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) |
| 2026-07-29 00:00 |
01:45:20.88 |
+25:42:00.2 |
HIP 8151 |
9.46 |
| 2026-07-29 12:00 |
01:45:31.39 |
+25:44:16.5 |
HIP 8151 |
10.45 |
| 2026-07-30 00:00 |
01:45:41.70 |
+25:46:32.0 |
HIP 8151 |
12.23 |
| 2026-07-30 12:00 |
01:45:51.82 |
+25:48:46.8 |
HIP 8285 |
13.53 |
| 2026-07-31 00:00 |
01:46:01.73 |
+25:51:00.7 |
HIP 8285 |
10.55 |
| 2026-07-31 12:00 |
01:46:11.45 |
+25:53:13.8 |
HIP 8285 |
7.77 |
| 2026-08-01 00:00 |
01:46:20.96 |
+25:55:26.0 |
HIP 8285 |
5.41 |
| 2026-08-01 12:00 |
01:46:30.27 |
+25:57:37.4 |
HIP 8285 |
4.15 |
| 2026-08-02 00:00 |
01:46:39.38 |
+25:59:48.0 |
HIP 8285 |
4.86 |
| 2026-08-02 12:00 |
01:46:48.28 |
+26:01:57.6 |
HIP 8285 |
6.89 |
| 2026-08-03 00:00 |
01:46:56.97 |
+26:04:06.4 |
HIP 8300 |
6.16 |
| 2026-08-03 12:00 |
01:47:05.46 |
+26:06:14.4 |
HIP 8300 |
3.89 |
| 2026-08-04 00:00 |
01:47:13.73 |
+26:08:21.4 |
HIP 8300 |
2.92 |
| 2026-08-04 12:00 |
01:47:21.79 |
+26:10:27.5 |
HIP 8300 |
4.16 |
| 2026-08-05 00:00 |
01:47:29.64 |
+26:12:32.7 |
HIP 8300 |
6.39 |
| 2026-08-05 12:00 |
01:47:37.27 |
+26:14:36.9 |
HIP 8300 |
8.86 |
| 2026-08-06 00:00 |
01:47:44.69 |
+26:16:40.2 |
HIP 8300 |
11.37 |
| 2026-08-06 12:00 |
01:47:51.89 |
+26:18:42.6 |
HIP 8300 |
13.89 |
| 2026-08-07 00:00 |
01:47:58.87 |
+26:20:44.0 |
HIP 8300 |
16.38 |
| 2026-08-07 12:00 |
01:48:05.62 |
+26:22:44.4 |
HIP 8300 |
18.84 |
| 2026-08-08 00:00 |
01:48:12.16 |
+26:24:43.8 |
HIP 8490 |
17.18 |
| 2026-08-08 12:00 |
01:48:18.47 |
+26:26:42.2 |
HIP 8490 |
15.47 |
| 2026-08-09 00:00 |
01:48:24.56 |
+26:28:39.6 |
HIP 8490 |
14.02 |
| 2026-08-09 12:00 |
01:48:30.42 |
+26:30:35.9 |
HIP 8490 |
12.90 |
| 2026-08-10 00:00 |
01:48:36.05 |
+26:32:31.2 |
HIP 8490 |
12.17 |
| 2026-08-10 12:00 |
01:48:41.45 |
+26:34:25.5 |
HIP 8490 |
11.89 |
| 2026-08-11 00:00 |
01:48:46.62 |
+26:36:18.7 |
HIP 8490 |
12.06 |
| 2026-08-11 12:00 |
01:48:51.56 |
+26:38:10.8 |
HIP 8490 |
12.64 |
| 2026-08-12 00:00 |
01:48:56.27 |
+26:40:01.8 |
HIP 8490 |
13.56 |
| 2026-08-12 12:00 |
01:49:00.74 |
+26:41:51.7 |
HIP 8490 |
14.74 |
| 2026-08-13 00:00 |
01:49:04.98 |
+26:43:40.5 |
HIP 8490 |
16.10 |
| 2026-08-13 12:00 |
01:49:08.97 |
+26:45:28.2 |
HIP 8490 |
17.59 |
| 2026-08-14 00:00 |
01:49:12.73 |
+26:47:14.7 |
HIP 8490 |
19.16 |
| 2026-08-14 12:00 |
01:49:16.26 |
+26:49:00.0 |
HIP 8545 |
17.92 |
| 2026-08-15 00:00 |
01:49:19.54 |
+26:50:44.2 |
HIP 8545 |
16.17 |
| 2026-08-15 12:00 |
01:49:22.58 |
+26:52:27.2 |
HIP 8545 |
14.51 |
| 2026-08-16 00:00 |
01:49:25.38 |
+26:54:09.0 |
HIP 8545 |
12.95 |
| 2026-08-16 12:00 |
01:49:27.93 |
+26:55:49.6 |
HIP 8545 |
11.53 |
| 2026-08-17 00:00 |
01:49:30.25 |
+26:57:29.0 |
HIP 8545 |
10.27 |
| 2026-08-17 12:00 |
01:49:32.31 |
+26:59:07.2 |
HIP 8545 |
9.22 |
| 2026-08-18 00:00 |
01:49:34.14 |
+27:00:44.1 |
HIP 8545 |
8.45 |
| 2026-08-18 12:00 |
01:49:35.71 |
+27:02:19.7 |
HIP 8545 |
8.01 |
| 2026-08-19 00:00 |
01:49:37.04 |
+27:03:54.1 |
HIP 8545 |
7.94 |