メタデータ
| 項目 |
値 |
| 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 |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (14.232 + 4.022\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.232 |
| n |
4.022 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
01:39:26.23 |
+27:44:25.8 |
HIP 7708 |
2.81 |
| 2026-09-25 12:00 |
01:39:08.91 |
+27:43:43.4 |
HIP 7708 |
2.05 |
| 2026-09-26 00:00 |
01:38:51.39 |
+27:42:58.7 |
HIP 7708 |
5.61 |
| 2026-09-26 12:00 |
01:38:33.68 |
+27:42:11.7 |
HIP 7708 |
9.54 |
| 2026-09-27 00:00 |
01:38:15.77 |
+27:41:22.4 |
HIP 7708 |
13.56 |
| 2026-09-27 12:00 |
01:37:57.67 |
+27:40:30.8 |
HIP 7708 |
17.64 |
| 2026-09-28 00:00 |
01:37:39.39 |
+27:39:36.9 |
HIP 7708 |
21.78 |
| 2026-09-28 12:00 |
01:37:20.92 |
+27:38:40.6 |
HIP 7708 |
25.98 |
| 2026-09-29 00:00 |
01:37:02.27 |
+27:37:42.0 |
HIP 7482 |
25.37 |
| 2026-09-29 12:00 |
01:36:43.44 |
+27:36:41.1 |
HIP 7482 |
23.21 |
| 2026-09-30 00:00 |
01:36:24.43 |
+27:35:37.8 |
HIP 7482 |
21.64 |
| 2026-09-30 12:00 |
01:36:05.25 |
+27:34:32.2 |
HIP 7482 |
20.85 |
| 2026-10-01 00:00 |
01:35:45.91 |
+27:33:24.3 |
HIP 7482 |
20.95 |
| 2026-10-01 12:00 |
01:35:26.40 |
+27:32:14.0 |
HIP 7482 |
21.95 |
| 2026-10-02 00:00 |
01:35:06.73 |
+27:31:01.3 |
HIP 7287 |
23.44 |
| 2026-10-02 12:00 |
01:34:46.89 |
+27:29:46.3 |
HIP 7287 |
19.62 |
| 2026-10-03 00:00 |
01:34:26.91 |
+27:28:29.0 |
HIP 7287 |
16.13 |
| 2026-10-03 12:00 |
01:34:06.77 |
+27:27:09.2 |
HIP 7287 |
13.32 |
| 2026-10-04 00:00 |
01:33:46.49 |
+27:25:47.2 |
HIP 7287 |
11.71 |
| 2026-10-04 12:00 |
01:33:26.06 |
+27:24:22.8 |
HIP 7287 |
11.86 |
| 2026-10-05 00:00 |
01:33:05.50 |
+27:22:56.0 |
HIP 7287 |
13.77 |
| 2026-10-05 12:00 |
01:32:44.79 |
+27:21:26.9 |
HIP 7287 |
16.87 |
| 2026-10-06 00:00 |
01:32:23.96 |
+27:19:55.4 |
HIP 7287 |
20.67 |
| 2026-10-06 12:00 |
01:32:03.00 |
+27:18:21.6 |
HIP 7287 |
24.87 |
| 2026-10-07 00:00 |
01:31:41.92 |
+27:16:45.4 |
HIP 7287 |
29.31 |
| 2026-10-07 12:00 |
01:31:20.72 |
+27:15:07.0 |
HIP 6997 |
31.98 |
| 2026-10-08 00:00 |
01:30:59.41 |
+27:13:26.2 |
HIP 6997 |
31.31 |
| 2026-10-08 12:00 |
01:30:37.98 |
+27:11:43.1 |
HIP 6997 |
31.46 |
| 2026-10-09 00:00 |
01:30:16.46 |
+27:09:57.7 |
HIP 6997 |
32.45 |
| 2026-10-09 12:00 |
01:29:54.83 |
+27:08:09.9 |
HIP 6997 |
34.21 |
| 2026-10-10 00:00 |
01:29:33.11 |
+27:06:20.0 |
HIP 6997 |
36.66 |
| 2026-10-10 12:00 |
01:29:11.30 |
+27:04:27.7 |
HIP 6736 |
34.40 |
| 2026-10-11 00:00 |
01:28:49.41 |
+27:02:33.2 |
HIP 6736 |
30.51 |
| 2026-10-11 12:00 |
01:28:27.43 |
+27:00:36.4 |
HIP 6736 |
27.08 |
| 2026-10-12 00:00 |
01:28:05.38 |
+26:58:37.4 |
HIP 6736 |
24.32 |
| 2026-10-12 12:00 |
01:27:43.26 |
+26:56:36.2 |
HIP 6736 |
22.50 |
| 2026-10-13 00:00 |
01:27:21.07 |
+26:54:32.8 |
HIP 6736 |
21.89 |
| 2026-10-13 12:00 |
01:26:58.83 |
+26:52:27.2 |
HIP 6678 |
17.56 |
| 2026-10-14 00:00 |
01:26:36.52 |
+26:50:19.4 |
HIP 6678 |
12.81 |
| 2026-10-14 12:00 |
01:26:14.17 |
+26:48:09.4 |
HIP 6678 |
8.86 |
| 2026-10-15 00:00 |
01:25:51.78 |
+26:45:57.4 |
HIP 6678 |
7.23 |
| 2026-10-15 12:00 |
01:25:29.34 |
+26:43:43.2 |
HIP 6678 |
9.29 |
| 2026-10-16 00:00 |
01:25:06.87 |
+26:41:26.9 |
HIP 6678 |
13.47 |