メタデータ
| 項目 |
値 |
| Designation |
497P/Spacewatch-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-12-07T03:44:27.081600Z |
| Orbit solution date (soln_date, UTC) |
2025-04-17T11:12:20Z |
| Obs used |
174 |
| NEO |
- |
| M1 |
8.800 |
| K1 |
32.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2024-10-05T07:22:55.862400Z |
| Discovery magnitude (MPC) |
21.76 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-05-28.0000000 |
| e |
0.63206766 |
| q (au) |
2.055492 |
| a (au) |
5.586604 |
| i (deg) |
10.531278 |
| Ω (om, deg) |
40.651360 |
| ω (w, deg) |
32.434528 |
| M (ma, deg) |
67.389928 |
等級
散乱 + 全体線形
$$
M_a = (14.595 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.595 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.970 |
| δ90 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
11:50:27.82 |
+11:39:10.6 |
HIP 57821 |
16.68 |
| 2026-03-26 12:00 |
11:50:07.41 |
+11:40:15.3 |
HIP 57637 |
19.13 |
| 2026-03-27 00:00 |
11:49:47.09 |
+11:41:18.4 |
HIP 57637 |
14.84 |
| 2026-03-27 12:00 |
11:49:26.88 |
+11:42:20.1 |
HIP 57637 |
11.28 |
| 2026-03-28 00:00 |
11:49:06.78 |
+11:43:20.2 |
HIP 57637 |
9.26 |
| 2026-03-28 12:00 |
11:48:46.80 |
+11:44:18.8 |
HIP 57637 |
9.73 |
| 2026-03-29 00:00 |
11:48:26.93 |
+11:45:15.9 |
HIP 57543 |
12.33 |
| 2026-03-29 12:00 |
11:48:07.19 |
+11:46:11.5 |
HIP 57543 |
8.07 |
| 2026-03-30 00:00 |
11:47:47.57 |
+11:47:05.4 |
HIP 57543 |
5.17 |
| 2026-03-30 12:00 |
11:47:28.08 |
+11:47:57.9 |
HIP 57543 |
5.96 |
| 2026-03-31 00:00 |
11:47:08.72 |
+11:48:48.7 |
HIP 57543 |
9.52 |
| 2026-03-31 12:00 |
11:46:49.49 |
+11:49:38.0 |
HIP 57543 |
13.82 |
| 2026-04-01 00:00 |
11:46:30.41 |
+11:50:25.7 |
HIP 57543 |
18.31 |
| 2026-04-01 12:00 |
11:46:11.46 |
+11:51:11.8 |
HIP 57543 |
22.86 |
| 2026-04-02 00:00 |
11:45:52.66 |
+11:51:56.3 |
HIP 57543 |
27.42 |
| 2026-04-02 12:00 |
11:45:34.00 |
+11:52:39.2 |
HIP 57386 |
30.85 |
| 2026-04-03 00:00 |
11:45:15.49 |
+11:53:20.5 |
HIP 57292 |
30.79 |
| 2026-04-03 12:00 |
11:44:57.14 |
+11:54:00.2 |
HIP 57292 |
30.89 |
| 2026-04-04 00:00 |
11:44:38.94 |
+11:54:38.3 |
HIP 57122 |
29.06 |
| 2026-04-04 12:00 |
11:44:20.90 |
+11:55:14.7 |
HIP 57122 |
24.74 |
| 2026-04-05 00:00 |
11:44:03.02 |
+11:55:49.5 |
HIP 57122 |
20.52 |
| 2026-04-05 12:00 |
11:43:45.31 |
+11:56:22.7 |
HIP 57122 |
16.44 |
| 2026-04-06 00:00 |
11:43:27.76 |
+11:56:54.3 |
HIP 57122 |
12.57 |
| 2026-04-06 12:00 |
11:43:10.38 |
+11:57:24.2 |
HIP 57122 |
9.14 |
| 2026-04-07 00:00 |
11:42:53.18 |
+11:57:52.5 |
HIP 57122 |
6.76 |
| 2026-04-07 12:00 |
11:42:36.14 |
+11:58:19.1 |
HIP 57122 |
6.58 |
| 2026-04-08 00:00 |
11:42:19.29 |
+11:58:44.1 |
HIP 57122 |
8.66 |
| 2026-04-08 12:00 |
11:42:02.61 |
+11:59:07.4 |
HIP 57122 |
11.83 |
| 2026-04-09 00:00 |
11:41:46.12 |
+11:59:29.1 |
HIP 57122 |
15.39 |
| 2026-04-09 12:00 |
11:41:29.81 |
+11:59:49.1 |
HIP 57122 |
19.09 |
| 2026-04-10 00:00 |
11:41:13.69 |
+12:00:07.5 |
HIP 57080 |
20.97 |
| 2026-04-10 12:00 |
11:40:57.75 |
+12:00:24.2 |
HIP 57080 |
23.26 |
| 2026-04-11 00:00 |
11:40:42.01 |
+12:00:39.3 |
HIP 57080 |
25.92 |
| 2026-04-11 12:00 |
11:40:26.46 |
+12:00:52.6 |
HIP 57080 |
28.83 |
| 2026-04-12 00:00 |
11:40:11.11 |
+12:01:04.4 |
HIP 57080 |
31.91 |
| 2026-04-12 12:00 |
11:39:55.95 |
+12:01:14.4 |
HIP 57080 |
35.08 |
| 2026-04-13 00:00 |
11:39:40.99 |
+12:01:22.8 |
HIP 57080 |
38.32 |
| 2026-04-13 12:00 |
11:39:26.24 |
+12:01:29.6 |
HIP 57080 |
41.59 |
| 2026-04-14 00:00 |
11:39:11.69 |
+12:01:34.7 |
HIP 56624 |
38.50 |
| 2026-04-14 12:00 |
11:38:57.34 |
+12:01:38.1 |
HIP 56624 |
35.09 |
| 2026-04-15 00:00 |
11:38:43.20 |
+12:01:39.8 |
HIP 56624 |
31.75 |
| 2026-04-15 12:00 |
11:38:29.27 |
+12:01:39.9 |
HIP 56624 |
28.50 |
| 2026-04-16 00:00 |
11:38:15.56 |
+12:01:38.4 |
HIP 56624 |
25.35 |