| 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) |
| 2026-05-12 00:00 |
00:50:59.34 |
+18:12:53.7 |
HIP 4141 |
28.89 |
| 2026-05-12 12:00 |
00:51:26.44 |
+18:16:02.7 |
HIP 4141 |
23.75 |
| 2026-05-13 00:00 |
00:51:53.50 |
+18:19:11.6 |
HIP 4141 |
19.92 |
| 2026-05-13 12:00 |
00:52:20.52 |
+18:22:20.6 |
HIP 4190 |
16.75 |
| 2026-05-14 00:00 |
00:52:47.50 |
+18:25:29.5 |
HIP 4190 |
10.46 |
| 2026-05-14 12:00 |
00:53:14.44 |
+18:28:38.5 |
HIP 4190 |
6.35 |
| 2026-05-15 00:00 |
00:53:41.33 |
+18:31:47.4 |
HIP 4190 |
8.53 |
| 2026-05-15 12:00 |
00:54:08.19 |
+18:34:56.3 |
HIP 4190 |
14.35 |
| 2026-05-16 00:00 |
00:54:35.00 |
+18:38:05.2 |
HIP 4190 |
20.97 |
| 2026-05-16 12:00 |
00:55:01.77 |
+18:41:14.1 |
HIP 4190 |
27.82 |
| 2026-05-17 00:00 |
00:55:28.50 |
+18:44:22.9 |
HIP 4267 |
29.73 |
| 2026-05-17 12:00 |
00:55:55.18 |
+18:47:31.7 |
HIP 4487 |
25.29 |
| 2026-05-18 00:00 |
00:56:21.81 |
+18:50:40.5 |
HIP 4487 |
21.58 |
| 2026-05-18 12:00 |
00:56:48.40 |
+18:53:49.2 |
HIP 4487 |
19.78 |
| 2026-05-19 00:00 |
00:57:14.94 |
+18:56:57.9 |
HIP 4487 |
20.40 |
| 2026-05-19 12:00 |
00:57:41.43 |
+19:00:06.5 |
HIP 4487 |
23.23 |
| 2026-05-20 00:00 |
00:58:07.87 |
+19:03:15.0 |
HIP 4487 |
27.59 |
| 2026-05-20 12:00 |
00:58:34.26 |
+19:06:23.5 |
HIP 4487 |
32.87 |
| 2026-05-21 00:00 |
00:59:00.61 |
+19:09:32.0 |
HIP 4705 |
35.06 |
| 2026-05-21 12:00 |
00:59:26.90 |
+19:12:40.3 |
HIP 4705 |
34.52 |
| 2026-05-22 00:00 |
00:59:53.14 |
+19:15:48.6 |
HIP 4705 |
35.38 |
| 2026-05-22 12:00 |
01:00:19.32 |
+19:18:56.8 |
HIP 4705 |
37.53 |
| 2026-05-23 00:00 |
01:00:45.46 |
+19:22:04.9 |
HIP 4565 |
40.53 |
| 2026-05-23 12:00 |
01:01:11.54 |
+19:25:12.9 |
HIP 4565 |
44.08 |
| 2026-05-24 00:00 |
01:01:37.57 |
+19:28:20.9 |
HIP 5037 |
41.11 |
| 2026-05-24 12:00 |
01:02:03.54 |
+19:31:28.7 |
HIP 5037 |
35.69 |
| 2026-05-25 00:00 |
01:02:29.46 |
+19:34:36.5 |
HIP 5037 |
30.88 |
| 2026-05-25 12:00 |
01:02:55.32 |
+19:37:44.1 |
HIP 5037 |
26.98 |
| 2026-05-26 00:00 |
01:03:21.12 |
+19:40:51.7 |
HIP 5037 |
24.44 |
| 2026-05-26 12:00 |
01:03:46.87 |
+19:43:59.1 |
HIP 4927 |
23.22 |
| 2026-05-27 00:00 |
01:04:12.56 |
+19:47:06.4 |
HIP 4927 |
23.30 |
| 2026-05-27 12:00 |
01:04:38.19 |
+19:50:13.7 |
HIP 4927 |
25.26 |
| 2026-05-28 00:00 |
01:05:03.77 |
+19:53:20.8 |
HIP 4927 |
28.72 |
| 2026-05-28 12:00 |
01:05:29.28 |
+19:56:27.8 |
HIP 5248 |
26.22 |
| 2026-05-29 00:00 |
01:05:54.73 |
+19:59:34.6 |
HIP 5248 |
19.48 |
| 2026-05-29 12:00 |
01:06:20.13 |
+20:02:41.4 |
HIP 5248 |
12.76 |
| 2026-05-30 00:00 |
01:06:45.46 |
+20:05:48.0 |
HIP 5248 |
6.06 |
| 2026-05-30 12:00 |
01:07:10.72 |
+20:08:54.5 |
HIP 5248 |
0.84 |
| 2026-05-31 00:00 |
01:07:35.93 |
+20:12:00.8 |
HIP 5248 |
7.36 |
| 2026-05-31 12:00 |
01:08:01.07 |
+20:15:07.0 |
HIP 5248 |
14.02 |
| 2026-06-01 00:00 |
01:08:26.15 |
+20:18:13.1 |
HIP 5285 |
19.40 |
| 2026-06-01 12:00 |
01:08:51.16 |
+20:21:19.0 |
HIP 5285 |
21.46 |
| 2026-06-02 00:00 |
01:09:16.10 |
+20:24:24.8 |
HIP 5285 |
25.14 |