C/2013 C2 (Tenagra)
メタデータ
| 項目 |
値 |
| Designation |
C/2013 C2 (Tenagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-09-02T00:50:41.694720Z |
| Orbit solution date (soln_date, UTC) |
2025-12-18T15:12:21Z |
| Obs used |
548 |
| NEO |
- |
| M1 |
9.400 |
| 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) |
2016-07-04.0000000 |
| e |
0.43171395 |
| q (au) |
9.131640 |
| a (au) |
16.068738 |
| i (deg) |
21.336799 |
| Ω (om, deg) |
247.531176 |
| ω (w, deg) |
308.902070 |
| M (ma, deg) |
4.681692 |
等級
散乱 + 全体線形
$$
M_a = (1.110 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.110 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.634 |
| k |
0.800 |
| δ90 |
9.992 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
20:11:02.77 |
-02:40:20.4 |
HIP 99289 |
25.97 |
| 2026-02-03 12:00 |
20:11:11.48 |
-02:39:39.3 |
HIP 99289 |
28.02 |
| 2026-02-04 00:00 |
20:11:20.17 |
-02:38:58.0 |
HIP 99604 |
30.10 |
| 2026-02-04 12:00 |
20:11:28.85 |
-02:38:16.4 |
HIP 99604 |
29.08 |
| 2026-02-05 00:00 |
20:11:37.51 |
-02:37:34.6 |
HIP 99604 |
28.21 |
| 2026-02-05 12:00 |
20:11:46.15 |
-02:36:52.6 |
HIP 99604 |
27.51 |
| 2026-02-06 00:00 |
20:11:54.78 |
-02:36:10.3 |
HIP 99604 |
26.99 |
| 2026-02-06 12:00 |
20:12:03.39 |
-02:35:27.8 |
HIP 99604 |
26.66 |
| 2026-02-07 00:00 |
20:12:11.99 |
-02:34:45.1 |
HIP 99604 |
26.52 |
| 2026-02-07 12:00 |
20:12:20.57 |
-02:34:02.1 |
HIP 99604 |
26.58 |
| 2026-02-08 00:00 |
20:12:29.13 |
-02:33:18.9 |
HIP 99604 |
26.83 |
| 2026-02-08 12:00 |
20:12:37.67 |
-02:32:35.5 |
HIP 99604 |
27.27 |
| 2026-02-09 00:00 |
20:12:46.19 |
-02:31:51.9 |
HIP 99604 |
27.89 |
| 2026-02-09 12:00 |
20:12:54.69 |
-02:31:08.0 |
HIP 99604 |
28.68 |
| 2026-02-10 00:00 |
20:13:03.17 |
-02:30:23.9 |
HIP 99604 |
29.62 |
| 2026-02-10 12:00 |
20:13:11.64 |
-02:29:39.6 |
HIP 99604 |
30.70 |
| 2026-02-11 00:00 |
20:13:20.08 |
-02:28:55.1 |
HIP 99604 |
31.91 |
| 2026-02-11 12:00 |
20:13:28.50 |
-02:28:10.4 |
HIP 99835 |
32.44 |
| 2026-02-12 00:00 |
20:13:36.90 |
-02:27:25.4 |
HIP 99835 |
31.00 |
| 2026-02-12 12:00 |
20:13:45.28 |
-02:26:40.3 |
HIP 99835 |
29.67 |
| 2026-02-13 00:00 |
20:13:53.63 |
-02:25:54.9 |
HIP 99835 |
28.46 |
| 2026-02-13 12:00 |
20:14:01.96 |
-02:25:09.4 |
HIP 99869 |
26.71 |
| 2026-02-14 00:00 |
20:14:10.27 |
-02:24:23.6 |
HIP 99869 |
25.04 |
| 2026-02-14 12:00 |
20:14:18.56 |
-02:23:37.6 |
HIP 99869 |
23.46 |
| 2026-02-15 00:00 |
20:14:26.82 |
-02:22:51.5 |
HIP 99869 |
22.00 |
| 2026-02-15 12:00 |
20:14:35.05 |
-02:22:05.1 |
HIP 99869 |
20.67 |
| 2026-02-16 00:00 |
20:14:43.26 |
-02:21:18.5 |
HIP 99869 |
19.51 |
| 2026-02-16 12:00 |
20:14:51.45 |
-02:20:31.8 |
HIP 99869 |
18.55 |
| 2026-02-17 00:00 |
20:14:59.61 |
-02:19:44.8 |
HIP 99869 |
17.81 |
| 2026-02-17 12:00 |
20:15:07.74 |
-02:18:57.7 |
HIP 99869 |
17.32 |
| 2026-02-18 00:00 |
20:15:15.85 |
-02:18:10.4 |
HIP 99869 |
17.10 |
| 2026-02-18 12:00 |
20:15:23.93 |
-02:17:22.9 |
HIP 99869 |
17.16 |
| 2026-02-19 00:00 |
20:15:31.98 |
-02:16:35.2 |
HIP 99869 |
17.50 |
| 2026-02-19 12:00 |
20:15:40.00 |
-02:15:47.4 |
HIP 99916 |
15.66 |
| 2026-02-20 00:00 |
20:15:48.00 |
-02:14:59.3 |
HIP 99916 |
13.76 |
| 2026-02-20 12:00 |
20:15:55.96 |
-02:14:11.1 |
HIP 99916 |
11.95 |
| 2026-02-21 00:00 |
20:16:03.90 |
-02:13:22.8 |
HIP 99916 |
10.28 |
| 2026-02-21 12:00 |
20:16:11.81 |
-02:12:34.2 |
HIP 99916 |
8.80 |
| 2026-02-22 00:00 |
20:16:19.68 |
-02:11:45.5 |
HIP 99916 |
7.65 |
| 2026-02-22 12:00 |
20:16:27.53 |
-02:10:56.7 |
HIP 99916 |
6.96 |
| 2026-02-23 00:00 |
20:16:35.34 |
-02:10:07.6 |
HIP 99916 |
6.88 |
| 2026-02-23 12:00 |
20:16:43.12 |
-02:09:18.5 |
HIP 99916 |
7.42 |
| 2026-02-24 00:00 |
20:16:50.87 |
-02:08:29.1 |
HIP 99916 |
8.46 |