| 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) |
| 2026-07-29 00:00 |
06:33:59.10 |
+30:24:45.7 |
HIP 31233 |
12.86 |
| 2026-07-29 12:00 |
06:34:27.24 |
+30:24:52.6 |
HIP 31389 |
10.38 |
| 2026-07-30 00:00 |
06:34:55.33 |
+30:24:59.5 |
HIP 31389 |
9.45 |
| 2026-07-30 12:00 |
06:35:23.37 |
+30:25:06.5 |
HIP 31389 |
12.01 |
| 2026-07-31 00:00 |
06:35:51.37 |
+30:25:13.4 |
HIP 31389 |
16.50 |
| 2026-07-31 12:00 |
06:36:19.33 |
+30:25:20.4 |
HIP 31562 |
19.02 |
| 2026-08-01 00:00 |
06:36:47.24 |
+30:25:27.3 |
HIP 31562 |
19.87 |
| 2026-08-01 12:00 |
06:37:15.10 |
+30:25:34.3 |
HIP 31728 |
17.87 |
| 2026-08-02 00:00 |
06:37:42.92 |
+30:25:41.3 |
HIP 31728 |
13.88 |
| 2026-08-02 12:00 |
06:38:10.68 |
+30:25:48.3 |
HIP 31728 |
11.75 |
| 2026-08-03 00:00 |
06:38:38.40 |
+30:25:55.4 |
HIP 31728 |
12.44 |
| 2026-08-03 12:00 |
06:39:06.06 |
+30:26:02.5 |
HIP 31853 |
9.83 |
| 2026-08-04 00:00 |
06:39:33.68 |
+30:26:09.6 |
HIP 31853 |
7.92 |
| 2026-08-04 12:00 |
06:40:01.24 |
+30:26:16.8 |
HIP 31853 |
9.99 |
| 2026-08-05 00:00 |
06:40:28.75 |
+30:26:24.0 |
HIP 31853 |
14.40 |
| 2026-08-05 12:00 |
06:40:56.21 |
+30:26:31.2 |
HIP 31969 |
13.86 |
| 2026-08-06 00:00 |
06:41:23.61 |
+30:26:38.5 |
HIP 32050 |
15.29 |
| 2026-08-06 12:00 |
06:41:50.96 |
+30:26:45.8 |
HIP 32050 |
14.30 |
| 2026-08-07 00:00 |
06:42:18.25 |
+30:26:53.2 |
HIP 32050 |
15.63 |
| 2026-08-07 12:00 |
06:42:45.48 |
+30:27:00.6 |
HIP 32050 |
18.78 |
| 2026-08-08 00:00 |
06:43:12.66 |
+30:27:08.1 |
HIP 32298 |
17.76 |
| 2026-08-08 12:00 |
06:43:39.77 |
+30:27:15.7 |
HIP 32298 |
11.95 |
| 2026-08-09 00:00 |
06:44:06.83 |
+30:27:23.3 |
HIP 32298 |
6.22 |
| 2026-08-09 12:00 |
06:44:33.82 |
+30:27:31.1 |
HIP 32298 |
1.63 |
| 2026-08-10 00:00 |
06:45:00.76 |
+30:27:38.9 |
HIP 32298 |
5.84 |
| 2026-08-10 12:00 |
06:45:27.63 |
+30:27:46.7 |
HIP 32298 |
11.52 |
| 2026-08-11 00:00 |
06:45:54.43 |
+30:27:54.7 |
HIP 32298 |
17.25 |
| 2026-08-11 12:00 |
06:46:21.17 |
+30:28:02.7 |
HIP 32512 |
15.15 |
| 2026-08-12 00:00 |
06:46:47.84 |
+30:28:10.9 |
HIP 32512 |
12.32 |
| 2026-08-12 12:00 |
06:47:14.45 |
+30:28:19.1 |
HIP 32512 |
11.85 |
| 2026-08-13 00:00 |
06:47:40.99 |
+30:28:27.5 |
HIP 32512 |
13.96 |
| 2026-08-13 12:00 |
06:48:07.45 |
+30:28:35.9 |
HIP 32512 |
17.73 |
| 2026-08-14 00:00 |
06:48:33.85 |
+30:28:44.5 |
HIP 32512 |
22.33 |
| 2026-08-14 12:00 |
06:49:00.18 |
+30:28:53.1 |
HIP 32834 |
23.73 |
| 2026-08-15 00:00 |
06:49:26.43 |
+30:29:01.9 |
HIP 32834 |
18.71 |
| 2026-08-15 12:00 |
06:49:52.61 |
+30:29:10.9 |
HIP 32834 |
14.19 |
| 2026-08-16 00:00 |
06:50:18.72 |
+30:29:19.9 |
HIP 32834 |
10.80 |
| 2026-08-16 12:00 |
06:50:44.74 |
+30:29:29.1 |
HIP 32834 |
9.76 |
| 2026-08-17 00:00 |
06:51:10.70 |
+30:29:38.4 |
HIP 32834 |
11.70 |
| 2026-08-17 12:00 |
06:51:36.57 |
+30:29:47.9 |
HIP 32834 |
15.52 |
| 2026-08-18 00:00 |
06:52:02.37 |
+30:29:57.5 |
HIP 32834 |
20.16 |
| 2026-08-18 12:00 |
06:52:28.09 |
+30:30:07.2 |
HIP 32834 |
25.17 |
| 2026-08-19 00:00 |
06:52:53.73 |
+30:30:17.1 |
HIP 32834 |
30.35 |