| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
04:48:46.17 |
+30:25:08.9 |
HIP 22410 |
9.98 |
| 2026-06-03 00:00 |
04:49:17.30 |
+30:26:20.0 |
HIP 22410 |
7.97 |
| 2026-06-03 12:00 |
04:49:48.46 |
+30:27:31.1 |
HIP 22410 |
10.97 |
| 2026-06-04 00:00 |
04:50:19.64 |
+30:28:42.1 |
HIP 22410 |
16.44 |
| 2026-06-04 12:00 |
04:50:50.84 |
+30:29:53.0 |
HIP 22410 |
22.66 |
| 2026-06-05 00:00 |
04:51:22.07 |
+30:31:03.9 |
HIP 22677 |
18.06 |
| 2026-06-05 12:00 |
04:51:53.32 |
+30:32:14.6 |
HIP 22677 |
13.10 |
| 2026-06-06 00:00 |
04:52:24.59 |
+30:33:25.2 |
HIP 22677 |
10.50 |
| 2026-06-06 12:00 |
04:52:55.89 |
+30:34:35.8 |
HIP 22677 |
11.94 |
| 2026-06-07 00:00 |
04:53:27.20 |
+30:35:46.2 |
HIP 22677 |
16.39 |
| 2026-06-07 12:00 |
04:53:58.54 |
+30:36:56.6 |
HIP 22677 |
22.11 |
| 2026-06-08 00:00 |
04:54:29.90 |
+30:38:06.8 |
HIP 22910 |
17.10 |
| 2026-06-08 12:00 |
04:55:01.28 |
+30:39:17.0 |
HIP 22910 |
11.42 |
| 2026-06-09 00:00 |
04:55:32.67 |
+30:40:27.1 |
HIP 22910 |
7.90 |
| 2026-06-09 12:00 |
04:56:04.09 |
+30:41:37.0 |
HIP 22925 |
7.66 |
| 2026-06-10 00:00 |
04:56:35.52 |
+30:42:46.9 |
HIP 22925 |
11.71 |
| 2026-06-10 12:00 |
04:57:06.97 |
+30:43:56.7 |
HIP 23087 |
14.37 |
| 2026-06-11 00:00 |
04:57:38.43 |
+30:45:06.3 |
HIP 23087 |
9.36 |
| 2026-06-11 12:00 |
04:58:09.91 |
+30:46:15.9 |
HIP 23087 |
7.95 |
| 2026-06-12 00:00 |
04:58:41.41 |
+30:47:25.3 |
HIP 23087 |
11.53 |
| 2026-06-12 12:00 |
04:59:12.92 |
+30:48:34.7 |
HIP 23187 |
15.00 |
| 2026-06-13 00:00 |
04:59:44.44 |
+30:49:43.9 |
HIP 23302 |
13.03 |
| 2026-06-13 12:00 |
05:00:15.98 |
+30:50:53.1 |
HIP 23302 |
6.33 |
| 2026-06-14 00:00 |
05:00:47.52 |
+30:52:02.1 |
HIP 23302 |
2.14 |
| 2026-06-14 12:00 |
05:01:19.08 |
+30:53:11.1 |
HIP 23302 |
7.97 |
| 2026-06-15 00:00 |
05:01:50.65 |
+30:54:19.9 |
HIP 23302 |
14.72 |
| 2026-06-15 12:00 |
05:02:22.23 |
+30:55:28.6 |
HIP 23433 |
20.41 |
| 2026-06-16 00:00 |
05:02:53.81 |
+30:56:37.2 |
HIP 23433 |
20.95 |
| 2026-06-16 12:00 |
05:03:25.41 |
+30:57:45.7 |
HIP 23433 |
23.56 |
| 2026-06-17 00:00 |
05:03:57.01 |
+30:58:54.1 |
HIP 23433 |
27.67 |
| 2026-06-17 12:00 |
05:04:28.61 |
+31:00:02.4 |
HIP 23703 |
25.39 |
| 2026-06-18 00:00 |
05:05:00.22 |
+31:01:10.5 |
HIP 23703 |
22.86 |
| 2026-06-18 12:00 |
05:05:31.84 |
+31:02:18.6 |
HIP 23703 |
22.26 |
| 2026-06-19 00:00 |
05:06:03.46 |
+31:03:26.5 |
HIP 23703 |
23.72 |
| 2026-06-19 12:00 |
05:06:35.08 |
+31:04:34.4 |
HIP 23914 |
22.88 |
| 2026-06-20 00:00 |
05:07:06.70 |
+31:05:42.1 |
HIP 23914 |
16.05 |
| 2026-06-20 12:00 |
05:07:38.33 |
+31:06:49.7 |
HIP 23914 |
9.26 |
| 2026-06-21 00:00 |
05:08:09.96 |
+31:07:57.2 |
HIP 23914 |
2.84 |
| 2026-06-21 12:00 |
05:08:41.58 |
+31:09:04.6 |
HIP 23914 |
4.95 |
| 2026-06-22 00:00 |
05:09:13.21 |
+31:10:11.8 |
HIP 23914 |
11.62 |