484P/Spacewatch
| Parameter |
Value |
| Designation |
484P/Spacewatch |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-26T18:15:30.545280Z |
| Orbit solution date (soln_date, UTC) |
2024-06-04T03:10:38Z |
| Obs used |
110 |
| NEO |
- |
| M1 |
15.200 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2005-12-05T11:14:51.360000Z |
| Discovery magnitude (MPC) |
20.50 V |
| Discovery observatory (MPC) |
691 · Steward Observatory, Kitt Peak-Spacewatch |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-02-09.0000000 |
| e |
0.43287084 |
| q (au) |
2.133422 |
| a (au) |
3.761791 |
| i (deg) |
14.469405 |
| Ω (om, deg) |
265.412826 |
| ω (w, deg) |
241.019247 |
| M (ma, deg) |
221.973893 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.232 + 4.022\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.232 |
| n |
4.022 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:21:35.60 |
+09:28:20.9 |
HIP 115293 |
13.89 |
| 2026-02-03 12:00 |
23:21:59.73 |
+09:30:02.6 |
HIP 115293 |
17.41 |
| 2026-02-04 00:00 |
23:22:23.94 |
+09:31:45.3 |
HIP 115293 |
22.15 |
| 2026-02-04 12:00 |
23:22:48.22 |
+09:33:28.9 |
HIP 115293 |
27.49 |
| 2026-02-05 00:00 |
23:23:12.57 |
+09:35:13.5 |
HIP 115293 |
33.15 |
| 2026-02-05 12:00 |
23:23:37.00 |
+09:36:58.9 |
HIP 115293 |
39.02 |
| 2026-02-06 00:00 |
23:24:01.49 |
+09:38:45.3 |
HIP 115719 |
39.47 |
| 2026-02-06 12:00 |
23:24:26.05 |
+09:40:32.6 |
HIP 115719 |
33.22 |
| 2026-02-07 00:00 |
23:24:50.69 |
+09:42:20.8 |
HIP 115719 |
26.98 |
| 2026-02-07 12:00 |
23:25:15.39 |
+09:44:09.9 |
HIP 115719 |
20.78 |
| 2026-02-08 00:00 |
23:25:40.16 |
+09:46:00.0 |
HIP 115719 |
14.69 |
| 2026-02-08 12:00 |
23:26:04.99 |
+09:47:50.9 |
HIP 115719 |
9.00 |
| 2026-02-09 00:00 |
23:26:29.90 |
+09:49:42.7 |
HIP 115719 |
5.30 |
| 2026-02-09 12:00 |
23:26:54.87 |
+09:51:35.4 |
HIP 115719 |
7.59 |
| 2026-02-10 00:00 |
23:27:19.90 |
+09:53:29.0 |
HIP 115719 |
13.06 |
| 2026-02-10 12:00 |
23:27:45.00 |
+09:55:23.5 |
HIP 115719 |
19.17 |
| 2026-02-11 00:00 |
23:28:10.16 |
+09:57:18.8 |
HIP 115719 |
25.47 |
| 2026-02-11 12:00 |
23:28:35.39 |
+09:59:15.0 |
HIP 115719 |
31.88 |
| 2026-02-12 00:00 |
23:29:00.67 |
+10:01:12.1 |
HIP 116037 |
32.28 |
| 2026-02-12 12:00 |
23:29:26.02 |
+10:03:10.0 |
HIP 116037 |
26.32 |
| 2026-02-13 00:00 |
23:29:51.44 |
+10:05:08.7 |
HIP 116037 |
20.71 |
| 2026-02-13 12:00 |
23:30:16.91 |
+10:07:08.4 |
HIP 116037 |
15.82 |
| 2026-02-14 00:00 |
23:30:42.44 |
+10:09:08.8 |
HIP 116037 |
12.56 |
| 2026-02-14 12:00 |
23:31:08.03 |
+10:11:10.1 |
HIP 116037 |
12.34 |
| 2026-02-15 00:00 |
23:31:33.68 |
+10:13:12.3 |
HIP 116037 |
15.30 |
| 2026-02-15 12:00 |
23:31:59.38 |
+10:15:15.2 |
HIP 116037 |
20.11 |
| 2026-02-16 00:00 |
23:32:25.15 |
+10:17:19.0 |
HIP 116037 |
25.76 |
| 2026-02-16 12:00 |
23:32:50.97 |
+10:19:23.6 |
HIP 116037 |
31.81 |
| 2026-02-17 00:00 |
23:33:16.84 |
+10:21:29.0 |
HIP 116037 |
38.09 |
| 2026-02-17 12:00 |
23:33:42.77 |
+10:23:35.1 |
HIP 116466 |
38.63 |
| 2026-02-18 00:00 |
23:34:08.75 |
+10:25:42.1 |
HIP 116466 |
34.70 |
| 2026-02-18 12:00 |
23:34:34.79 |
+10:27:49.9 |
HIP 116403 |
31.36 |
| 2026-02-19 00:00 |
23:35:00.88 |
+10:29:58.5 |
HIP 116403 |
27.79 |
| 2026-02-19 12:00 |
23:35:27.02 |
+10:32:07.8 |
HIP 116403 |
25.53 |
| 2026-02-20 00:00 |
23:35:53.21 |
+10:34:17.9 |
HIP 116403 |
24.95 |
| 2026-02-20 12:00 |
23:36:19.45 |
+10:36:28.8 |
HIP 116403 |
26.18 |
| 2026-02-21 00:00 |
23:36:45.74 |
+10:38:40.4 |
HIP 116529 |
22.44 |
| 2026-02-21 12:00 |
23:37:12.08 |
+10:40:52.8 |
HIP 116529 |
20.30 |
| 2026-02-22 00:00 |
23:37:38.47 |
+10:43:05.9 |
HIP 116529 |
20.35 |
| 2026-02-22 12:00 |
23:38:04.90 |
+10:45:19.8 |
HIP 116529 |
22.57 |
| 2026-02-23 00:00 |
23:38:31.38 |
+10:47:34.4 |
HIP 116529 |
26.45 |
| 2026-02-23 12:00 |
23:38:57.91 |
+10:49:49.7 |
HIP 116529 |
31.37 |
| 2026-02-24 00:00 |
23:39:24.48 |
+10:52:05.8 |
HIP 116817 |
32.60 |