| Parameter |
Value |
| Designation |
374P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-12-09T18:00:31.363200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:38Z |
| Obs used |
286 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
23.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-05-22.0000000 |
| e |
0.46250522 |
| q (au) |
2.670592 |
| a (au) |
4.968591 |
| i (deg) |
10.790852 |
| Ω (om, deg) |
8.161322 |
| ω (w, deg) |
51.420244 |
| M (ma, deg) |
112.063968 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.335 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.335 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.533 |
| k |
0.800 |
| 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 |
17:18:58.14 |
-33:46:24.7 |
HIP 84685 |
20.14 |
| 2026-09-20 12:00 |
17:19:07.05 |
-33:45:47.1 |
HIP 84685 |
19.88 |
| 2026-09-21 00:00 |
17:19:16.12 |
-33:45:09.6 |
HIP 84685 |
19.83 |
| 2026-09-21 12:00 |
17:19:25.35 |
-33:44:32.5 |
HIP 84685 |
20.00 |
| 2026-09-22 00:00 |
17:19:34.75 |
-33:43:55.5 |
HIP 84685 |
20.39 |
| 2026-09-22 12:00 |
17:19:44.30 |
-33:43:18.8 |
HIP 84685 |
21.00 |
| 2026-09-23 00:00 |
17:19:54.02 |
-33:42:42.4 |
HIP 84685 |
21.82 |
| 2026-09-23 12:00 |
17:20:03.89 |
-33:42:06.2 |
HIP 84685 |
22.83 |
| 2026-09-24 00:00 |
17:20:13.93 |
-33:41:30.3 |
HIP 84685 |
24.02 |
| 2026-09-24 12:00 |
17:20:24.12 |
-33:40:54.6 |
HIP 84966 |
25.32 |
| 2026-09-25 00:00 |
17:20:34.46 |
-33:40:19.2 |
HIP 84966 |
23.30 |
| 2026-09-25 12:00 |
17:20:44.96 |
-33:39:44.0 |
HIP 84966 |
21.30 |
| 2026-09-26 00:00 |
17:20:55.62 |
-33:39:09.1 |
HIP 84966 |
19.33 |
| 2026-09-26 12:00 |
17:21:06.43 |
-33:38:34.4 |
HIP 84966 |
17.43 |
| 2026-09-27 00:00 |
17:21:17.40 |
-33:38:00.0 |
HIP 84966 |
15.64 |
| 2026-09-27 12:00 |
17:21:28.51 |
-33:37:25.8 |
HIP 84966 |
13.99 |
| 2026-09-28 00:00 |
17:21:39.78 |
-33:36:51.8 |
HIP 84966 |
12.59 |
| 2026-09-28 12:00 |
17:21:51.21 |
-33:36:18.1 |
HIP 84966 |
11.52 |
| 2026-09-29 00:00 |
17:22:02.78 |
-33:35:44.6 |
HIP 84966 |
10.91 |
| 2026-09-29 12:00 |
17:22:14.50 |
-33:35:11.4 |
HIP 84966 |
10.86 |
| 2026-09-30 00:00 |
17:22:26.37 |
-33:34:38.5 |
HIP 84966 |
11.40 |
| 2026-09-30 12:00 |
17:22:38.40 |
-33:34:05.7 |
HIP 84966 |
12.47 |
| 2026-10-01 00:00 |
17:22:50.57 |
-33:33:33.2 |
HIP 84966 |
13.95 |
| 2026-10-01 12:00 |
17:23:02.88 |
-33:33:01.0 |
HIP 84966 |
15.76 |
| 2026-10-02 00:00 |
17:23:15.35 |
-33:32:29.0 |
HIP 85082 |
16.71 |
| 2026-10-02 12:00 |
17:23:27.96 |
-33:31:57.2 |
HIP 85082 |
17.36 |
| 2026-10-03 00:00 |
17:23:40.72 |
-33:31:25.7 |
HIP 85082 |
18.39 |
| 2026-10-03 12:00 |
17:23:53.62 |
-33:30:54.4 |
HIP 85082 |
19.74 |
| 2026-10-04 00:00 |
17:24:06.67 |
-33:30:23.3 |
HIP 85082 |
21.37 |
| 2026-10-04 12:00 |
17:24:19.86 |
-33:29:52.5 |
HIP 85082 |
23.23 |
| 2026-10-05 00:00 |
17:24:33.19 |
-33:29:21.9 |
HIP 85082 |
25.28 |
| 2026-10-05 12:00 |
17:24:46.67 |
-33:28:51.5 |
HIP 85082 |
27.48 |
| 2026-10-06 00:00 |
17:25:00.29 |
-33:28:21.4 |
HIP 85375 |
29.49 |
| 2026-10-06 12:00 |
17:25:14.05 |
-33:27:51.5 |
HIP 85375 |
27.87 |
| 2026-10-07 00:00 |
17:25:27.95 |
-33:27:21.9 |
HIP 85375 |
26.46 |
| 2026-10-07 12:00 |
17:25:41.99 |
-33:26:52.4 |
HIP 85375 |
25.29 |
| 2026-10-08 00:00 |
17:25:56.17 |
-33:26:23.2 |
HIP 85375 |
24.41 |
| 2026-10-08 12:00 |
17:26:10.49 |
-33:25:54.2 |
HIP 85375 |
23.86 |
| 2026-10-09 00:00 |
17:26:24.95 |
-33:25:25.5 |
HIP 85375 |
23.68 |
| 2026-10-09 12:00 |
17:26:39.54 |
-33:24:56.9 |
HIP 85375 |
23.89 |
| 2026-10-10 00:00 |
17:26:54.27 |
-33:24:28.6 |
HIP 85375 |
24.49 |
| 2026-10-10 12:00 |
17:27:09.13 |
-33:24:00.6 |
HIP 85375 |
25.45 |
| 2026-10-11 00:00 |
17:27:24.13 |
-33:23:32.7 |
HIP 85375 |
26.75 |