メタデータ
| 項目 |
値 |
| Designation |
P/2014 X1 (Elenin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-01-07T17:47:02.451840Z |
| Orbit solution date (soln_date, UTC) |
2024-10-10T18:10:33Z |
| Obs used |
630 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
6.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-31.0000000 |
| e |
0.71002420 |
| q (au) |
1.814883 |
| a (au) |
6.258740 |
| i (deg) |
25.971382 |
| Ω (om, deg) |
61.569156 |
| ω (w, deg) |
34.367877 |
| M (ma, deg) |
1.464080 |
等級
散乱 + 全体線形
$$
M_a = (14.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.535 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2014-09-04 |
2015-01-06 |
+19.0602 |
-4.445 |
| 2015-01-08 |
2016-03-15 |
+3.0066 |
-1.877 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:43:36.08 |
-41:28:53.0 |
HIP 102204 |
19.69 |
| 2026-05-12 12:00 |
20:43:36.35 |
-41:30:19.7 |
HIP 102434 |
20.44 |
| 2026-05-13 00:00 |
20:43:36.48 |
-41:31:46.8 |
HIP 102434 |
20.19 |
| 2026-05-13 12:00 |
20:43:36.45 |
-41:33:14.4 |
HIP 102434 |
20.07 |
| 2026-05-14 00:00 |
20:43:36.28 |
-41:34:42.3 |
HIP 102434 |
20.08 |
| 2026-05-14 12:00 |
20:43:35.96 |
-41:36:10.7 |
HIP 102434 |
20.22 |
| 2026-05-15 00:00 |
20:43:35.50 |
-41:37:39.5 |
HIP 102434 |
20.50 |
| 2026-05-15 12:00 |
20:43:34.88 |
-41:39:08.7 |
HIP 102434 |
20.91 |
| 2026-05-16 00:00 |
20:43:34.12 |
-41:40:38.3 |
HIP 102434 |
21.44 |
| 2026-05-16 12:00 |
20:43:33.21 |
-41:42:08.3 |
HIP 102307 |
20.87 |
| 2026-05-17 00:00 |
20:43:32.15 |
-41:43:38.7 |
HIP 102307 |
19.39 |
| 2026-05-17 12:00 |
20:43:30.94 |
-41:45:09.4 |
HIP 102307 |
17.92 |
| 2026-05-18 00:00 |
20:43:29.58 |
-41:46:40.5 |
HIP 102307 |
16.46 |
| 2026-05-18 12:00 |
20:43:28.07 |
-41:48:12.0 |
HIP 102307 |
15.02 |
| 2026-05-19 00:00 |
20:43:26.41 |
-41:49:43.8 |
HIP 102307 |
13.59 |
| 2026-05-19 12:00 |
20:43:24.60 |
-41:51:16.0 |
HIP 102307 |
12.21 |
| 2026-05-20 00:00 |
20:43:22.64 |
-41:52:48.4 |
HIP 102307 |
10.88 |
| 2026-05-20 12:00 |
20:43:20.54 |
-41:54:21.3 |
HIP 102307 |
9.64 |
| 2026-05-21 00:00 |
20:43:18.28 |
-41:55:54.4 |
HIP 102307 |
8.52 |
| 2026-05-21 12:00 |
20:43:15.87 |
-41:57:27.8 |
HIP 102307 |
7.61 |
| 2026-05-22 00:00 |
20:43:13.32 |
-41:59:01.6 |
HIP 102245 |
6.52 |
| 2026-05-22 12:00 |
20:43:10.61 |
-42:00:35.6 |
HIP 102245 |
4.88 |
| 2026-05-23 00:00 |
20:43:07.76 |
-42:02:09.9 |
HIP 102245 |
3.23 |
| 2026-05-23 12:00 |
20:43:04.75 |
-42:03:44.5 |
HIP 102245 |
1.61 |
| 2026-05-24 00:00 |
20:43:01.60 |
-42:05:19.4 |
HIP 102245 |
0.58 |
| 2026-05-24 12:00 |
20:42:58.29 |
-42:06:54.5 |
HIP 102245 |
1.96 |
| 2026-05-25 00:00 |
20:42:54.84 |
-42:08:29.9 |
HIP 102245 |
3.64 |
| 2026-05-25 12:00 |
20:42:51.24 |
-42:10:05.5 |
HIP 102245 |
5.36 |
| 2026-05-26 00:00 |
20:42:47.49 |
-42:11:41.4 |
HIP 102245 |
7.10 |
| 2026-05-26 12:00 |
20:42:43.59 |
-42:13:17.5 |
HIP 102245 |
8.85 |
| 2026-05-27 00:00 |
20:42:39.54 |
-42:14:53.8 |
HIP 102245 |
10.63 |
| 2026-05-27 12:00 |
20:42:35.34 |
-42:16:30.3 |
HIP 102112 |
10.95 |
| 2026-05-28 00:00 |
20:42:30.99 |
-42:18:07.0 |
HIP 102112 |
10.36 |
| 2026-05-28 12:00 |
20:42:26.49 |
-42:19:44.0 |
HIP 102112 |
10.03 |
| 2026-05-29 00:00 |
20:42:21.85 |
-42:21:21.1 |
HIP 102112 |
10.02 |
| 2026-05-29 12:00 |
20:42:17.05 |
-42:22:58.3 |
HIP 102112 |
10.31 |
| 2026-05-30 00:00 |
20:42:12.11 |
-42:24:35.8 |
HIP 102112 |
10.90 |
| 2026-05-30 12:00 |
20:42:07.02 |
-42:26:13.4 |
HIP 102112 |
11.74 |
| 2026-05-31 00:00 |
20:42:01.78 |
-42:27:51.1 |
HIP 102112 |
12.81 |
| 2026-05-31 12:00 |
20:41:56.40 |
-42:29:29.0 |
HIP 102057 |
12.57 |
| 2026-06-01 00:00 |
20:41:50.86 |
-42:31:07.1 |
HIP 102057 |
12.54 |
| 2026-06-01 12:00 |
20:41:45.18 |
-42:32:45.2 |
HIP 102057 |
12.79 |
| 2026-06-02 00:00 |
20:41:39.35 |
-42:34:23.5 |
HIP 102057 |
13.31 |