| 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) |
| 2026-05-12 00:00 |
16:04:35.52 |
-18:07:37.8 |
HIP 78785 |
25.58 |
| 2026-05-12 12:00 |
16:04:19.47 |
-18:07:02.2 |
HIP 78573 |
24.21 |
| 2026-05-13 00:00 |
16:04:03.37 |
-18:06:26.6 |
HIP 78573 |
20.53 |
| 2026-05-13 12:00 |
16:03:47.21 |
-18:05:50.8 |
HIP 78573 |
16.92 |
| 2026-05-14 00:00 |
16:03:31.01 |
-18:05:15.0 |
HIP 78573 |
13.46 |
| 2026-05-14 12:00 |
16:03:14.75 |
-18:04:39.2 |
HIP 78573 |
10.30 |
| 2026-05-15 00:00 |
16:02:58.45 |
-18:04:03.3 |
HIP 78573 |
7.85 |
| 2026-05-15 12:00 |
16:02:42.11 |
-18:03:27.3 |
HIP 78573 |
6.90 |
| 2026-05-16 00:00 |
16:02:25.74 |
-18:02:51.3 |
HIP 78573 |
8.04 |
| 2026-05-16 12:00 |
16:02:09.32 |
-18:02:15.3 |
HIP 78573 |
10.62 |
| 2026-05-17 00:00 |
16:01:52.87 |
-18:01:39.2 |
HIP 78573 |
13.87 |
| 2026-05-17 12:00 |
16:01:36.40 |
-18:01:03.2 |
HIP 78566 |
16.73 |
| 2026-05-18 00:00 |
16:01:19.90 |
-18:00:27.1 |
HIP 78566 |
19.85 |
| 2026-05-18 12:00 |
16:01:03.37 |
-17:59:51.0 |
HIP 78426 |
21.31 |
| 2026-05-19 00:00 |
16:00:46.82 |
-17:59:15.0 |
HIP 78426 |
19.93 |
| 2026-05-19 12:00 |
16:00:30.26 |
-17:58:39.0 |
HIP 78426 |
19.28 |
| 2026-05-20 00:00 |
16:00:13.68 |
-17:58:03.0 |
HIP 78426 |
19.44 |
| 2026-05-20 12:00 |
15:59:57.09 |
-17:57:27.0 |
HIP 78314 |
19.15 |
| 2026-05-21 00:00 |
15:59:40.49 |
-17:56:51.1 |
HIP 78314 |
18.61 |
| 2026-05-21 12:00 |
15:59:23.89 |
-17:56:15.2 |
HIP 78225 |
17.99 |
| 2026-05-22 00:00 |
15:59:07.29 |
-17:55:39.3 |
HIP 78225 |
14.66 |
| 2026-05-22 12:00 |
15:58:50.68 |
-17:55:03.6 |
HIP 78225 |
11.74 |
| 2026-05-23 00:00 |
15:58:34.08 |
-17:54:27.9 |
HIP 78225 |
9.64 |
| 2026-05-23 12:00 |
15:58:17.48 |
-17:53:52.3 |
HIP 78225 |
8.94 |
| 2026-05-24 00:00 |
15:58:00.90 |
-17:53:16.8 |
HIP 78225 |
9.94 |
| 2026-05-24 12:00 |
15:57:44.32 |
-17:52:41.3 |
HIP 78225 |
12.23 |
| 2026-05-25 00:00 |
15:57:27.76 |
-17:52:06.0 |
HIP 78225 |
15.23 |
| 2026-05-25 12:00 |
15:57:11.22 |
-17:51:30.8 |
HIP 78225 |
18.60 |
| 2026-05-26 00:00 |
15:56:54.70 |
-17:50:55.7 |
HIP 78018 |
18.86 |
| 2026-05-26 12:00 |
15:56:38.20 |
-17:50:20.7 |
HIP 78018 |
16.22 |
| 2026-05-27 00:00 |
15:56:21.73 |
-17:49:45.8 |
HIP 78018 |
14.21 |
| 2026-05-27 12:00 |
15:56:05.28 |
-17:49:11.1 |
HIP 78018 |
13.12 |
| 2026-05-28 00:00 |
15:55:48.87 |
-17:48:36.5 |
HIP 78018 |
13.17 |
| 2026-05-28 12:00 |
15:55:32.49 |
-17:48:02.1 |
HIP 78018 |
14.35 |
| 2026-05-29 00:00 |
15:55:16.14 |
-17:47:27.9 |
HIP 78018 |
16.40 |
| 2026-05-29 12:00 |
15:54:59.84 |
-17:46:53.8 |
HIP 78018 |
19.05 |
| 2026-05-30 00:00 |
15:54:43.57 |
-17:46:19.9 |
HIP 78018 |
22.07 |
| 2026-05-30 12:00 |
15:54:27.35 |
-17:45:46.1 |
HIP 77808 |
20.75 |
| 2026-05-31 00:00 |
15:54:11.18 |
-17:45:12.6 |
HIP 77808 |
18.20 |
| 2026-05-31 12:00 |
15:53:55.05 |
-17:44:39.2 |
HIP 77808 |
16.18 |
| 2026-06-01 00:00 |
15:53:38.98 |
-17:44:06.1 |
HIP 77808 |
14.92 |
| 2026-06-01 12:00 |
15:53:22.96 |
-17:43:33.1 |
HIP 77808 |
14.61 |
| 2026-06-02 00:00 |
15:53:07.00 |
-17:43:00.4 |
HIP 77808 |
15.28 |