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 |
-0.998 |
| 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) |
| 2026-06-01 00:00 |
20:55:40.61 |
+79:11:25.4 |
HIP 103602 |
12.57 |
| 2026-06-01 12:00 |
20:55:24.02 |
+79:12:31.3 |
HIP 103602 |
12.69 |
| 2026-06-02 00:00 |
20:55:07.17 |
+79:13:36.8 |
HIP 103602 |
12.97 |
| 2026-06-02 12:00 |
20:54:50.04 |
+79:14:41.8 |
HIP 103602 |
13.39 |
| 2026-06-03 00:00 |
20:54:32.65 |
+79:15:46.5 |
HIP 103602 |
13.93 |
| 2026-06-03 12:00 |
20:54:14.98 |
+79:16:50.7 |
HIP 103602 |
14.59 |
| 2026-06-04 00:00 |
20:53:57.05 |
+79:17:54.5 |
HIP 103602 |
15.36 |
| 2026-06-04 12:00 |
20:53:38.85 |
+79:18:57.9 |
HIP 103602 |
16.21 |
| 2026-06-05 00:00 |
20:53:20.39 |
+79:20:00.8 |
HIP 103602 |
17.13 |
| 2026-06-05 12:00 |
20:53:01.65 |
+79:21:03.3 |
HIP 103602 |
18.11 |
| 2026-06-06 00:00 |
20:52:42.65 |
+79:22:05.4 |
HIP 103602 |
19.15 |
| 2026-06-06 12:00 |
20:52:23.38 |
+79:23:06.9 |
HIP 103602 |
20.24 |
| 2026-06-07 00:00 |
20:52:03.85 |
+79:24:08.0 |
HIP 103602 |
21.36 |
| 2026-06-07 12:00 |
20:51:44.04 |
+79:25:08.6 |
HIP 103602 |
22.52 |
| 2026-06-08 00:00 |
20:51:23.98 |
+79:26:08.7 |
HIP 103602 |
23.70 |
| 2026-06-08 12:00 |
20:51:03.65 |
+79:27:08.4 |
HIP 103602 |
24.91 |
| 2026-06-09 00:00 |
20:50:43.05 |
+79:28:07.5 |
HIP 103602 |
26.14 |
| 2026-06-09 12:00 |
20:50:22.20 |
+79:29:06.1 |
HIP 103602 |
27.38 |
| 2026-06-10 00:00 |
20:50:01.08 |
+79:30:04.2 |
HIP 103602 |
28.65 |
| 2026-06-10 12:00 |
20:49:39.69 |
+79:31:01.8 |
HIP 103602 |
29.93 |
| 2026-06-11 00:00 |
20:49:18.05 |
+79:31:58.9 |
HIP 103602 |
31.22 |
| 2026-06-11 12:00 |
20:48:56.15 |
+79:32:55.4 |
HIP 101713 |
32.40 |
| 2026-06-12 00:00 |
20:48:33.99 |
+79:33:51.3 |
HIP 101713 |
31.42 |
| 2026-06-12 12:00 |
20:48:11.57 |
+79:34:46.8 |
HIP 101713 |
30.46 |
| 2026-06-13 00:00 |
20:47:48.89 |
+79:35:41.6 |
HIP 101713 |
29.52 |
| 2026-06-13 12:00 |
20:47:25.96 |
+79:36:35.9 |
HIP 101713 |
28.61 |
| 2026-06-14 00:00 |
20:47:02.78 |
+79:37:29.6 |
HIP 101713 |
27.73 |
| 2026-06-14 12:00 |
20:46:39.34 |
+79:38:22.7 |
HIP 101713 |
26.88 |
| 2026-06-15 00:00 |
20:46:15.65 |
+79:39:15.2 |
HIP 101713 |
26.07 |
| 2026-06-15 12:00 |
20:45:51.72 |
+79:40:07.1 |
HIP 101713 |
25.29 |
| 2026-06-16 00:00 |
20:45:27.53 |
+79:40:58.4 |
HIP 101713 |
24.55 |
| 2026-06-16 12:00 |
20:45:03.10 |
+79:41:49.1 |
HIP 101713 |
23.87 |
| 2026-06-17 00:00 |
20:44:38.43 |
+79:42:39.1 |
HIP 101713 |
23.23 |
| 2026-06-17 12:00 |
20:44:13.52 |
+79:43:28.5 |
HIP 101713 |
22.65 |
| 2026-06-18 00:00 |
20:43:48.36 |
+79:44:17.3 |
HIP 101713 |
22.12 |
| 2026-06-18 12:00 |
20:43:22.97 |
+79:45:05.5 |
HIP 101713 |
21.67 |
| 2026-06-19 00:00 |
20:42:57.34 |
+79:45:53.0 |
HIP 101713 |
21.28 |
| 2026-06-19 12:00 |
20:42:31.48 |
+79:46:39.8 |
HIP 101713 |
20.97 |
| 2026-06-20 00:00 |
20:42:05.39 |
+79:47:25.9 |
HIP 101713 |
20.73 |
| 2026-06-20 12:00 |
20:41:39.07 |
+79:48:11.4 |
HIP 101713 |
20.57 |
| 2026-06-21 00:00 |
20:41:12.52 |
+79:48:56.2 |
HIP 101713 |
20.49 |
| 2026-06-21 12:00 |
20:40:45.75 |
+79:49:40.4 |
HIP 101713 |
20.50 |
| 2026-06-22 00:00 |
20:40:18.76 |
+79:50:23.8 |
HIP 101713 |
20.59 |