| Parameter |
Value |
| Designation |
382P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-07-08T09:40:46.269120Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:13:13Z |
| Obs used |
543 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
14.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-05-31T10:50:13.056000Z |
| Discovery magnitude (MPC) |
22.00 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-02-14.0000000 |
| e |
0.27620614 |
| q (au) |
4.380367 |
| a (au) |
6.051954 |
| i (deg) |
7.867442 |
| Ω (om, deg) |
181.665365 |
| ω (w, deg) |
175.509381 |
| M (ma, deg) |
181.166011 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.637 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.637 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.503 |
| k |
1.000 |
| δ90 |
10.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
08:18:25.06 |
+13:22:51.4 |
HIP 40657 |
16.76 |
| 2026-09-20 12:00 |
08:18:39.19 |
+13:21:50.7 |
HIP 40657 |
19.19 |
| 2026-09-21 00:00 |
08:18:53.22 |
+13:20:50.1 |
HIP 40657 |
21.92 |
| 2026-09-21 12:00 |
08:19:07.16 |
+13:19:49.6 |
HIP 40657 |
24.85 |
| 2026-09-22 00:00 |
08:19:21.02 |
+13:18:49.2 |
HIP 40657 |
27.90 |
| 2026-09-22 12:00 |
08:19:34.78 |
+13:17:48.9 |
HIP 40657 |
31.03 |
| 2026-09-23 00:00 |
08:19:48.45 |
+13:16:48.7 |
HIP 40657 |
34.22 |
| 2026-09-23 12:00 |
08:20:02.03 |
+13:15:48.6 |
HIP 40956 |
34.46 |
| 2026-09-24 00:00 |
08:20:15.52 |
+13:14:48.7 |
HIP 40956 |
31.69 |
| 2026-09-24 12:00 |
08:20:28.92 |
+13:13:48.9 |
HIP 40956 |
29.09 |
| 2026-09-25 00:00 |
08:20:42.22 |
+13:12:49.2 |
HIP 40956 |
26.68 |
| 2026-09-25 12:00 |
08:20:55.42 |
+13:11:49.6 |
HIP 40956 |
24.51 |
| 2026-09-26 00:00 |
08:21:08.54 |
+13:10:50.2 |
HIP 40956 |
22.64 |
| 2026-09-26 12:00 |
08:21:21.55 |
+13:09:50.9 |
HIP 40956 |
21.15 |
| 2026-09-27 00:00 |
08:21:34.47 |
+13:08:51.8 |
HIP 40956 |
20.09 |
| 2026-09-27 12:00 |
08:21:47.30 |
+13:07:52.8 |
HIP 40956 |
19.55 |
| 2026-09-28 00:00 |
08:22:00.02 |
+13:06:54.0 |
HIP 40956 |
19.53 |
| 2026-09-28 12:00 |
08:22:12.65 |
+13:05:55.3 |
HIP 40956 |
20.04 |
| 2026-09-29 00:00 |
08:22:25.18 |
+13:04:56.8 |
HIP 40956 |
21.03 |
| 2026-09-29 12:00 |
08:22:37.61 |
+13:03:58.5 |
HIP 40956 |
22.42 |
| 2026-09-30 00:00 |
08:22:49.94 |
+13:03:00.3 |
HIP 40956 |
24.13 |
| 2026-09-30 12:00 |
08:23:02.18 |
+13:02:02.3 |
HIP 40956 |
26.10 |
| 2026-10-01 00:00 |
08:23:14.31 |
+13:01:04.5 |
HIP 40956 |
28.25 |
| 2026-10-01 12:00 |
08:23:26.33 |
+13:00:06.9 |
HIP 40956 |
30.55 |
| 2026-10-02 00:00 |
08:23:38.26 |
+12:59:09.4 |
HIP 41189 |
32.79 |
| 2026-10-02 12:00 |
08:23:50.08 |
+12:58:12.2 |
HIP 41189 |
32.96 |
| 2026-10-03 00:00 |
08:24:01.80 |
+12:57:15.1 |
HIP 41189 |
33.40 |
| 2026-10-03 12:00 |
08:24:13.42 |
+12:56:18.3 |
HIP 41189 |
34.10 |
| 2026-10-04 00:00 |
08:24:24.92 |
+12:55:21.6 |
HIP 41189 |
35.03 |
| 2026-10-04 12:00 |
08:24:36.33 |
+12:54:25.2 |
HIP 41400 |
34.60 |
| 2026-10-05 00:00 |
08:24:47.62 |
+12:53:29.0 |
HIP 41400 |
31.71 |
| 2026-10-05 12:00 |
08:24:58.81 |
+12:52:33.0 |
HIP 41400 |
28.86 |
| 2026-10-06 00:00 |
08:25:09.89 |
+12:51:37.2 |
HIP 41400 |
26.04 |
| 2026-10-06 12:00 |
08:25:20.86 |
+12:50:41.7 |
HIP 41400 |
23.25 |
| 2026-10-07 00:00 |
08:25:31.73 |
+12:49:46.4 |
HIP 41400 |
20.49 |
| 2026-10-07 12:00 |
08:25:42.48 |
+12:48:51.3 |
HIP 41400 |
17.78 |
| 2026-10-08 00:00 |
08:25:53.12 |
+12:47:56.5 |
HIP 41400 |
15.12 |
| 2026-10-08 12:00 |
08:26:03.64 |
+12:47:01.9 |
HIP 41400 |
12.51 |
| 2026-10-09 00:00 |
08:26:14.06 |
+12:46:07.6 |
HIP 41400 |
9.99 |
| 2026-10-09 12:00 |
08:26:24.36 |
+12:45:13.5 |
HIP 41400 |
7.62 |
| 2026-10-10 00:00 |
08:26:34.55 |
+12:44:19.7 |
HIP 41400 |
5.53 |
| 2026-10-10 12:00 |
08:26:44.63 |
+12:43:26.2 |
HIP 41400 |
4.15 |
| 2026-10-11 00:00 |
08:26:54.58 |
+12:42:33.0 |
HIP 41400 |
4.16 |