P/2010 UH55 (Spacewatch)
| Parameter |
Value |
| Designation |
P/2010 UH55 (Spacewatch) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-05-10T08:39:59.212800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:46Z |
| Obs used |
164 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
18.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-04-26.0000000 |
| e |
0.57513428 |
| q (au) |
2.767968 |
| a (au) |
6.514923 |
| i (deg) |
8.662558 |
| Ω (om, deg) |
235.264395 |
| ω (w, deg) |
221.618059 |
| M (ma, deg) |
359.148807 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.633 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.633 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.563 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
22:28:45.19 |
-02:24:34.5 |
HIP 110955 |
0.92 |
| 2026-02-03 12:00 |
22:29:05.58 |
-02:22:51.3 |
HIP 110955 |
5.03 |
| 2026-02-04 00:00 |
22:29:26.01 |
-02:21:07.6 |
HIP 110955 |
10.39 |
| 2026-02-04 12:00 |
22:29:46.48 |
-02:19:23.3 |
HIP 110955 |
15.77 |
| 2026-02-05 00:00 |
22:30:06.99 |
-02:17:38.5 |
HIP 110955 |
21.18 |
| 2026-02-05 12:00 |
22:30:27.54 |
-02:15:53.2 |
HIP 110955 |
26.61 |
| 2026-02-06 00:00 |
22:30:48.13 |
-02:14:07.4 |
HIP 110955 |
32.04 |
| 2026-02-06 12:00 |
22:31:08.76 |
-02:12:21.0 |
HIP 110955 |
37.49 |
| 2026-02-07 00:00 |
22:31:29.43 |
-02:10:34.2 |
HIP 110955 |
42.95 |
| 2026-02-07 12:00 |
22:31:50.13 |
-02:08:46.8 |
HIP 111171 |
46.57 |
| 2026-02-08 00:00 |
22:32:10.87 |
-02:06:58.9 |
HIP 111394 |
42.91 |
| 2026-02-08 12:00 |
22:32:31.65 |
-02:05:10.5 |
HIP 111394 |
38.26 |
| 2026-02-09 00:00 |
22:32:52.47 |
-02:03:21.6 |
HIP 111394 |
33.84 |
| 2026-02-09 12:00 |
22:33:13.32 |
-02:01:32.2 |
HIP 111394 |
29.78 |
| 2026-02-10 00:00 |
22:33:34.20 |
-01:59:42.3 |
HIP 111394 |
26.25 |
| 2026-02-10 12:00 |
22:33:55.12 |
-01:57:51.9 |
HIP 111394 |
23.49 |
| 2026-02-11 00:00 |
22:34:16.07 |
-01:56:01.0 |
HIP 111394 |
21.82 |
| 2026-02-11 12:00 |
22:34:37.06 |
-01:54:09.6 |
HIP 111394 |
21.48 |
| 2026-02-12 00:00 |
22:34:58.08 |
-01:52:17.8 |
HIP 111474 |
20.91 |
| 2026-02-12 12:00 |
22:35:19.13 |
-01:50:25.5 |
HIP 111474 |
19.22 |
| 2026-02-13 00:00 |
22:35:40.20 |
-01:48:32.7 |
HIP 111474 |
19.07 |
| 2026-02-13 12:00 |
22:36:01.31 |
-01:46:39.4 |
HIP 111474 |
20.50 |
| 2026-02-14 00:00 |
22:36:22.45 |
-01:44:45.7 |
HIP 111474 |
23.24 |
| 2026-02-14 12:00 |
22:36:43.62 |
-01:42:51.5 |
HIP 111474 |
26.88 |
| 2026-02-15 00:00 |
22:37:04.82 |
-01:40:56.8 |
HIP 111474 |
31.13 |
| 2026-02-15 12:00 |
22:37:26.04 |
-01:39:01.7 |
HIP 111474 |
35.77 |
| 2026-02-16 00:00 |
22:37:47.29 |
-01:37:06.2 |
HIP 111474 |
40.66 |
| 2026-02-16 12:00 |
22:38:08.57 |
-01:35:10.2 |
HIP 111474 |
45.74 |
| 2026-02-17 00:00 |
22:38:29.87 |
-01:33:13.8 |
HIP 112030 |
45.19 |
| 2026-02-17 12:00 |
22:38:51.19 |
-01:31:16.9 |
HIP 112030 |
39.63 |
| 2026-02-18 00:00 |
22:39:12.54 |
-01:29:19.6 |
HIP 112030 |
34.10 |
| 2026-02-18 12:00 |
22:39:33.92 |
-01:27:21.8 |
HIP 112030 |
28.64 |
| 2026-02-19 00:00 |
22:39:55.31 |
-01:25:23.7 |
HIP 112030 |
23.27 |
| 2026-02-19 12:00 |
22:40:16.73 |
-01:23:25.1 |
HIP 112030 |
18.10 |
| 2026-02-20 00:00 |
22:40:38.17 |
-01:21:26.1 |
HIP 112030 |
13.37 |
| 2026-02-20 12:00 |
22:40:59.63 |
-01:19:26.7 |
HIP 112030 |
9.77 |
| 2026-02-21 00:00 |
22:41:21.11 |
-01:17:26.9 |
HIP 112030 |
8.80 |
| 2026-02-21 12:00 |
22:41:42.61 |
-01:15:26.7 |
HIP 112030 |
11.19 |
| 2026-02-22 00:00 |
22:42:04.12 |
-01:13:26.1 |
HIP 112030 |
15.47 |
| 2026-02-22 12:00 |
22:42:25.66 |
-01:11:25.2 |
HIP 112030 |
20.48 |
| 2026-02-23 00:00 |
22:42:47.21 |
-01:09:23.8 |
HIP 112104 |
22.66 |
| 2026-02-23 12:00 |
22:43:08.78 |
-01:07:22.0 |
HIP 112255 |
18.77 |
| 2026-02-24 00:00 |
22:43:30.36 |
-01:05:19.9 |
HIP 112255 |
13.19 |