| 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) |
| 2026-07-29 00:00 |
17:20:04.96 |
-35:08:34.9 |
HIP 84709 |
16.79 |
| 2026-07-29 12:00 |
17:19:54.89 |
-35:07:48.2 |
HIP 84709 |
14.65 |
| 2026-07-30 00:00 |
17:19:44.98 |
-35:07:01.3 |
HIP 84709 |
12.55 |
| 2026-07-30 12:00 |
17:19:35.23 |
-35:06:14.1 |
HIP 84709 |
10.51 |
| 2026-07-31 00:00 |
17:19:25.65 |
-35:05:26.8 |
HIP 84709 |
8.53 |
| 2026-07-31 12:00 |
17:19:16.24 |
-35:04:39.2 |
HIP 84709 |
6.67 |
| 2026-08-01 00:00 |
17:19:06.99 |
-35:03:51.5 |
HIP 84709 |
4.98 |
| 2026-08-01 12:00 |
17:18:57.91 |
-35:03:03.5 |
HIP 84709 |
3.70 |
| 2026-08-02 00:00 |
17:18:49.01 |
-35:02:15.4 |
HIP 84709 |
3.25 |
| 2026-08-02 12:00 |
17:18:40.27 |
-35:01:27.1 |
HIP 84709 |
3.90 |
| 2026-08-03 00:00 |
17:18:31.70 |
-35:00:38.6 |
HIP 84709 |
5.21 |
| 2026-08-03 12:00 |
17:18:23.31 |
-34:59:50.0 |
HIP 84709 |
6.78 |
| 2026-08-04 00:00 |
17:18:15.09 |
-34:59:01.3 |
HIP 84709 |
8.46 |
| 2026-08-04 12:00 |
17:18:07.05 |
-34:58:12.4 |
HIP 84709 |
10.17 |
| 2026-08-05 00:00 |
17:17:59.17 |
-34:57:23.3 |
HIP 84709 |
11.88 |
| 2026-08-05 12:00 |
17:17:51.48 |
-34:56:34.2 |
HIP 84709 |
13.59 |
| 2026-08-06 00:00 |
17:17:43.96 |
-34:55:44.9 |
HIP 84709 |
15.27 |
| 2026-08-06 12:00 |
17:17:36.62 |
-34:54:55.6 |
HIP 84709 |
16.93 |
| 2026-08-07 00:00 |
17:17:29.45 |
-34:54:06.1 |
HIP 84709 |
18.57 |
| 2026-08-07 12:00 |
17:17:22.46 |
-34:53:16.5 |
HIP 84438 |
19.82 |
| 2026-08-08 00:00 |
17:17:15.66 |
-34:52:26.8 |
HIP 84438 |
18.59 |
| 2026-08-08 12:00 |
17:17:09.03 |
-34:51:37.1 |
HIP 84438 |
17.48 |
| 2026-08-09 00:00 |
17:17:02.58 |
-34:50:47.3 |
HIP 84438 |
16.47 |
| 2026-08-09 12:00 |
17:16:56.32 |
-34:49:57.4 |
HIP 84438 |
15.59 |
| 2026-08-10 00:00 |
17:16:50.23 |
-34:49:07.5 |
HIP 84438 |
14.85 |
| 2026-08-10 12:00 |
17:16:44.33 |
-34:48:17.5 |
HIP 84438 |
14.26 |
| 2026-08-11 00:00 |
17:16:38.61 |
-34:47:27.5 |
HIP 84438 |
13.83 |
| 2026-08-11 12:00 |
17:16:33.08 |
-34:46:37.4 |
HIP 84438 |
13.56 |
| 2026-08-12 00:00 |
17:16:27.73 |
-34:45:47.4 |
HIP 84438 |
13.47 |
| 2026-08-12 12:00 |
17:16:22.56 |
-34:44:57.2 |
HIP 84438 |
13.53 |
| 2026-08-13 00:00 |
17:16:17.58 |
-34:44:07.1 |
HIP 84438 |
13.74 |
| 2026-08-13 12:00 |
17:16:12.79 |
-34:43:17.0 |
HIP 84438 |
14.09 |
| 2026-08-14 00:00 |
17:16:08.18 |
-34:42:26.9 |
HIP 84438 |
14.56 |
| 2026-08-14 12:00 |
17:16:03.76 |
-34:41:36.8 |
HIP 84438 |
15.13 |
| 2026-08-15 00:00 |
17:15:59.53 |
-34:40:46.7 |
HIP 84438 |
15.78 |
| 2026-08-15 12:00 |
17:15:55.48 |
-34:39:56.6 |
HIP 84438 |
16.49 |
| 2026-08-16 00:00 |
17:15:51.62 |
-34:39:06.5 |
HIP 84438 |
17.26 |
| 2026-08-16 12:00 |
17:15:47.94 |
-34:38:16.5 |
HIP 84429 |
17.22 |
| 2026-08-17 00:00 |
17:15:44.46 |
-34:37:26.5 |
HIP 84429 |
16.33 |
| 2026-08-17 12:00 |
17:15:41.16 |
-34:36:36.6 |
HIP 84429 |
15.48 |
| 2026-08-18 00:00 |
17:15:38.05 |
-34:35:46.7 |
HIP 84429 |
14.65 |
| 2026-08-18 12:00 |
17:15:35.12 |
-34:34:56.8 |
HIP 84429 |
13.85 |
| 2026-08-19 00:00 |
17:15:32.38 |
-34:34:07.1 |
HIP 84429 |
13.07 |