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) |
| 2026-05-12 00:00 |
11:31:34.66 |
+11:24:40.5 |
HIP 56182 |
11.24 |
| 2026-05-12 12:00 |
11:31:33.04 |
+11:23:20.7 |
HIP 56182 |
11.80 |
| 2026-05-13 00:00 |
11:31:31.64 |
+11:21:59.7 |
HIP 56182 |
12.53 |
| 2026-05-13 12:00 |
11:31:30.47 |
+11:20:37.4 |
HIP 56224 |
13.35 |
| 2026-05-14 00:00 |
11:31:29.52 |
+11:19:13.9 |
HIP 56224 |
11.98 |
| 2026-05-14 12:00 |
11:31:28.79 |
+11:17:49.1 |
HIP 56224 |
10.59 |
| 2026-05-15 00:00 |
11:31:28.29 |
+11:16:23.2 |
HIP 56224 |
9.19 |
| 2026-05-15 12:00 |
11:31:28.01 |
+11:14:56.1 |
HIP 56224 |
7.76 |
| 2026-05-16 00:00 |
11:31:27.95 |
+11:13:27.7 |
HIP 56224 |
6.32 |
| 2026-05-16 12:00 |
11:31:28.11 |
+11:11:58.2 |
HIP 56224 |
4.87 |
| 2026-05-17 00:00 |
11:31:28.49 |
+11:10:27.5 |
HIP 56224 |
3.41 |
| 2026-05-17 12:00 |
11:31:29.09 |
+11:08:55.6 |
HIP 56224 |
1.99 |
| 2026-05-18 00:00 |
11:31:29.91 |
+11:07:22.5 |
HIP 56224 |
0.94 |
| 2026-05-18 12:00 |
11:31:30.94 |
+11:05:48.3 |
HIP 56224 |
1.64 |
| 2026-05-19 00:00 |
11:31:32.19 |
+11:04:13.0 |
HIP 56224 |
3.10 |
| 2026-05-19 12:00 |
11:31:33.66 |
+11:02:36.6 |
HIP 56224 |
4.69 |
| 2026-05-20 00:00 |
11:31:35.35 |
+11:00:59.0 |
HIP 56224 |
6.33 |
| 2026-05-20 12:00 |
11:31:37.24 |
+10:59:20.3 |
HIP 56224 |
8.01 |
| 2026-05-21 00:00 |
11:31:39.35 |
+10:57:40.5 |
HIP 56224 |
9.72 |
| 2026-05-21 12:00 |
11:31:41.67 |
+10:55:59.6 |
HIP 56224 |
11.47 |
| 2026-05-22 00:00 |
11:31:44.20 |
+10:54:17.7 |
HIP 56224 |
13.26 |
| 2026-05-22 12:00 |
11:31:46.94 |
+10:52:34.6 |
HIP 56224 |
15.07 |
| 2026-05-23 00:00 |
11:31:49.89 |
+10:50:50.6 |
HIP 56224 |
16.93 |
| 2026-05-23 12:00 |
11:31:53.05 |
+10:49:05.4 |
HIP 56224 |
18.81 |
| 2026-05-24 00:00 |
11:31:56.41 |
+10:47:19.3 |
HIP 56224 |
20.74 |
| 2026-05-24 12:00 |
11:31:59.97 |
+10:45:32.1 |
HIP 56224 |
22.70 |
| 2026-05-25 00:00 |
11:32:03.74 |
+10:43:43.9 |
HIP 56224 |
24.69 |
| 2026-05-25 12:00 |
11:32:07.71 |
+10:41:54.7 |
HIP 56224 |
26.72 |
| 2026-05-26 00:00 |
11:32:11.89 |
+10:40:04.5 |
HIP 56224 |
28.79 |
| 2026-05-26 12:00 |
11:32:16.26 |
+10:38:13.3 |
HIP 56224 |
30.89 |
| 2026-05-27 00:00 |
11:32:20.83 |
+10:36:21.1 |
HIP 56224 |
33.04 |
| 2026-05-27 12:00 |
11:32:25.59 |
+10:34:28.0 |
HIP 56224 |
35.21 |
| 2026-05-28 00:00 |
11:32:30.56 |
+10:32:33.9 |
HIP 56224 |
37.43 |
| 2026-05-28 12:00 |
11:32:35.71 |
+10:30:38.9 |
HIP 56429 |
38.51 |
| 2026-05-29 00:00 |
11:32:41.07 |
+10:28:42.9 |
HIP 56429 |
39.33 |
| 2026-05-29 12:00 |
11:32:46.61 |
+10:26:46.0 |
HIP 56491 |
39.20 |
| 2026-05-30 00:00 |
11:32:52.34 |
+10:24:48.2 |
HIP 56491 |
36.88 |
| 2026-05-30 12:00 |
11:32:58.27 |
+10:22:49.5 |
HIP 56491 |
34.53 |
| 2026-05-31 00:00 |
11:33:04.38 |
+10:20:49.9 |
HIP 56491 |
32.15 |
| 2026-05-31 12:00 |
11:33:10.68 |
+10:18:49.3 |
HIP 56491 |
29.74 |
| 2026-06-01 00:00 |
11:33:17.17 |
+10:16:47.9 |
HIP 56491 |
27.31 |
| 2026-06-01 12:00 |
11:33:23.84 |
+10:14:45.6 |
HIP 56491 |
24.86 |
| 2026-06-02 00:00 |
11:33:30.70 |
+10:12:42.5 |
HIP 56491 |
22.40 |