C/2007 M2 (Catalina)
メタデータ
| 項目 |
値 |
| Designation |
C/2007 M2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-12-08T13:33:39.214080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:09Z |
| Obs used |
432 |
| NEO |
- |
| M1 |
11.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-05-25.0000000 |
| e |
0.99933270 |
| q (au) |
3.541046 |
| a (au) |
5306.561037 |
| i (deg) |
80.945662 |
| Ω (om, deg) |
357.282850 |
| ω (w, deg) |
220.668951 |
| M (ma, deg) |
359.999496 |
等級
散乱 + 全体線形
$$
M_a = (14.582 + 2.142\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.582 |
| n |
2.142 |
| gf |
0.998 |
| gb |
-0.776 |
| k |
0.800 |
| 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) |
| 2026-02-03 00:00 |
23:42:38.93 |
+01:35:15.1 |
HIP 116928 |
14.67 |
| 2026-02-03 12:00 |
23:42:41.24 |
+01:35:32.2 |
HIP 116928 |
14.81 |
| 2026-02-04 00:00 |
23:42:43.56 |
+01:35:49.5 |
HIP 116928 |
14.98 |
| 2026-02-04 12:00 |
23:42:45.91 |
+01:36:06.9 |
HIP 116928 |
15.18 |
| 2026-02-05 00:00 |
23:42:48.26 |
+01:36:24.4 |
HIP 116928 |
15.40 |
| 2026-02-05 12:00 |
23:42:50.64 |
+01:36:42.1 |
HIP 116928 |
15.65 |
| 2026-02-06 00:00 |
23:42:53.03 |
+01:36:59.8 |
HIP 116928 |
15.93 |
| 2026-02-06 12:00 |
23:42:55.44 |
+01:37:17.7 |
HIP 116928 |
16.23 |
| 2026-02-07 00:00 |
23:42:57.86 |
+01:37:35.7 |
HIP 116928 |
16.55 |
| 2026-02-07 12:00 |
23:43:00.30 |
+01:37:53.9 |
HIP 116928 |
16.90 |
| 2026-02-08 00:00 |
23:43:02.76 |
+01:38:12.1 |
HIP 116928 |
17.27 |
| 2026-02-08 12:00 |
23:43:05.23 |
+01:38:30.5 |
HIP 116928 |
17.66 |
| 2026-02-09 00:00 |
23:43:07.72 |
+01:38:49.0 |
HIP 116928 |
18.07 |
| 2026-02-09 12:00 |
23:43:10.22 |
+01:39:07.6 |
HIP 116928 |
18.50 |
| 2026-02-10 00:00 |
23:43:12.73 |
+01:39:26.4 |
HIP 116928 |
18.95 |
| 2026-02-10 12:00 |
23:43:15.26 |
+01:39:45.2 |
HIP 116928 |
19.42 |
| 2026-02-11 00:00 |
23:43:17.81 |
+01:40:04.2 |
HIP 116928 |
19.90 |
| 2026-02-11 12:00 |
23:43:20.37 |
+01:40:23.3 |
HIP 116928 |
20.40 |
| 2026-02-12 00:00 |
23:43:22.94 |
+01:40:42.5 |
HIP 116928 |
20.92 |
| 2026-02-12 12:00 |
23:43:25.53 |
+01:41:01.8 |
HIP 116928 |
21.45 |
| 2026-02-13 00:00 |
23:43:28.13 |
+01:41:21.2 |
HIP 116928 |
21.99 |
| 2026-02-13 12:00 |
23:43:30.74 |
+01:41:40.7 |
HIP 116928 |
22.55 |
| 2026-02-14 00:00 |
23:43:33.37 |
+01:42:00.4 |
HIP 116928 |
23.12 |
| 2026-02-14 12:00 |
23:43:36.01 |
+01:42:20.1 |
HIP 116928 |
23.70 |
| 2026-02-15 00:00 |
23:43:38.67 |
+01:42:40.0 |
HIP 116928 |
24.29 |
| 2026-02-15 12:00 |
23:43:41.33 |
+01:43:00.0 |
HIP 116928 |
24.90 |
| 2026-02-16 00:00 |
23:43:44.01 |
+01:43:20.0 |
HIP 116928 |
25.51 |
| 2026-02-16 12:00 |
23:43:46.70 |
+01:43:40.1 |
HIP 117084 |
25.73 |
| 2026-02-17 00:00 |
23:43:49.41 |
+01:44:00.4 |
HIP 117084 |
25.26 |
| 2026-02-17 12:00 |
23:43:52.12 |
+01:44:20.7 |
HIP 117084 |
24.80 |
| 2026-02-18 00:00 |
23:43:54.85 |
+01:44:41.2 |
HIP 117084 |
24.35 |
| 2026-02-18 12:00 |
23:43:57.58 |
+01:45:01.8 |
HIP 117084 |
23.92 |
| 2026-02-19 00:00 |
23:44:00.33 |
+01:45:22.4 |
HIP 117084 |
23.50 |
| 2026-02-19 12:00 |
23:44:03.09 |
+01:45:43.1 |
HIP 117084 |
23.10 |
| 2026-02-20 00:00 |
23:44:05.86 |
+01:46:04.0 |
HIP 117084 |
22.71 |
| 2026-02-20 12:00 |
23:44:08.65 |
+01:46:24.9 |
HIP 117084 |
22.35 |
| 2026-02-21 00:00 |
23:44:11.44 |
+01:46:45.9 |
HIP 117084 |
22.00 |
| 2026-02-21 12:00 |
23:44:14.24 |
+01:47:07.0 |
HIP 117084 |
21.68 |
| 2026-02-22 00:00 |
23:44:17.05 |
+01:47:28.2 |
HIP 117084 |
21.38 |
| 2026-02-22 12:00 |
23:44:19.87 |
+01:47:49.5 |
HIP 117156 |
20.86 |
| 2026-02-23 00:00 |
23:44:22.70 |
+01:48:10.8 |
HIP 117156 |
20.18 |
| 2026-02-23 12:00 |
23:44:25.54 |
+01:48:32.3 |
HIP 117156 |
19.52 |
| 2026-02-24 00:00 |
23:44:28.39 |
+01:48:53.8 |
HIP 117156 |
18.86 |