| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
01:09:40.98 |
+20:27:30.4 |
HIP 5310 |
29.58 |
| 2026-06-03 00:00 |
01:10:05.79 |
+20:30:35.9 |
HIP 5310 |
33.11 |
| 2026-06-03 12:00 |
01:10:30.54 |
+20:33:41.2 |
HIP 5571 |
31.33 |
| 2026-06-04 00:00 |
01:10:55.21 |
+20:36:46.3 |
HIP 5571 |
26.39 |
| 2026-06-04 12:00 |
01:11:19.82 |
+20:39:51.3 |
HIP 5571 |
22.29 |
| 2026-06-05 00:00 |
01:11:44.35 |
+20:42:56.1 |
HIP 5571 |
19.56 |
| 2026-06-05 12:00 |
01:12:08.82 |
+20:46:00.7 |
HIP 5667 |
18.37 |
| 2026-06-06 00:00 |
01:12:33.21 |
+20:49:05.2 |
HIP 5667 |
19.31 |
| 2026-06-06 12:00 |
01:12:57.53 |
+20:52:09.5 |
HIP 5667 |
22.18 |
| 2026-06-07 00:00 |
01:13:21.77 |
+20:55:13.6 |
HIP 5774 |
22.91 |
| 2026-06-07 12:00 |
01:13:45.94 |
+20:58:17.5 |
HIP 5774 |
24.00 |
| 2026-06-08 00:00 |
01:14:10.03 |
+21:01:21.2 |
HIP 5770 |
26.63 |
| 2026-06-08 12:00 |
01:14:34.05 |
+21:04:24.7 |
HIP 5770 |
24.52 |
| 2026-06-09 00:00 |
01:14:57.99 |
+21:07:28.0 |
HIP 5770 |
23.98 |
| 2026-06-09 12:00 |
01:15:21.85 |
+21:10:31.1 |
HIP 5977 |
21.92 |
| 2026-06-10 00:00 |
01:15:45.63 |
+21:13:34.0 |
HIP 5977 |
18.35 |
| 2026-06-10 12:00 |
01:16:09.33 |
+21:16:36.7 |
HIP 5977 |
16.53 |
| 2026-06-11 00:00 |
01:16:32.95 |
+21:19:39.2 |
HIP 5977 |
17.02 |
| 2026-06-11 12:00 |
01:16:56.49 |
+21:22:41.4 |
HIP 5977 |
19.62 |
| 2026-06-12 00:00 |
01:17:19.94 |
+21:25:43.4 |
HIP 5977 |
23.63 |
| 2026-06-12 12:00 |
01:17:43.31 |
+21:28:45.2 |
HIP 5977 |
28.45 |
| 2026-06-13 00:00 |
01:18:06.59 |
+21:31:46.7 |
HIP 6219 |
27.33 |
| 2026-06-13 12:00 |
01:18:29.79 |
+21:34:48.0 |
HIP 6219 |
25.18 |
| 2026-06-14 00:00 |
01:18:52.90 |
+21:37:49.0 |
HIP 6219 |
24.45 |
| 2026-06-14 12:00 |
01:19:15.92 |
+21:40:49.8 |
HIP 6301 |
22.59 |
| 2026-06-15 00:00 |
01:19:38.85 |
+21:43:50.3 |
HIP 6301 |
17.07 |
| 2026-06-15 12:00 |
01:20:01.69 |
+21:46:50.6 |
HIP 6301 |
12.17 |
| 2026-06-16 00:00 |
01:20:24.43 |
+21:49:50.5 |
HIP 6301 |
8.92 |
| 2026-06-16 12:00 |
01:20:47.09 |
+21:52:50.2 |
HIP 6301 |
9.20 |
| 2026-06-17 00:00 |
01:21:09.65 |
+21:55:49.6 |
HIP 6301 |
12.75 |
| 2026-06-17 12:00 |
01:21:32.11 |
+21:58:48.8 |
HIP 6301 |
17.69 |
| 2026-06-18 00:00 |
01:21:54.48 |
+22:01:47.6 |
HIP 6327 |
22.62 |
| 2026-06-18 12:00 |
01:22:16.75 |
+22:04:46.1 |
HIP 6327 |
22.76 |
| 2026-06-19 00:00 |
01:22:38.92 |
+22:07:44.4 |
HIP 6327 |
24.38 |
| 2026-06-19 12:00 |
01:23:01.00 |
+22:10:42.3 |
HIP 6577 |
22.42 |
| 2026-06-20 00:00 |
01:23:22.97 |
+22:13:39.9 |
HIP 6577 |
19.38 |
| 2026-06-20 12:00 |
01:23:44.85 |
+22:16:37.2 |
HIP 6577 |
17.83 |
| 2026-06-21 00:00 |
01:24:06.62 |
+22:19:34.2 |
HIP 6577 |
18.15 |
| 2026-06-21 12:00 |
01:24:28.29 |
+22:22:30.9 |
HIP 6577 |
20.23 |
| 2026-06-22 00:00 |
01:24:49.86 |
+22:25:27.2 |
HIP 6577 |
23.58 |