| 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) |
| 2026-03-26 00:00 |
18:04:29.86 |
-34:02:08.3 |
HIP 88492 |
4.41 |
| 2026-03-26 12:00 |
18:04:35.09 |
-34:02:58.7 |
HIP 88492 |
5.37 |
| 2026-03-27 00:00 |
18:04:40.15 |
-34:03:49.1 |
HIP 88492 |
6.45 |
| 2026-03-27 12:00 |
18:04:45.05 |
-34:04:39.7 |
HIP 88492 |
7.57 |
| 2026-03-28 00:00 |
18:04:49.77 |
-34:05:30.4 |
HIP 88492 |
8.72 |
| 2026-03-28 12:00 |
18:04:54.32 |
-34:06:21.2 |
HIP 88492 |
9.87 |
| 2026-03-29 00:00 |
18:04:58.70 |
-34:07:12.1 |
HIP 88492 |
11.01 |
| 2026-03-29 12:00 |
18:05:02.91 |
-34:08:03.1 |
HIP 88492 |
12.14 |
| 2026-03-30 00:00 |
18:05:06.95 |
-34:08:54.2 |
HIP 88492 |
13.26 |
| 2026-03-30 12:00 |
18:05:10.82 |
-34:09:45.4 |
HIP 88492 |
14.35 |
| 2026-03-31 00:00 |
18:05:14.51 |
-34:10:36.6 |
HIP 88492 |
15.43 |
| 2026-03-31 12:00 |
18:05:18.04 |
-34:11:27.9 |
HIP 88691 |
14.93 |
| 2026-04-01 00:00 |
18:05:21.38 |
-34:12:19.4 |
HIP 88691 |
13.91 |
| 2026-04-01 12:00 |
18:05:24.56 |
-34:13:10.9 |
HIP 88691 |
12.93 |
| 2026-04-02 00:00 |
18:05:27.56 |
-34:14:02.4 |
HIP 88691 |
12.01 |
| 2026-04-02 12:00 |
18:05:30.38 |
-34:14:54.1 |
HIP 88691 |
11.14 |
| 2026-04-03 00:00 |
18:05:33.03 |
-34:15:45.8 |
HIP 88691 |
10.33 |
| 2026-04-03 12:00 |
18:05:35.51 |
-34:16:37.6 |
HIP 88691 |
9.61 |
| 2026-04-04 00:00 |
18:05:37.81 |
-34:17:29.5 |
HIP 88691 |
8.97 |
| 2026-04-04 12:00 |
18:05:39.93 |
-34:18:21.4 |
HIP 88691 |
8.44 |
| 2026-04-05 00:00 |
18:05:41.87 |
-34:19:13.4 |
HIP 88691 |
8.02 |
| 2026-04-05 12:00 |
18:05:43.64 |
-34:20:05.4 |
HIP 88691 |
7.74 |
| 2026-04-06 00:00 |
18:05:45.22 |
-34:20:57.5 |
HIP 88691 |
7.61 |
| 2026-04-06 12:00 |
18:05:46.63 |
-34:21:49.6 |
HIP 88691 |
7.62 |
| 2026-04-07 00:00 |
18:05:47.86 |
-34:22:41.8 |
HIP 88691 |
7.77 |
| 2026-04-07 12:00 |
18:05:48.91 |
-34:23:34.0 |
HIP 88691 |
8.05 |
| 2026-04-08 00:00 |
18:05:49.78 |
-34:24:26.3 |
HIP 88691 |
8.45 |
| 2026-04-08 12:00 |
18:05:50.47 |
-34:25:18.6 |
HIP 88691 |
8.94 |
| 2026-04-09 00:00 |
18:05:50.98 |
-34:26:10.9 |
HIP 88691 |
9.52 |
| 2026-04-09 12:00 |
18:05:51.31 |
-34:27:03.3 |
HIP 88691 |
10.16 |
| 2026-04-10 00:00 |
18:05:51.46 |
-34:27:55.7 |
HIP 88691 |
10.85 |
| 2026-04-10 12:00 |
18:05:51.42 |
-34:28:48.1 |
HIP 88691 |
11.59 |
| 2026-04-11 00:00 |
18:05:51.20 |
-34:29:40.5 |
HIP 88691 |
12.37 |
| 2026-04-11 12:00 |
18:05:50.80 |
-34:30:32.9 |
HIP 88691 |
13.18 |
| 2026-04-12 00:00 |
18:05:50.22 |
-34:31:25.4 |
HIP 88691 |
14.01 |
| 2026-04-12 12:00 |
18:05:49.46 |
-34:32:17.8 |
HIP 88691 |
14.86 |
| 2026-04-13 00:00 |
18:05:48.51 |
-34:33:10.3 |
HIP 88691 |
15.73 |
| 2026-04-13 12:00 |
18:05:47.37 |
-34:34:02.7 |
HIP 88542 |
15.51 |
| 2026-04-14 00:00 |
18:05:46.06 |
-34:34:55.1 |
HIP 88542 |
14.76 |
| 2026-04-14 12:00 |
18:05:44.55 |
-34:35:47.5 |
HIP 88542 |
14.00 |
| 2026-04-15 00:00 |
18:05:42.87 |
-34:36:39.9 |
HIP 88542 |
13.22 |
| 2026-04-15 12:00 |
18:05:41.00 |
-34:37:32.2 |
HIP 88542 |
12.44 |
| 2026-04-16 00:00 |
18:05:38.95 |
-34:38:24.6 |
HIP 88542 |
11.65 |