メタデータ
| 項目 |
値 |
| Designation |
C/2014 M2 (Christensen) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-07-12T15:05:12.776640Z |
| Orbit solution date (soln_date, UTC) |
2022-06-28T07:55:51Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
11.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-07-19.0000000 |
| e |
0.99274520 |
| q (au) |
6.909654 |
| a (au) |
952.425613 |
| i (deg) |
32.418761 |
| Ω (om, deg) |
245.346855 |
| ω (w, deg) |
40.275887 |
| M (ma, deg) |
0.000214 |
等級
散乱 + 全体線形
$$
M_a = (13.640 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.640 |
| n |
2.000 |
| gf |
0.987 |
| gb |
-0.586 |
| k |
0.800 |
| δ90 |
9.139 |
| 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 |
02:42:24.01 |
+29:00:18.4 |
HIP 12847 |
37.22 |
| 2026-09-20 12:00 |
02:42:21.03 |
+29:00:12.4 |
HIP 12847 |
37.83 |
| 2026-09-21 00:00 |
02:42:18.01 |
+29:00:06.2 |
HIP 12847 |
38.45 |
| 2026-09-21 12:00 |
02:42:14.97 |
+28:59:59.7 |
HIP 12847 |
39.08 |
| 2026-09-22 00:00 |
02:42:11.89 |
+28:59:53.0 |
HIP 12847 |
39.71 |
| 2026-09-22 12:00 |
02:42:08.77 |
+28:59:46.1 |
HIP 12847 |
40.35 |
| 2026-09-23 00:00 |
02:42:05.63 |
+28:59:38.9 |
HIP 12847 |
41.00 |
| 2026-09-23 12:00 |
02:42:02.45 |
+28:59:31.5 |
HIP 12847 |
41.66 |
| 2026-09-24 00:00 |
02:41:59.24 |
+28:59:23.8 |
HIP 12847 |
42.33 |
| 2026-09-24 12:00 |
02:41:56.00 |
+28:59:16.0 |
HIP 12847 |
43.00 |
| 2026-09-25 00:00 |
02:41:52.73 |
+28:59:07.8 |
HIP 12847 |
43.68 |
| 2026-09-25 12:00 |
02:41:49.43 |
+28:58:59.4 |
HIP 12847 |
44.37 |
| 2026-09-26 00:00 |
02:41:46.09 |
+28:58:50.8 |
HIP 12847 |
45.06 |
| 2026-09-26 12:00 |
02:41:42.73 |
+28:58:42.0 |
HIP 12847 |
45.76 |
| 2026-09-27 00:00 |
02:41:39.33 |
+28:58:32.9 |
HIP 12847 |
46.48 |
| 2026-09-27 12:00 |
02:41:35.91 |
+28:58:23.6 |
HIP 12295 |
46.00 |
| 2026-09-28 00:00 |
02:41:32.45 |
+28:58:14.0 |
HIP 12295 |
45.24 |
| 2026-09-28 12:00 |
02:41:28.97 |
+28:58:04.2 |
HIP 12295 |
44.48 |
| 2026-09-29 00:00 |
02:41:25.46 |
+28:57:54.2 |
HIP 12295 |
43.70 |
| 2026-09-29 12:00 |
02:41:21.92 |
+28:57:43.9 |
HIP 12295 |
42.92 |
| 2026-09-30 00:00 |
02:41:18.35 |
+28:57:33.4 |
HIP 12295 |
42.14 |
| 2026-09-30 12:00 |
02:41:14.75 |
+28:57:22.6 |
HIP 12295 |
41.34 |
| 2026-10-01 00:00 |
02:41:11.12 |
+28:57:11.6 |
HIP 12295 |
40.54 |
| 2026-10-01 12:00 |
02:41:07.47 |
+28:57:00.4 |
HIP 12295 |
39.73 |
| 2026-10-02 00:00 |
02:41:03.79 |
+28:56:48.9 |
HIP 12295 |
38.92 |
| 2026-10-02 12:00 |
02:41:00.08 |
+28:56:37.2 |
HIP 12295 |
38.10 |
| 2026-10-03 00:00 |
02:40:56.35 |
+28:56:25.3 |
HIP 12295 |
37.27 |
| 2026-10-03 12:00 |
02:40:52.59 |
+28:56:13.1 |
HIP 12295 |
36.44 |
| 2026-10-04 00:00 |
02:40:48.81 |
+28:56:00.7 |
HIP 12295 |
35.60 |
| 2026-10-04 12:00 |
02:40:44.99 |
+28:55:48.1 |
HIP 12295 |
34.76 |
| 2026-10-05 00:00 |
02:40:41.16 |
+28:55:35.2 |
HIP 12295 |
33.91 |
| 2026-10-05 12:00 |
02:40:37.30 |
+28:55:22.1 |
HIP 12295 |
33.05 |
| 2026-10-06 00:00 |
02:40:33.41 |
+28:55:08.7 |
HIP 12295 |
32.19 |
| 2026-10-06 12:00 |
02:40:29.50 |
+28:54:55.2 |
HIP 12295 |
31.32 |
| 2026-10-07 00:00 |
02:40:25.57 |
+28:54:41.4 |
HIP 12295 |
30.45 |
| 2026-10-07 12:00 |
02:40:21.61 |
+28:54:27.3 |
HIP 12295 |
29.57 |
| 2026-10-08 00:00 |
02:40:17.63 |
+28:54:13.0 |
HIP 12295 |
28.69 |
| 2026-10-08 12:00 |
02:40:13.63 |
+28:53:58.5 |
HIP 12295 |
27.80 |
| 2026-10-09 00:00 |
02:40:09.60 |
+28:53:43.8 |
HIP 12295 |
26.91 |
| 2026-10-09 12:00 |
02:40:05.55 |
+28:53:28.8 |
HIP 12295 |
26.01 |
| 2026-10-10 00:00 |
02:40:01.49 |
+28:53:13.6 |
HIP 12295 |
25.11 |
| 2026-10-10 12:00 |
02:39:57.40 |
+28:52:58.2 |
HIP 12295 |
24.20 |
| 2026-10-11 00:00 |
02:39:53.29 |
+28:52:42.6 |
HIP 12295 |
23.29 |