| 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 |
-0.500 |
| 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) |
| 2026-09-20 00:00 |
15:55:05.97 |
-19:01:26.6 |
HIP 77861 |
17.06 |
| 2026-09-20 12:00 |
15:55:23.93 |
-19:02:35.8 |
HIP 77939 |
21.12 |
| 2026-09-21 00:00 |
15:55:42.02 |
-19:03:45.3 |
HIP 77939 |
21.59 |
| 2026-09-21 12:00 |
15:56:00.22 |
-19:04:54.8 |
HIP 77939 |
22.93 |
| 2026-09-22 00:00 |
15:56:18.53 |
-19:06:04.6 |
HIP 77939 |
25.02 |
| 2026-09-22 12:00 |
15:56:36.96 |
-19:07:14.4 |
HIP 77939 |
27.70 |
| 2026-09-23 00:00 |
15:56:55.51 |
-19:08:24.4 |
HIP 77939 |
30.83 |
| 2026-09-23 12:00 |
15:57:14.16 |
-19:09:34.6 |
HIP 78261 |
31.58 |
| 2026-09-24 00:00 |
15:57:32.94 |
-19:10:44.9 |
HIP 78261 |
27.81 |
| 2026-09-24 12:00 |
15:57:51.82 |
-19:11:55.3 |
HIP 78261 |
24.29 |
| 2026-09-25 00:00 |
15:58:10.81 |
-19:13:05.8 |
HIP 78261 |
21.19 |
| 2026-09-25 12:00 |
15:58:29.92 |
-19:14:16.5 |
HIP 78261 |
18.72 |
| 2026-09-26 00:00 |
15:58:49.13 |
-19:15:27.2 |
HIP 78261 |
17.18 |
| 2026-09-26 12:00 |
15:59:08.46 |
-19:16:38.1 |
HIP 78261 |
16.85 |
| 2026-09-27 00:00 |
15:59:27.89 |
-19:17:49.1 |
HIP 78261 |
17.82 |
| 2026-09-27 12:00 |
15:59:47.43 |
-19:19:00.2 |
HIP 78462 |
18.00 |
| 2026-09-28 00:00 |
16:00:07.08 |
-19:20:11.4 |
HIP 78462 |
13.55 |
| 2026-09-28 12:00 |
16:00:26.83 |
-19:21:22.7 |
HIP 78462 |
9.42 |
| 2026-09-29 00:00 |
16:00:46.69 |
-19:22:34.1 |
HIP 78462 |
6.31 |
| 2026-09-29 12:00 |
16:01:06.66 |
-19:23:45.6 |
HIP 78462 |
6.14 |
| 2026-09-30 00:00 |
16:01:26.73 |
-19:24:57.1 |
HIP 78462 |
9.12 |
| 2026-09-30 12:00 |
16:01:46.90 |
-19:26:08.7 |
HIP 78551 |
6.73 |
| 2026-10-01 00:00 |
16:02:07.18 |
-19:27:20.5 |
HIP 78551 |
1.89 |
| 2026-10-01 12:00 |
16:02:27.56 |
-19:28:32.2 |
HIP 78551 |
3.25 |
| 2026-10-02 00:00 |
16:02:48.04 |
-19:29:44.1 |
HIP 78551 |
8.18 |
| 2026-10-02 12:00 |
16:03:08.62 |
-19:30:56.0 |
HIP 78681 |
9.03 |
| 2026-10-03 00:00 |
16:03:29.30 |
-19:32:08.0 |
HIP 78681 |
4.16 |
| 2026-10-03 12:00 |
16:03:50.09 |
-19:33:20.0 |
HIP 78681 |
1.90 |
| 2026-10-04 00:00 |
16:04:10.97 |
-19:34:32.1 |
HIP 78681 |
6.40 |
| 2026-10-04 12:00 |
16:04:31.95 |
-19:35:44.2 |
HIP 78681 |
11.41 |
| 2026-10-05 00:00 |
16:04:53.03 |
-19:36:56.4 |
HIP 78821 |
13.68 |
| 2026-10-05 12:00 |
16:05:14.21 |
-19:38:08.6 |
HIP 78821 |
10.38 |
| 2026-10-06 00:00 |
16:05:35.49 |
-19:39:20.8 |
HIP 78821 |
9.01 |
| 2026-10-06 12:00 |
16:05:56.86 |
-19:40:33.1 |
HIP 78821 |
10.39 |
| 2026-10-07 00:00 |
16:06:18.32 |
-19:41:45.3 |
HIP 78821 |
13.73 |
| 2026-10-07 12:00 |
16:06:39.88 |
-19:42:57.7 |
HIP 78821 |
18.00 |
| 2026-10-08 00:00 |
16:07:01.54 |
-19:44:10.0 |
HIP 79030 |
19.03 |
| 2026-10-08 12:00 |
16:07:23.29 |
-19:45:22.3 |
HIP 79030 |
15.36 |
| 2026-10-09 00:00 |
16:07:45.13 |
-19:46:34.7 |
HIP 79030 |
12.84 |
| 2026-10-09 12:00 |
16:08:07.06 |
-19:47:47.0 |
HIP 79030 |
12.24 |
| 2026-10-10 00:00 |
16:08:29.09 |
-19:48:59.4 |
HIP 79030 |
13.82 |
| 2026-10-10 12:00 |
16:08:51.20 |
-19:50:11.7 |
HIP 79030 |
17.01 |
| 2026-10-11 00:00 |
16:09:13.40 |
-19:51:24.0 |
HIP 79030 |
21.11 |