP 35193 |
11.42 |
| 2026-09-21 00:00 |
07:17:19.04 |
+30:50:54.4 |
HIP 35345 |
11.62 |
| 2026-09-21 12:00 |
07:17:36.91 |
+30:51:26.2 |
HIP 35345 |
8.31 |
| 2026-09-22 00:00 |
07:17:54.63 |
+30:51:58.5 |
HIP 35345 |
5.75 |
| 2026-09-22 12:00 |
07:18:12.18 |
+30:52:31.3 |
HIP 35372 |
4.30 |
| 2026-09-23 00:00 |
07:18:29.58 |
+30:53:04.6 |
HIP 35372 |
3.68 |
| 2026-09-23 12:00 |
07:18:46.81 |
+30:53:38.5 |
HIP 35372 |
6.08 |
| 2026-09-24 00:00 |
07:19:03.88 |
+30:54:12.9 |
HIP 35372 |
9.37 |
| 2026-09-24 12:00 |
07:19:20.79 |
+30:54:47.9 |
HIP 35372 |
12.86 |
| 2026-09-25 00:00 |
07:19:37.53 |
+30:55:23.4 |
HIP 35372 |
16.40 |
| 2026-09-25 12:00 |
07:19:54.10 |
+30:55:59.5 |
HIP 35372 |
19.95 |
| 2026-09-26 00:00 |
07:20:10.51 |
+30:56:36.1 |
HIP 35667 |
18.17 |
| 2026-09-26 12:00 |
07:20:26.74 |
+30:57:13.3 |
HIP 35667 |
14.94 |
| 2026-09-27 00:00 |
07:20:42.81 |
+30:57:51.1 |
HIP 35667 |
11.91 |
| 2026-09-27 12:00 |
07:20:58.70 |
+30:58:29.4 |
HIP 35667 |
9.28 |
| 2026-09-28 00:00 |
07:21:14.42 |
+30:59:08.3 |
HIP 35667 |
7.39 |
| 2026-09-28 12:00 |
07:21:29.96 |
+30:59:47.9 |
HIP 35667 |
6.85 |
| 2026-09-29 00:00 |
07:21:45.33 |
+31:00:28.0 |
HIP 35667 |
7.89 |
| 2026-09-29 12:00 |
07:22:00.52 |
+31:01:08.7 |
HIP 35667 |
10.00 |
| 2026-09-30 00:00 |
07:22:15.53 |
+31:01:50.0 |
HIP 35667 |
12.62 |
| 2026-09-30 12:00 |
07:22:30.35 |
+31:02:31.9 |
HIP 35667 |
15.47 |
| 2026-10-01 00:00 |
07:22:45.00 |
+31:03:14.5 |
HIP 35667 |
18.43 |
| 2026-10-01 12:00 |
07:22:59.46 |
+31:03:57.7 |
HIP 35667 |
21.44 |
| 2026-10-02 00:00 |
07:23:13.73 |
+31:04:41.5 |
HIP 35948 |
22.47 |
| 2026-10-02 12:00 |
07:23:27.81 |
+31:05:25.9 |
HIP 35948 |
20.62 |
| 2026-10-03 00:00 |
07:23:41.71 |
+31:06:11.0 |
HIP 35948 |
19.12 |
| 2026-10-03 12:00 |
07:23:55.41 |
+31:06:56.8 |
HIP 35948 |
18.06 |
| 2026-10-04 00:00 |
07:24:08.92 |
+31:07:43.2 |
HIP 35948 |
17.49 |
| 2026-10-04 12:00 |
07:24:22.24 |
+31:08:30.2 |
HIP 35948 |
17.45 |
| 2026-10-05 00:00 |
07:24:35.36 |
+31:09:17.9 |
HIP 35948 |
17.92 |
| 2026-10-05 12:00 |
07:24:48.28 |
+31:10:06.3 |
HIP 35948 |
18.84 |
| 2026-10-06 00:00 |
07:25:01.00 |
+31:10:55.4 |
HIP 35948 |
20.13 |
| 2026-10-06 12:00 |
07:25:13.51 |
+31:11:45.1 |
HIP 35948 |
21.72 |
| 2026-10-07 00:00 |
07:25:25.83 |
+31:12:35.5 |
HIP 35948 |
23.52 |
| 2026-10-07 12:00 |
07:25:37.93 |
+31:13:26.7 |
HIP 35948 |
25.49 |
| 2026-10-08 00:00 |
07:25:49.83 |
+31:14:18.5 |
HIP 36139 |
25.24 |
| 2026-10-08 12:00 |
07:26:01.53 |
+31:15:11.0 |
HIP 36139 |
23.47 |
| 2026-10-09 00:00 |
07:26:13.01 |
+31:16:04.2 |
HIP 36139 |
21.88 |
| 2026-10-09 12:00 |
07:26:24.28 |
+31:16:58.2 |
HIP 36139 |
20.50 |
| 2026-10-10 00:00 |
07:26:35.33 |
+31:17:52.8 |
HIP 36139 |
19.35 |
| 2026-10-10 12:00 |
07:26:46.17 |
+31:18:48.2 |
HIP 36139 |
18.45 |
| 2026-10-11 00:00 |
07:26:56.79 |
+31:19:44.3 |
HIP 36139 |
17.85 |