281P/MOSS
| Parameter |
Value |
| Designation |
281P/MOSS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-05-12T10:50:03.560640Z |
| Orbit solution date (soln_date, UTC) |
2023-02-22T00:13:23Z |
| Obs used |
101 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-08-05.0000000 |
| e |
0.17340861 |
| q (au) |
4.014306 |
| a (au) |
4.856457 |
| i (deg) |
4.723193 |
| Ω (om, deg) |
87.169629 |
| ω (w, deg) |
26.424564 |
| M (ma, deg) |
334.080407 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.442 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.442 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:06:25.22 |
-18:16:40.3 |
HIP 78984 |
14.40 |
| 2026-02-03 12:00 |
16:06:42.03 |
-18:17:22.9 |
HIP 78984 |
10.47 |
| 2026-02-04 00:00 |
16:06:58.70 |
-18:18:04.9 |
HIP 78984 |
6.71 |
| 2026-02-04 12:00 |
16:07:15.22 |
-18:18:46.3 |
HIP 78984 |
3.58 |
| 2026-02-05 00:00 |
16:07:31.61 |
-18:19:27.3 |
HIP 78984 |
3.50 |
| 2026-02-05 12:00 |
16:07:47.85 |
-18:20:07.7 |
HIP 78984 |
6.51 |
| 2026-02-06 00:00 |
16:08:03.94 |
-18:20:47.6 |
HIP 79048 |
6.27 |
| 2026-02-06 12:00 |
16:08:19.89 |
-18:21:26.9 |
HIP 79048 |
7.52 |
| 2026-02-07 00:00 |
16:08:35.69 |
-18:22:05.7 |
HIP 79048 |
10.13 |
| 2026-02-07 12:00 |
16:08:51.34 |
-18:22:44.0 |
HIP 79048 |
13.30 |
| 2026-02-08 00:00 |
16:09:06.84 |
-18:23:21.7 |
HIP 79203 |
11.87 |
| 2026-02-08 12:00 |
16:09:22.19 |
-18:23:58.9 |
HIP 79203 |
8.62 |
| 2026-02-09 00:00 |
16:09:37.39 |
-18:24:35.6 |
HIP 79203 |
5.95 |
| 2026-02-09 12:00 |
16:09:52.44 |
-18:25:11.7 |
HIP 79203 |
4.82 |
| 2026-02-10 00:00 |
16:10:07.33 |
-18:25:47.3 |
HIP 79203 |
6.07 |
| 2026-02-10 12:00 |
16:10:22.07 |
-18:26:22.4 |
HIP 79203 |
8.70 |
| 2026-02-11 00:00 |
16:10:36.65 |
-18:26:56.9 |
HIP 79203 |
11.78 |
| 2026-02-11 12:00 |
16:10:51.08 |
-18:27:31.0 |
HIP 79203 |
15.01 |
| 2026-02-12 00:00 |
16:11:05.35 |
-18:28:04.4 |
HIP 79203 |
18.29 |
| 2026-02-12 12:00 |
16:11:19.46 |
-18:28:37.4 |
HIP 79377 |
17.87 |
| 2026-02-13 00:00 |
16:11:33.41 |
-18:29:09.8 |
HIP 79377 |
16.70 |
| 2026-02-13 12:00 |
16:11:47.19 |
-18:29:41.7 |
HIP 79377 |
16.15 |
| 2026-02-14 00:00 |
16:12:00.82 |
-18:30:13.1 |
HIP 79377 |
16.27 |
| 2026-02-14 12:00 |
16:12:14.28 |
-18:30:43.9 |
HIP 79377 |
17.01 |
| 2026-02-15 00:00 |
16:12:27.58 |
-18:31:14.3 |
HIP 79377 |
18.29 |
| 2026-02-15 12:00 |
16:12:40.72 |
-18:31:44.1 |
HIP 79377 |
19.97 |
| 2026-02-16 00:00 |
16:12:53.68 |
-18:32:13.3 |
HIP 79431 |
20.47 |
| 2026-02-16 12:00 |
16:13:06.49 |
-18:32:42.1 |
HIP 79431 |
20.65 |
| 2026-02-17 00:00 |
16:13:19.12 |
-18:33:10.3 |
HIP 79605 |
19.03 |
| 2026-02-17 12:00 |
16:13:31.58 |
-18:33:38.0 |
HIP 79605 |
16.12 |
| 2026-02-18 00:00 |
16:13:43.88 |
-18:34:05.2 |
HIP 79605 |
13.28 |
| 2026-02-18 12:00 |
16:13:56.00 |
-18:34:31.9 |
HIP 79605 |
10.54 |
| 2026-02-19 00:00 |
16:14:07.95 |
-18:34:58.1 |
HIP 79605 |
7.96 |
| 2026-02-19 12:00 |
16:14:19.73 |
-18:35:23.7 |
HIP 79605 |
5.68 |
| 2026-02-20 00:00 |
16:14:31.33 |
-18:35:48.8 |
HIP 79605 |
4.15 |
| 2026-02-20 12:00 |
16:14:42.76 |
-18:36:13.4 |
HIP 79605 |
4.18 |
| 2026-02-21 00:00 |
16:14:54.02 |
-18:36:37.5 |
HIP 79605 |
5.70 |
| 2026-02-21 12:00 |
16:15:05.10 |
-18:37:01.1 |
HIP 79605 |
7.83 |
| 2026-02-22 00:00 |
16:15:16.00 |
-18:37:24.2 |
HIP 79605 |
10.18 |
| 2026-02-22 12:00 |
16:15:26.73 |
-18:37:46.8 |
HIP 79605 |
12.58 |
| 2026-02-23 00:00 |
16:15:37.27 |
-18:38:08.9 |
HIP 79732 |
10.46 |
| 2026-02-23 12:00 |
16:15:47.64 |
-18:38:30.4 |
HIP 79732 |
8.18 |
| 2026-02-24 00:00 |
16:15:57.83 |
-18:38:51.5 |
HIP 79732 |
6.10 |