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) |
| 2026-07-29 00:00 |
20:17:42.84 |
-45:08:13.4 |
HIP 100030 |
5.52 |
| 2026-07-29 12:00 |
20:17:26.49 |
-45:08:54.5 |
HIP 100030 |
5.39 |
| 2026-07-30 00:00 |
20:17:10.14 |
-45:09:34.6 |
HIP 100030 |
6.74 |
| 2026-07-30 12:00 |
20:16:53.80 |
-45:10:13.8 |
HIP 100030 |
8.90 |
| 2026-07-31 00:00 |
20:16:37.47 |
-45:10:52.0 |
HIP 100030 |
11.42 |
| 2026-07-31 12:00 |
20:16:21.15 |
-45:11:29.2 |
HIP 100030 |
14.11 |
| 2026-08-01 00:00 |
20:16:04.84 |
-45:12:05.3 |
HIP 100030 |
16.89 |
| 2026-08-01 12:00 |
20:15:48.55 |
-45:12:40.5 |
HIP 100030 |
19.70 |
| 2026-08-02 00:00 |
20:15:32.27 |
-45:13:14.7 |
HIP 99701 |
17.87 |
| 2026-08-02 12:00 |
20:15:16.02 |
-45:13:47.9 |
HIP 99701 |
15.20 |
| 2026-08-03 00:00 |
20:14:59.78 |
-45:14:20.0 |
HIP 99701 |
12.64 |
| 2026-08-03 12:00 |
20:14:43.57 |
-45:14:51.2 |
HIP 99701 |
10.27 |
| 2026-08-04 00:00 |
20:14:27.39 |
-45:15:21.3 |
HIP 99701 |
8.24 |
| 2026-08-04 12:00 |
20:14:11.23 |
-45:15:50.4 |
HIP 99701 |
6.85 |
| 2026-08-05 00:00 |
20:13:55.10 |
-45:16:18.5 |
HIP 99701 |
6.50 |
| 2026-08-05 12:00 |
20:13:39.01 |
-45:16:45.6 |
HIP 99701 |
7.35 |
| 2026-08-06 00:00 |
20:13:22.95 |
-45:17:11.7 |
HIP 99701 |
9.05 |
| 2026-08-06 12:00 |
20:13:06.92 |
-45:17:36.7 |
HIP 99701 |
11.22 |
| 2026-08-07 00:00 |
20:12:50.93 |
-45:18:00.8 |
HIP 99701 |
13.62 |
| 2026-08-07 12:00 |
20:12:34.98 |
-45:18:23.7 |
HIP 99701 |
16.16 |
| 2026-08-08 00:00 |
20:12:19.07 |
-45:18:45.7 |
HIP 99701 |
18.76 |
| 2026-08-08 12:00 |
20:12:03.21 |
-45:19:06.7 |
HIP 99373 |
19.86 |
| 2026-08-09 00:00 |
20:11:47.39 |
-45:19:26.6 |
HIP 99373 |
17.06 |
| 2026-08-09 12:00 |
20:11:31.63 |
-45:19:45.4 |
HIP 99373 |
14.28 |
| 2026-08-10 00:00 |
20:11:15.91 |
-45:20:03.3 |
HIP 99373 |
11.51 |
| 2026-08-10 12:00 |
20:11:00.25 |
-45:20:20.1 |
HIP 99373 |
8.76 |
| 2026-08-11 00:00 |
20:10:44.64 |
-45:20:35.9 |
HIP 99373 |
6.04 |
| 2026-08-11 12:00 |
20:10:29.08 |
-45:20:50.6 |
HIP 99373 |
3.41 |
| 2026-08-12 00:00 |
20:10:13.59 |
-45:21:04.3 |
HIP 99373 |
1.34 |
| 2026-08-12 12:00 |
20:09:58.16 |
-45:21:17.0 |
HIP 99339 |
2.40 |
| 2026-08-13 00:00 |
20:09:42.79 |
-45:21:28.7 |
HIP 99335 |
0.54 |
| 2026-08-13 12:00 |
20:09:27.49 |
-45:21:39.3 |
HIP 99335 |
2.72 |
| 2026-08-14 00:00 |
20:09:12.26 |
-45:21:48.9 |
HIP 99335 |
5.38 |
| 2026-08-14 12:00 |
20:08:57.09 |
-45:21:57.5 |
HIP 99335 |
8.04 |
| 2026-08-15 00:00 |
20:08:42.00 |
-45:22:05.0 |
HIP 99335 |
10.69 |
| 2026-08-15 12:00 |
20:08:26.98 |
-45:22:11.6 |
HIP 99335 |
13.33 |
| 2026-08-16 00:00 |
20:08:12.03 |
-45:22:17.1 |
HIP 99335 |
15.95 |
| 2026-08-16 12:00 |
20:07:57.17 |
-45:22:21.6 |
HIP 99335 |
18.56 |
| 2026-08-17 00:00 |
20:07:42.38 |
-45:22:25.0 |
HIP 99335 |
21.16 |
| 2026-08-17 12:00 |
20:07:27.68 |
-45:22:27.5 |
HIP 99335 |
23.74 |
| 2026-08-18 00:00 |
20:07:13.05 |
-45:22:29.0 |
HIP 99335 |
26.31 |
| 2026-08-18 12:00 |
20:06:58.52 |
-45:22:29.4 |
HIP 99012 |
25.62 |
| 2026-08-19 00:00 |
20:06:44.07 |
-45:22:28.8 |
HIP 99012 |
24.75 |