| Parameter |
Value |
| Designation |
200P/Larsen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-08-25T00:09:36.175680Z |
| Orbit solution date (soln_date, UTC) |
2022-02-03T20:43:19Z |
| Obs used |
610 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
17.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-01-06.0000000 |
| e |
0.33323678 |
| q (au) |
3.272199 |
| a (au) |
4.907588 |
| i (deg) |
12.121060 |
| Ω (om, deg) |
234.819218 |
| ω (w, deg) |
133.693288 |
| M (ma, deg) |
338.966942 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.603 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.603 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| 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 |
13:33:07.46 |
-15:10:48.7 |
HIP 66091 |
11.61 |
| 2026-06-01 12:00 |
13:33:00.09 |
-15:09:25.4 |
HIP 66091 |
12.52 |
| 2026-06-02 00:00 |
13:32:52.86 |
-15:08:02.7 |
HIP 66091 |
13.74 |
| 2026-06-02 12:00 |
13:32:45.77 |
-15:06:40.7 |
HIP 66091 |
15.17 |
| 2026-06-03 00:00 |
13:32:38.81 |
-15:05:19.3 |
HIP 66091 |
16.75 |
| 2026-06-03 12:00 |
13:32:32.00 |
-15:03:58.6 |
HIP 65983 |
17.72 |
| 2026-06-04 00:00 |
13:32:25.32 |
-15:02:38.5 |
HIP 65983 |
17.68 |
| 2026-06-04 12:00 |
13:32:18.78 |
-15:01:19.2 |
HIP 65983 |
17.89 |
| 2026-06-05 00:00 |
13:32:12.37 |
-15:00:00.5 |
HIP 65983 |
18.33 |
| 2026-06-05 12:00 |
13:32:06.11 |
-14:58:42.6 |
HIP 65983 |
18.98 |
| 2026-06-06 00:00 |
13:32:00.00 |
-14:57:25.3 |
HIP 65983 |
19.80 |
| 2026-06-06 12:00 |
13:31:54.02 |
-14:56:08.7 |
HIP 65983 |
20.77 |
| 2026-06-07 00:00 |
13:31:48.18 |
-14:54:52.9 |
HIP 65983 |
21.86 |
| 2026-06-07 12:00 |
13:31:42.49 |
-14:53:37.8 |
HIP 65983 |
23.05 |
| 2026-06-08 00:00 |
13:31:36.95 |
-14:52:23.4 |
HIP 65983 |
24.30 |
| 2026-06-08 12:00 |
13:31:31.54 |
-14:51:09.8 |
HIP 65983 |
25.61 |
| 2026-06-09 00:00 |
13:31:26.28 |
-14:49:56.9 |
HIP 65983 |
26.95 |
| 2026-06-09 12:00 |
13:31:21.17 |
-14:48:44.8 |
HIP 65845 |
27.29 |
| 2026-06-10 00:00 |
13:31:16.20 |
-14:47:33.4 |
HIP 65845 |
27.10 |
| 2026-06-10 12:00 |
13:31:11.38 |
-14:46:22.8 |
HIP 65845 |
27.04 |
| 2026-06-11 00:00 |
13:31:06.70 |
-14:45:13.0 |
HIP 65845 |
27.09 |
| 2026-06-11 12:00 |
13:31:02.18 |
-14:44:03.9 |
HIP 65845 |
27.24 |
| 2026-06-12 00:00 |
13:30:57.80 |
-14:42:55.7 |
HIP 65845 |
27.50 |
| 2026-06-12 12:00 |
13:30:53.56 |
-14:41:48.2 |
HIP 65845 |
27.86 |
| 2026-06-13 00:00 |
13:30:49.48 |
-14:40:41.5 |
HIP 65845 |
28.29 |
| 2026-06-13 12:00 |
13:30:45.55 |
-14:39:35.7 |
HIP 65845 |
28.80 |
| 2026-06-14 00:00 |
13:30:41.76 |
-14:38:30.6 |
HIP 65845 |
29.38 |
| 2026-06-14 12:00 |
13:30:38.13 |
-14:37:26.4 |
HIP 65845 |
30.01 |
| 2026-06-15 00:00 |
13:30:34.65 |
-14:36:23.0 |
HIP 65845 |
30.69 |
| 2026-06-15 12:00 |
13:30:31.31 |
-14:35:20.4 |
HIP 65845 |
31.41 |
| 2026-06-16 00:00 |
13:30:28.13 |
-14:34:18.7 |
HIP 65845 |
32.17 |
| 2026-06-16 12:00 |
13:30:25.10 |
-14:33:17.8 |
HIP 65845 |
32.96 |
| 2026-06-17 00:00 |
13:30:22.22 |
-14:32:17.7 |
HIP 65856 |
32.72 |
| 2026-06-17 12:00 |
13:30:19.49 |
-14:31:18.5 |
HIP 65856 |
31.63 |
| 2026-06-18 00:00 |
13:30:16.92 |
-14:30:20.2 |
HIP 65856 |
30.58 |
| 2026-06-18 12:00 |
13:30:14.49 |
-14:29:22.7 |
HIP 65856 |
29.54 |
| 2026-06-19 00:00 |
13:30:12.22 |
-14:28:26.0 |
HIP 65856 |
28.54 |
| 2026-06-19 12:00 |
13:30:10.10 |
-14:27:30.2 |
HIP 65856 |
27.56 |
| 2026-06-20 00:00 |
13:30:08.14 |
-14:26:35.3 |
HIP 65856 |
26.60 |
| 2026-06-20 12:00 |
13:30:06.32 |
-14:25:41.3 |
HIP 65856 |
25.67 |
| 2026-06-21 00:00 |
13:30:04.66 |
-14:24:48.1 |
HIP 65856 |
24.76 |
| 2026-06-21 12:00 |
13:30:03.15 |
-14:23:55.8 |
HIP 65856 |
23.87 |
| 2026-06-22 00:00 |
13:30:01.79 |
-14:23:04.4 |
HIP 65856 |
23.00 |