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 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
23:46:07.40 |
+02:41:53.7 |
HIP 117319 |
21.40 |
| 2026-09-20 12:00 |
23:46:04.15 |
+02:41:36.8 |
HIP 117319 |
22.23 |
| 2026-09-21 00:00 |
23:46:00.90 |
+02:41:19.9 |
HIP 117319 |
23.07 |
| 2026-09-21 12:00 |
23:45:57.65 |
+02:41:03.0 |
HIP 117319 |
23.91 |
| 2026-09-22 00:00 |
23:45:54.41 |
+02:40:46.0 |
HIP 117319 |
24.75 |
| 2026-09-22 12:00 |
23:45:51.17 |
+02:40:29.1 |
HIP 117319 |
25.59 |
| 2026-09-23 00:00 |
23:45:47.92 |
+02:40:12.1 |
HIP 117319 |
26.44 |
| 2026-09-23 12:00 |
23:45:44.68 |
+02:39:55.1 |
HIP 117319 |
27.28 |
| 2026-09-24 00:00 |
23:45:41.45 |
+02:39:38.1 |
HIP 117319 |
28.12 |
| 2026-09-24 12:00 |
23:45:38.21 |
+02:39:21.0 |
HIP 117319 |
28.97 |
| 2026-09-25 00:00 |
23:45:34.98 |
+02:39:04.0 |
HIP 117319 |
29.81 |
| 2026-09-25 12:00 |
23:45:31.75 |
+02:38:46.9 |
HIP 117319 |
30.66 |
| 2026-09-26 00:00 |
23:45:28.53 |
+02:38:29.8 |
HIP 117319 |
31.50 |
| 2026-09-26 12:00 |
23:45:25.31 |
+02:38:12.7 |
HIP 117319 |
32.34 |
| 2026-09-27 00:00 |
23:45:22.09 |
+02:37:55.6 |
HIP 117156 |
32.75 |
| 2026-09-27 12:00 |
23:45:18.88 |
+02:37:38.5 |
HIP 117156 |
32.36 |
| 2026-09-28 00:00 |
23:45:15.67 |
+02:37:21.4 |
HIP 117156 |
32.00 |
| 2026-09-28 12:00 |
23:45:12.47 |
+02:37:04.3 |
HIP 117156 |
31.65 |
| 2026-09-29 00:00 |
23:45:09.27 |
+02:36:47.2 |
HIP 117156 |
31.33 |
| 2026-09-29 12:00 |
23:45:06.07 |
+02:36:30.0 |
HIP 117156 |
31.02 |
| 2026-09-30 00:00 |
23:45:02.88 |
+02:36:12.9 |
HIP 117084 |
30.52 |
| 2026-09-30 12:00 |
23:44:59.70 |
+02:35:55.8 |
HIP 117084 |
29.92 |
| 2026-10-01 00:00 |
23:44:56.52 |
+02:35:38.7 |
HIP 117084 |
29.34 |
| 2026-10-01 12:00 |
23:44:53.35 |
+02:35:21.6 |
HIP 117084 |
28.76 |
| 2026-10-02 00:00 |
23:44:50.19 |
+02:35:04.5 |
HIP 117084 |
28.21 |
| 2026-10-02 12:00 |
23:44:47.03 |
+02:34:47.4 |
HIP 117084 |
27.66 |
| 2026-10-03 00:00 |
23:44:43.87 |
+02:34:30.3 |
HIP 117084 |
27.14 |
| 2026-10-03 12:00 |
23:44:40.73 |
+02:34:13.2 |
HIP 117084 |
26.63 |
| 2026-10-04 00:00 |
23:44:37.59 |
+02:33:56.2 |
HIP 117084 |
26.13 |
| 2026-10-04 12:00 |
23:44:34.46 |
+02:33:39.1 |
HIP 117084 |
25.66 |
| 2026-10-05 00:00 |
23:44:31.34 |
+02:33:22.1 |
HIP 117084 |
25.20 |
| 2026-10-05 12:00 |
23:44:28.23 |
+02:33:05.1 |
HIP 117084 |
24.77 |
| 2026-10-06 00:00 |
23:44:25.12 |
+02:32:48.1 |
HIP 117084 |
24.35 |
| 2026-10-06 12:00 |
23:44:22.02 |
+02:32:31.2 |
HIP 117084 |
23.96 |
| 2026-10-07 00:00 |
23:44:18.93 |
+02:32:14.2 |
HIP 117084 |
23.59 |
| 2026-10-07 12:00 |
23:44:15.85 |
+02:31:57.3 |
HIP 117084 |
23.25 |
| 2026-10-08 00:00 |
23:44:12.78 |
+02:31:40.4 |
HIP 117084 |
22.93 |
| 2026-10-08 12:00 |
23:44:09.72 |
+02:31:23.5 |
HIP 117084 |
22.63 |
| 2026-10-09 00:00 |
23:44:06.67 |
+02:31:06.7 |
HIP 117084 |
22.36 |
| 2026-10-09 12:00 |
23:44:03.63 |
+02:30:49.9 |
HIP 117084 |
22.12 |
| 2026-10-10 00:00 |
23:44:00.60 |
+02:30:33.2 |
HIP 117084 |
21.90 |
| 2026-10-10 12:00 |
23:43:57.58 |
+02:30:16.4 |
HIP 117084 |
21.72 |
| 2026-10-11 00:00 |
23:43:54.57 |
+02:29:59.7 |
HIP 117084 |
21.56 |