| Parameter |
Value |
| Designation |
413P/Larson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-19T07:08:45.504960Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:49Z |
| Obs used |
818 |
| NEO |
- |
| M1 |
14.000 |
| K1 |
9.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-25T04:11:40.128000Z |
| Discovery magnitude (MPC) |
20.50 T |
| Discovery observatory (MPC) |
Z84 · Calar Alto-Schmidt |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-01-12.0000000 |
| e |
0.42384746 |
| q (au) |
2.139804 |
| a (au) |
3.713954 |
| i (deg) |
15.984004 |
| Ω (om, deg) |
39.063272 |
| ω (w, deg) |
185.901501 |
| M (ma, deg) |
183.145966 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.069 + 3.557\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.069 |
| n |
3.557 |
| gf |
1.000 |
| gb |
-0.559 |
| 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) |
| 2026-05-12 00:00 |
04:27:00.04 |
+29:33:10.4 |
HIP 20663 |
17.86 |
| 2026-05-12 12:00 |
04:27:29.49 |
+29:34:23.5 |
HIP 20728 |
22.56 |
| 2026-05-13 00:00 |
04:27:58.99 |
+29:35:36.7 |
HIP 20728 |
27.58 |
| 2026-05-13 12:00 |
04:28:28.55 |
+29:36:49.8 |
HIP 20728 |
33.14 |
| 2026-05-14 00:00 |
04:28:58.16 |
+29:38:03.0 |
HIP 20989 |
38.34 |
| 2026-05-14 12:00 |
04:29:27.82 |
+29:39:16.2 |
HIP 21122 |
32.29 |
| 2026-05-15 00:00 |
04:29:57.54 |
+29:40:29.3 |
HIP 21122 |
26.21 |
| 2026-05-15 12:00 |
04:30:27.30 |
+29:41:42.5 |
HIP 21122 |
20.42 |
| 2026-05-16 00:00 |
04:30:57.12 |
+29:42:55.6 |
HIP 21122 |
15.27 |
| 2026-05-16 12:00 |
04:31:26.98 |
+29:44:08.7 |
HIP 21122 |
11.66 |
| 2026-05-17 00:00 |
04:31:56.89 |
+29:45:21.8 |
HIP 21122 |
11.21 |
| 2026-05-17 12:00 |
04:32:26.85 |
+29:46:34.9 |
HIP 21122 |
14.24 |
| 2026-05-18 00:00 |
04:32:56.86 |
+29:47:48.0 |
HIP 21122 |
19.17 |
| 2026-05-18 12:00 |
04:33:26.91 |
+29:49:01.0 |
HIP 21373 |
22.94 |
| 2026-05-19 00:00 |
04:33:57.01 |
+29:50:14.0 |
HIP 21373 |
16.33 |
| 2026-05-19 12:00 |
04:34:27.15 |
+29:51:27.0 |
HIP 21373 |
9.76 |
| 2026-05-20 00:00 |
04:34:57.33 |
+29:52:39.9 |
HIP 21373 |
3.49 |
| 2026-05-20 12:00 |
04:35:27.56 |
+29:53:52.8 |
HIP 21373 |
4.22 |
| 2026-05-21 00:00 |
04:35:57.83 |
+29:55:05.7 |
HIP 21373 |
10.60 |
| 2026-05-21 12:00 |
04:36:28.14 |
+29:56:18.5 |
HIP 21373 |
17.21 |
| 2026-05-22 00:00 |
04:36:58.49 |
+29:57:31.3 |
HIP 21373 |
23.87 |
| 2026-05-22 12:00 |
04:37:28.88 |
+29:58:44.1 |
HIP 21516 |
25.47 |
| 2026-05-23 00:00 |
04:37:59.30 |
+29:59:56.8 |
HIP 21566 |
24.70 |
| 2026-05-23 12:00 |
04:38:29.77 |
+30:01:09.4 |
HIP 21760 |
24.60 |
| 2026-05-24 00:00 |
04:39:00.27 |
+30:02:22.0 |
HIP 21760 |
18.28 |
| 2026-05-24 12:00 |
04:39:30.82 |
+30:03:34.5 |
HIP 21760 |
12.38 |
| 2026-05-25 00:00 |
04:40:01.39 |
+30:04:47.0 |
HIP 21760 |
7.92 |
| 2026-05-25 12:00 |
04:40:32.00 |
+30:05:59.4 |
HIP 21760 |
7.91 |
| 2026-05-26 00:00 |
04:41:02.65 |
+30:07:11.8 |
HIP 21783 |
10.86 |
| 2026-05-26 12:00 |
04:41:33.33 |
+30:08:24.1 |
HIP 21783 |
13.56 |
| 2026-05-27 00:00 |
04:42:04.05 |
+30:09:36.4 |
HIP 21783 |
18.46 |
| 2026-05-27 12:00 |
04:42:34.80 |
+30:10:48.5 |
HIP 21783 |
24.27 |
| 2026-05-28 00:00 |
04:43:05.58 |
+30:12:00.6 |
HIP 21783 |
30.47 |
| 2026-05-28 12:00 |
04:43:36.39 |
+30:13:12.7 |
HIP 22108 |
24.55 |
| 2026-05-29 00:00 |
04:44:07.24 |
+30:14:24.6 |
HIP 22108 |
17.78 |
| 2026-05-29 12:00 |
04:44:38.12 |
+30:15:36.5 |
HIP 22108 |
11.01 |
| 2026-05-30 00:00 |
04:45:09.02 |
+30:16:48.3 |
HIP 22108 |
4.26 |
| 2026-05-30 12:00 |
04:45:39.96 |
+30:18:00.1 |
HIP 22108 |
2.65 |
| 2026-05-31 00:00 |
04:46:10.92 |
+30:19:11.7 |
HIP 22108 |
9.38 |
| 2026-05-31 12:00 |
04:46:41.92 |
+30:20:23.3 |
HIP 22108 |
16.17 |
| 2026-06-01 00:00 |
04:47:12.94 |
+30:21:34.8 |
HIP 22108 |
22.96 |
| 2026-06-01 12:00 |
04:47:43.99 |
+30:22:46.3 |
HIP 22410 |
21.23 |
| 2026-06-02 00:00 |
04:48:15.07 |
+30:23:57.6 |
HIP 22410 |
15.12 |