283P/Spacewatch
| Parameter |
Value |
| Designation |
283P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-04-06T23:45:57.098880Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:14:11Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
16.700 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-03-13.0000000 |
| e |
0.48567912 |
| q (au) |
2.126445 |
| a (au) |
4.134471 |
| i (deg) |
14.464365 |
| Ω (om, deg) |
161.248171 |
| ω (w, deg) |
21.995380 |
| M (ma, deg) |
314.277725 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
00:06:45.02 |
-05:23:07.8 |
HIP 637 |
16.75 |
| 2026-02-03 12:00 |
00:07:00.82 |
-05:21:24.2 |
HIP 637 |
14.03 |
| 2026-02-04 00:00 |
00:07:16.70 |
-05:19:40.4 |
HIP 637 |
12.24 |
| 2026-02-04 12:00 |
00:07:32.65 |
-05:17:56.1 |
HIP 637 |
11.84 |
| 2026-02-05 00:00 |
00:07:48.68 |
-05:16:11.6 |
HIP 637 |
12.97 |
| 2026-02-05 12:00 |
00:08:04.78 |
-05:14:26.6 |
HIP 637 |
15.31 |
| 2026-02-06 00:00 |
00:08:20.96 |
-05:12:41.4 |
HIP 637 |
18.42 |
| 2026-02-06 12:00 |
00:08:37.21 |
-05:10:55.8 |
HIP 637 |
21.99 |
| 2026-02-07 00:00 |
00:08:53.53 |
-05:09:09.9 |
HIP 840 |
22.01 |
| 2026-02-07 12:00 |
00:09:09.92 |
-05:07:23.7 |
HIP 840 |
18.74 |
| 2026-02-08 00:00 |
00:09:26.38 |
-05:05:37.1 |
HIP 840 |
16.03 |
| 2026-02-08 12:00 |
00:09:42.91 |
-05:03:50.3 |
HIP 840 |
14.24 |
| 2026-02-09 00:00 |
00:09:59.52 |
-05:02:03.1 |
HIP 840 |
13.73 |
| 2026-02-09 12:00 |
00:10:16.19 |
-05:00:15.6 |
HIP 840 |
14.67 |
| 2026-02-10 00:00 |
00:10:32.92 |
-04:58:27.9 |
HIP 936 |
16.61 |
| 2026-02-10 12:00 |
00:10:49.73 |
-04:56:39.8 |
HIP 936 |
13.64 |
| 2026-02-11 00:00 |
00:11:06.60 |
-04:54:51.5 |
HIP 936 |
11.73 |
| 2026-02-11 12:00 |
00:11:23.54 |
-04:53:02.9 |
HIP 936 |
11.45 |
| 2026-02-12 00:00 |
00:11:40.54 |
-04:51:14.0 |
HIP 936 |
12.91 |
| 2026-02-12 12:00 |
00:11:57.61 |
-04:49:24.8 |
HIP 936 |
15.66 |
| 2026-02-13 00:00 |
00:12:14.74 |
-04:47:35.4 |
HIP 936 |
19.15 |
| 2026-02-13 12:00 |
00:12:31.93 |
-04:45:45.7 |
HIP 936 |
23.07 |
| 2026-02-14 00:00 |
00:12:49.19 |
-04:43:55.8 |
HIP 936 |
27.23 |
| 2026-02-14 12:00 |
00:13:06.51 |
-04:42:05.6 |
HIP 936 |
31.55 |
| 2026-02-15 00:00 |
00:13:23.89 |
-04:40:15.2 |
HIP 1062 |
34.39 |
| 2026-02-15 12:00 |
00:13:41.33 |
-04:38:24.5 |
HIP 1062 |
36.84 |
| 2026-02-16 00:00 |
00:13:58.83 |
-04:36:33.6 |
HIP 1062 |
39.70 |
| 2026-02-16 12:00 |
00:14:16.38 |
-04:34:42.5 |
HIP 1120 |
40.36 |
| 2026-02-17 00:00 |
00:14:34.00 |
-04:32:51.2 |
HIP 1120 |
39.19 |
| 2026-02-17 12:00 |
00:14:51.67 |
-04:30:59.7 |
HIP 1380 |
36.14 |
| 2026-02-18 00:00 |
00:15:09.40 |
-04:29:07.9 |
HIP 1380 |
31.57 |
| 2026-02-18 12:00 |
00:15:27.19 |
-04:27:16.0 |
HIP 1380 |
27.07 |
| 2026-02-19 00:00 |
00:15:45.03 |
-04:25:23.8 |
HIP 1380 |
22.67 |
| 2026-02-19 12:00 |
00:16:02.92 |
-04:23:31.5 |
HIP 1380 |
18.48 |
| 2026-02-20 00:00 |
00:16:20.87 |
-04:21:39.0 |
HIP 1380 |
14.67 |
| 2026-02-20 12:00 |
00:16:38.87 |
-04:19:46.3 |
HIP 1380 |
11.66 |
| 2026-02-21 00:00 |
00:16:56.93 |
-04:17:53.4 |
HIP 1380 |
10.20 |
| 2026-02-21 12:00 |
00:17:15.03 |
-04:16:00.4 |
HIP 1380 |
10.94 |
| 2026-02-22 00:00 |
00:17:33.18 |
-04:14:07.2 |
HIP 1380 |
13.54 |
| 2026-02-22 12:00 |
00:17:51.39 |
-04:12:13.8 |
HIP 1380 |
17.18 |
| 2026-02-23 00:00 |
00:18:09.64 |
-04:10:20.3 |
HIP 1380 |
21.35 |
| 2026-02-23 12:00 |
00:18:27.94 |
-04:08:26.7 |
HIP 1380 |
25.80 |
| 2026-02-24 00:00 |
00:18:46.29 |
-04:06:32.9 |
HIP 1380 |
30.42 |