C/2017 A3 (Elenin)
メタデータ
| 項目 |
値 |
| Designation |
C/2017 A3 (Elenin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-30T14:31:52.288320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:28Z |
| Obs used |
186 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-10.0000000 |
| e |
0.91107616 |
| q (au) |
3.854543 |
| a (au) |
43.346563 |
| i (deg) |
98.508477 |
| Ω (om, deg) |
97.903943 |
| ω (w, deg) |
304.107532 |
| M (ma, deg) |
0.035899 |
等級
散乱 + 全体線形
$$
M_a = (5.803 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.803 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.971 |
| k |
1.000 |
| 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 |
20:25:23.66 |
+75:33:48.2 |
HIP 100605 |
19.25 |
| 2026-02-03 12:00 |
20:25:45.66 |
+75:33:51.4 |
HIP 100605 |
19.71 |
| 2026-02-04 00:00 |
20:26:07.62 |
+75:33:55.2 |
HIP 100605 |
20.26 |
| 2026-02-04 12:00 |
20:26:29.54 |
+75:33:59.7 |
HIP 100605 |
20.90 |
| 2026-02-05 00:00 |
20:26:51.41 |
+75:34:04.9 |
HIP 100605 |
21.62 |
| 2026-02-05 12:00 |
20:27:13.24 |
+75:34:10.7 |
HIP 100605 |
22.40 |
| 2026-02-06 00:00 |
20:27:35.03 |
+75:34:17.1 |
HIP 100605 |
23.25 |
| 2026-02-06 12:00 |
20:27:56.76 |
+75:34:24.2 |
HIP 100605 |
24.15 |
| 2026-02-07 00:00 |
20:28:18.45 |
+75:34:32.0 |
HIP 100605 |
25.11 |
| 2026-02-07 12:00 |
20:28:40.08 |
+75:34:40.4 |
HIP 100605 |
26.10 |
| 2026-02-08 00:00 |
20:29:01.67 |
+75:34:49.5 |
HIP 100605 |
27.13 |
| 2026-02-08 12:00 |
20:29:23.21 |
+75:34:59.2 |
HIP 100605 |
28.20 |
| 2026-02-09 00:00 |
20:29:44.69 |
+75:35:09.5 |
HIP 101750 |
28.38 |
| 2026-02-09 12:00 |
20:30:06.12 |
+75:35:20.6 |
HIP 101750 |
27.04 |
| 2026-02-10 00:00 |
20:30:27.50 |
+75:35:32.2 |
HIP 101750 |
25.71 |
| 2026-02-10 12:00 |
20:30:48.82 |
+75:35:44.5 |
HIP 101750 |
24.38 |
| 2026-02-11 00:00 |
20:31:10.09 |
+75:35:57.5 |
HIP 101750 |
23.05 |
| 2026-02-11 12:00 |
20:31:31.30 |
+75:36:11.1 |
HIP 101750 |
21.73 |
| 2026-02-12 00:00 |
20:31:52.46 |
+75:36:25.3 |
HIP 101750 |
20.42 |
| 2026-02-12 12:00 |
20:32:13.55 |
+75:36:40.2 |
HIP 101750 |
19.11 |
| 2026-02-13 00:00 |
20:32:34.58 |
+75:36:55.7 |
HIP 101750 |
17.81 |
| 2026-02-13 12:00 |
20:32:55.56 |
+75:37:11.9 |
HIP 101750 |
16.53 |
| 2026-02-14 00:00 |
20:33:16.47 |
+75:37:28.6 |
HIP 101750 |
15.26 |
| 2026-02-14 12:00 |
20:33:37.32 |
+75:37:46.1 |
HIP 101750 |
14.00 |
| 2026-02-15 00:00 |
20:33:58.11 |
+75:38:04.1 |
HIP 101750 |
12.77 |
| 2026-02-15 12:00 |
20:34:18.83 |
+75:38:22.8 |
HIP 101750 |
11.56 |
| 2026-02-16 00:00 |
20:34:39.48 |
+75:38:42.2 |
HIP 101750 |
10.39 |
| 2026-02-16 12:00 |
20:35:00.07 |
+75:39:02.1 |
HIP 101750 |
9.27 |
| 2026-02-17 00:00 |
20:35:20.59 |
+75:39:22.7 |
HIP 101750 |
8.21 |
| 2026-02-17 12:00 |
20:35:41.04 |
+75:39:43.9 |
HIP 101750 |
7.26 |
| 2026-02-18 00:00 |
20:36:01.43 |
+75:40:05.8 |
HIP 101750 |
6.44 |
| 2026-02-18 12:00 |
20:36:21.74 |
+75:40:28.2 |
HIP 101750 |
5.82 |
| 2026-02-19 00:00 |
20:36:41.97 |
+75:40:51.3 |
HIP 101750 |
5.47 |
| 2026-02-19 12:00 |
20:37:02.14 |
+75:41:15.0 |
HIP 101750 |
5.43 |
| 2026-02-20 00:00 |
20:37:22.23 |
+75:41:39.3 |
HIP 101750 |
5.71 |
| 2026-02-20 12:00 |
20:37:42.25 |
+75:42:04.3 |
HIP 101750 |
6.27 |
| 2026-02-21 00:00 |
20:38:02.18 |
+75:42:29.8 |
HIP 101750 |
7.03 |
| 2026-02-21 12:00 |
20:38:22.05 |
+75:42:55.9 |
HIP 101750 |
7.95 |
| 2026-02-22 00:00 |
20:38:41.83 |
+75:43:22.7 |
HIP 101750 |
8.97 |
| 2026-02-22 12:00 |
20:39:01.54 |
+75:43:50.0 |
HIP 101750 |
10.05 |
| 2026-02-23 00:00 |
20:39:21.16 |
+75:44:18.0 |
HIP 101750 |
11.19 |
| 2026-02-23 12:00 |
20:39:40.70 |
+75:44:46.5 |
HIP 101750 |
12.36 |
| 2026-02-24 00:00 |
20:40:00.16 |
+75:45:15.7 |
HIP 101750 |
13.56 |