374P/Larson
| 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) |
| 2026-02-03 00:00 |
17:43:03.88 |
-32:47:38.8 |
HIP 86751 |
10.27 |
| 2026-02-03 12:00 |
17:43:22.28 |
-32:48:16.8 |
HIP 86751 |
8.94 |
| 2026-02-04 00:00 |
17:43:40.60 |
-32:48:54.8 |
HIP 86751 |
9.22 |
| 2026-02-04 12:00 |
17:43:58.83 |
-32:49:33.0 |
HIP 86751 |
10.97 |
| 2026-02-05 00:00 |
17:44:16.97 |
-32:50:11.2 |
HIP 86751 |
13.63 |
| 2026-02-05 12:00 |
17:44:35.03 |
-32:50:49.5 |
HIP 86751 |
16.75 |
| 2026-02-06 00:00 |
17:44:52.99 |
-32:51:27.9 |
HIP 86751 |
20.11 |
| 2026-02-06 12:00 |
17:45:10.87 |
-32:52:06.4 |
HIP 86751 |
23.60 |
| 2026-02-07 00:00 |
17:45:28.66 |
-32:52:45.0 |
HIP 86892 |
26.09 |
| 2026-02-07 12:00 |
17:45:46.35 |
-32:53:23.7 |
HIP 86892 |
26.09 |
| 2026-02-08 00:00 |
17:46:03.96 |
-32:54:02.5 |
HIP 86892 |
26.62 |
| 2026-02-08 12:00 |
17:46:21.47 |
-32:54:41.4 |
HIP 86892 |
27.63 |
| 2026-02-09 00:00 |
17:46:38.89 |
-32:55:20.4 |
HIP 87144 |
25.51 |
| 2026-02-09 12:00 |
17:46:56.21 |
-32:55:59.4 |
HIP 87144 |
23.11 |
| 2026-02-10 00:00 |
17:47:13.44 |
-32:56:38.6 |
HIP 87144 |
21.11 |
| 2026-02-10 12:00 |
17:47:30.57 |
-32:57:17.9 |
HIP 87144 |
19.61 |
| 2026-02-11 00:00 |
17:47:47.60 |
-32:57:57.3 |
HIP 87144 |
18.73 |
| 2026-02-11 12:00 |
17:48:04.53 |
-32:58:36.7 |
HIP 87144 |
18.53 |
| 2026-02-12 00:00 |
17:48:21.37 |
-32:59:16.3 |
HIP 87221 |
18.86 |
| 2026-02-12 12:00 |
17:48:38.10 |
-32:59:56.0 |
HIP 87221 |
16.58 |
| 2026-02-13 00:00 |
17:48:54.73 |
-33:00:35.8 |
HIP 87221 |
14.81 |
| 2026-02-13 12:00 |
17:49:11.26 |
-33:01:15.7 |
HIP 87221 |
13.75 |
| 2026-02-14 00:00 |
17:49:27.68 |
-33:01:55.7 |
HIP 87221 |
13.54 |
| 2026-02-14 12:00 |
17:49:44.01 |
-33:02:35.8 |
HIP 87221 |
14.21 |
| 2026-02-15 00:00 |
17:50:00.22 |
-33:03:16.1 |
HIP 87361 |
13.77 |
| 2026-02-15 12:00 |
17:50:16.33 |
-33:03:56.4 |
HIP 87361 |
10.84 |
| 2026-02-16 00:00 |
17:50:32.33 |
-33:04:36.9 |
HIP 87361 |
8.33 |
| 2026-02-16 12:00 |
17:50:48.23 |
-33:05:17.5 |
HIP 87361 |
6.70 |
| 2026-02-17 00:00 |
17:51:04.01 |
-33:05:58.1 |
HIP 87361 |
6.60 |
| 2026-02-17 12:00 |
17:51:19.68 |
-33:06:38.9 |
HIP 87361 |
8.05 |
| 2026-02-18 00:00 |
17:51:35.25 |
-33:07:19.9 |
HIP 87361 |
10.41 |
| 2026-02-18 12:00 |
17:51:50.70 |
-33:08:00.9 |
HIP 87361 |
13.18 |
| 2026-02-19 00:00 |
17:52:06.03 |
-33:08:42.0 |
HIP 87361 |
16.13 |
| 2026-02-19 12:00 |
17:52:21.26 |
-33:09:23.3 |
HIP 87361 |
19.17 |
| 2026-02-20 00:00 |
17:52:36.37 |
-33:10:04.7 |
HIP 87361 |
22.26 |
| 2026-02-20 12:00 |
17:52:51.36 |
-33:10:46.2 |
HIP 87361 |
25.36 |
| 2026-02-21 00:00 |
17:53:06.23 |
-33:11:27.9 |
HIP 87361 |
28.46 |
| 2026-02-21 12:00 |
17:53:20.99 |
-33:12:09.6 |
HIP 87664 |
28.21 |
| 2026-02-22 00:00 |
17:53:35.63 |
-33:12:51.5 |
HIP 87664 |
26.27 |
| 2026-02-22 12:00 |
17:53:50.15 |
-33:13:33.5 |
HIP 87664 |
24.59 |
| 2026-02-23 00:00 |
17:54:04.55 |
-33:14:15.6 |
HIP 87664 |
23.21 |
| 2026-02-23 12:00 |
17:54:18.83 |
-33:14:57.9 |
HIP 87664 |
22.17 |
| 2026-02-24 00:00 |
17:54:32.99 |
-33:15:40.3 |
HIP 87664 |
21.51 |