| Parameter |
Value |
| Designation |
394P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-11-30T03:51:06.033600Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T17:31:58Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-09-13.0000000 |
| e |
0.36911578 |
| q (au) |
2.737095 |
| a (au) |
4.338507 |
| i (deg) |
8.527558 |
| Ω (om, deg) |
98.139243 |
| ω (w, deg) |
54.497804 |
| M (ma, deg) |
271.856301 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.004 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.004 |
| n |
2.000 |
| gf |
0.937 |
| gb |
-0.901 |
| k |
0.998 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
02:12:25.89 |
+02:44:03.4 |
HIP 10273 |
2.62 |
| 2026-09-25 12:00 |
02:12:13.57 |
+02:42:26.7 |
HIP 10273 |
2.35 |
| 2026-09-26 00:00 |
02:12:01.09 |
+02:40:49.6 |
HIP 10273 |
5.35 |
| 2026-09-26 12:00 |
02:11:48.45 |
+02:39:12.2 |
HIP 10273 |
8.78 |
| 2026-09-27 00:00 |
02:11:35.64 |
+02:37:34.5 |
HIP 10273 |
12.31 |
| 2026-09-27 12:00 |
02:11:22.68 |
+02:35:56.4 |
HIP 10273 |
15.91 |
| 2026-09-28 00:00 |
02:11:09.56 |
+02:34:18.1 |
HIP 10273 |
19.55 |
| 2026-09-28 12:00 |
02:10:56.29 |
+02:32:39.5 |
HIP 10273 |
23.23 |
| 2026-09-29 00:00 |
02:10:42.87 |
+02:31:00.6 |
HIP 10273 |
26.95 |
| 2026-09-29 12:00 |
02:10:29.29 |
+02:29:21.4 |
HIP 10273 |
30.71 |
| 2026-09-30 00:00 |
02:10:15.57 |
+02:27:42.0 |
HIP 10273 |
34.51 |
| 2026-09-30 12:00 |
02:10:01.69 |
+02:26:02.4 |
HIP 9986 |
36.87 |
| 2026-10-01 00:00 |
02:09:47.67 |
+02:24:22.6 |
HIP 9986 |
33.56 |
| 2026-10-01 12:00 |
02:09:33.51 |
+02:22:42.7 |
HIP 9986 |
30.36 |
| 2026-10-02 00:00 |
02:09:19.21 |
+02:21:02.5 |
HIP 9986 |
27.34 |
| 2026-10-02 12:00 |
02:09:04.77 |
+02:19:22.2 |
HIP 9986 |
24.56 |
| 2026-10-03 00:00 |
02:08:50.18 |
+02:17:41.7 |
HIP 9986 |
22.15 |
| 2026-10-03 12:00 |
02:08:35.47 |
+02:16:01.2 |
HIP 9986 |
20.24 |
| 2026-10-04 00:00 |
02:08:20.62 |
+02:14:20.5 |
HIP 9986 |
19.03 |
| 2026-10-04 12:00 |
02:08:05.64 |
+02:12:39.8 |
HIP 9986 |
18.65 |
| 2026-10-05 00:00 |
02:07:50.53 |
+02:10:59.0 |
HIP 9986 |
19.19 |
| 2026-10-05 12:00 |
02:07:35.29 |
+02:09:18.1 |
HIP 9986 |
20.58 |
| 2026-10-06 00:00 |
02:07:19.93 |
+02:07:37.2 |
HIP 9986 |
22.69 |
| 2026-10-06 12:00 |
02:07:04.45 |
+02:05:56.3 |
HIP 9986 |
25.35 |
| 2026-10-07 00:00 |
02:06:48.85 |
+02:04:15.5 |
HIP 9986 |
28.41 |
| 2026-10-07 12:00 |
02:06:33.13 |
+02:02:34.6 |
HIP 9986 |
31.78 |
| 2026-10-08 00:00 |
02:06:17.30 |
+02:00:53.8 |
HIP 9856 |
35.23 |
| 2026-10-08 12:00 |
02:06:01.36 |
+01:59:13.1 |
HIP 9856 |
34.73 |
| 2026-10-09 00:00 |
02:05:45.31 |
+01:57:32.5 |
HIP 9856 |
34.78 |
| 2026-10-09 12:00 |
02:05:29.15 |
+01:55:52.0 |
HIP 9612 |
34.73 |
| 2026-10-10 00:00 |
02:05:12.89 |
+01:54:11.6 |
HIP 9612 |
30.44 |
| 2026-10-10 12:00 |
02:04:56.53 |
+01:52:31.4 |
HIP 9612 |
26.16 |
| 2026-10-11 00:00 |
02:04:40.07 |
+01:50:51.3 |
HIP 9612 |
21.91 |
| 2026-10-11 12:00 |
02:04:23.52 |
+01:49:11.5 |
HIP 9612 |
17.74 |
| 2026-10-12 00:00 |
02:04:06.88 |
+01:47:31.8 |
HIP 9612 |
13.75 |
| 2026-10-12 12:00 |
02:03:50.15 |
+01:45:52.4 |
HIP 9612 |
10.16 |
| 2026-10-13 00:00 |
02:03:33.34 |
+01:44:13.2 |
HIP 9612 |
7.61 |
| 2026-10-13 12:00 |
02:03:16.44 |
+01:42:34.4 |
HIP 9612 |
7.33 |
| 2026-10-14 00:00 |
02:02:59.47 |
+01:40:55.8 |
HIP 9612 |
9.53 |
| 2026-10-14 12:00 |
02:02:42.42 |
+01:39:17.5 |
HIP 9579 |
12.79 |
| 2026-10-15 00:00 |
02:02:25.29 |
+01:37:39.6 |
HIP 9579 |
16.43 |
| 2026-10-15 12:00 |
02:02:08.10 |
+01:36:02.0 |
HIP 9457 |
17.03 |
| 2026-10-16 00:00 |
02:01:50.84 |
+01:34:24.7 |
HIP 9457 |
14.12 |