394P/PANSTARRS
| 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) |
| 2026-02-03 00:00 |
00:13:51.38 |
-06:49:11.1 |
HIP 1134 |
23.23 |
| 2026-02-03 12:00 |
00:14:09.61 |
-06:46:41.9 |
HIP 1134 |
25.24 |
| 2026-02-04 00:00 |
00:14:27.93 |
-06:44:12.3 |
HIP 1134 |
28.08 |
| 2026-02-04 12:00 |
00:14:46.34 |
-06:41:42.5 |
HIP 1303 |
31.06 |
| 2026-02-05 00:00 |
00:15:04.83 |
-06:39:12.3 |
HIP 1303 |
29.58 |
| 2026-02-05 12:00 |
00:15:23.41 |
-06:36:41.8 |
HIP 1230 |
28.47 |
| 2026-02-06 00:00 |
00:15:42.08 |
-06:34:11.0 |
HIP 1230 |
26.68 |
| 2026-02-06 12:00 |
00:16:00.84 |
-06:31:39.9 |
HIP 1230 |
25.87 |
| 2026-02-07 00:00 |
00:16:19.68 |
-06:29:08.5 |
HIP 1230 |
26.14 |
| 2026-02-07 12:00 |
00:16:38.60 |
-06:26:36.7 |
HIP 1423 |
23.12 |
| 2026-02-08 00:00 |
00:16:57.61 |
-06:24:04.7 |
HIP 1423 |
17.94 |
| 2026-02-08 12:00 |
00:17:16.70 |
-06:21:32.4 |
HIP 1423 |
12.91 |
| 2026-02-09 00:00 |
00:17:35.87 |
-06:18:59.9 |
HIP 1423 |
8.30 |
| 2026-02-09 12:00 |
00:17:55.12 |
-06:16:27.0 |
HIP 1423 |
5.43 |
| 2026-02-10 00:00 |
00:18:14.46 |
-06:13:53.9 |
HIP 1423 |
7.01 |
| 2026-02-10 12:00 |
00:18:33.87 |
-06:11:20.5 |
HIP 1423 |
11.33 |
| 2026-02-11 00:00 |
00:18:53.36 |
-06:08:46.8 |
HIP 1422 |
16.34 |
| 2026-02-11 12:00 |
00:19:12.93 |
-06:06:12.9 |
HIP 1422 |
21.41 |
| 2026-02-12 00:00 |
00:19:32.58 |
-06:03:38.7 |
HIP 1422 |
26.68 |
| 2026-02-12 12:00 |
00:19:52.31 |
-06:01:04.3 |
HIP 1422 |
32.05 |
| 2026-02-13 00:00 |
00:20:12.12 |
-05:58:29.6 |
HIP 1588 |
31.87 |
| 2026-02-13 12:00 |
00:20:31.99 |
-05:55:54.7 |
HIP 1588 |
30.57 |
| 2026-02-14 00:00 |
00:20:51.95 |
-05:53:19.6 |
HIP 1588 |
30.27 |
| 2026-02-14 12:00 |
00:21:11.98 |
-05:50:44.2 |
HIP 1588 |
31.00 |
| 2026-02-15 00:00 |
00:21:32.08 |
-05:48:08.6 |
HIP 1588 |
32.71 |
| 2026-02-15 12:00 |
00:21:52.25 |
-05:45:32.8 |
HIP 1755 |
34.47 |
| 2026-02-16 00:00 |
00:22:12.50 |
-05:42:56.8 |
HIP 1755 |
31.44 |
| 2026-02-16 12:00 |
00:22:32.82 |
-05:40:20.6 |
HIP 1755 |
29.20 |
| 2026-02-17 00:00 |
00:22:53.21 |
-05:37:44.2 |
HIP 1755 |
27.96 |
| 2026-02-17 12:00 |
00:23:13.67 |
-05:35:07.6 |
HIP 1755 |
27.86 |
| 2026-02-18 00:00 |
00:23:34.20 |
-05:32:30.8 |
HIP 1755 |
28.93 |
| 2026-02-18 12:00 |
00:23:54.79 |
-05:29:53.8 |
HIP 1755 |
31.05 |
| 2026-02-19 00:00 |
00:24:15.45 |
-05:27:16.7 |
HIP 1755 |
34.04 |
| 2026-02-19 12:00 |
00:24:36.18 |
-05:24:39.4 |
HIP 2117 |
34.51 |
| 2026-02-20 00:00 |
00:24:56.98 |
-05:22:01.9 |
HIP 2117 |
30.16 |
| 2026-02-20 12:00 |
00:25:17.84 |
-05:19:24.3 |
HIP 2117 |
26.36 |
| 2026-02-21 00:00 |
00:25:38.77 |
-05:16:46.5 |
HIP 2119 |
23.31 |
| 2026-02-21 12:00 |
00:25:59.75 |
-05:14:08.6 |
HIP 2119 |
21.44 |
| 2026-02-22 00:00 |
00:26:20.81 |
-05:11:30.5 |
HIP 2138 |
15.84 |
| 2026-02-22 12:00 |
00:26:41.92 |
-05:08:52.3 |
HIP 2138 |
10.44 |
| 2026-02-23 00:00 |
00:27:03.09 |
-05:06:14.0 |
HIP 2138 |
6.04 |
| 2026-02-23 12:00 |
00:27:24.33 |
-05:03:35.5 |
HIP 2138 |
5.79 |
| 2026-02-24 00:00 |
00:27:45.62 |
-05:00:57.0 |
HIP 2138 |
10.04 |