P/2014 L2 (NEOWISE)
メタデータ
| 項目 |
値 |
| Designation |
P/2014 L2 (NEOWISE) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-07-15T10:00:57.260160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:54Z |
| Obs used |
1130 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
18.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-09-05.0000000 |
| e |
0.64676281 |
| q (au) |
2.234542 |
| a (au) |
6.325896 |
| i (deg) |
5.184412 |
| Ω (om, deg) |
149.405843 |
| ω (w, deg) |
182.777950 |
| M (ma, deg) |
3.195397 |
等級
散乱 + 全体線形
$$
M_a = (8.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.912 |
| n |
6.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
12:14:05.45 |
+01:24:16.2 |
HIP 59771 |
20.08 |
| 2026-02-03 12:00 |
12:13:59.93 |
+01:25:04.7 |
HIP 59771 |
21.23 |
| 2026-02-04 00:00 |
12:13:54.32 |
+01:25:53.7 |
HIP 59771 |
22.46 |
| 2026-02-04 12:00 |
12:13:48.60 |
+01:26:43.4 |
HIP 59771 |
23.76 |
| 2026-02-05 00:00 |
12:13:42.79 |
+01:27:33.7 |
HIP 59771 |
25.12 |
| 2026-02-05 12:00 |
12:13:36.87 |
+01:28:24.5 |
HIP 59771 |
26.55 |
| 2026-02-06 00:00 |
12:13:30.86 |
+01:29:16.0 |
HIP 59771 |
28.03 |
| 2026-02-06 12:00 |
12:13:24.75 |
+01:30:08.0 |
HIP 59500 |
27.69 |
| 2026-02-07 00:00 |
12:13:18.54 |
+01:31:00.7 |
HIP 59500 |
27.30 |
| 2026-02-07 12:00 |
12:13:12.23 |
+01:31:53.9 |
HIP 59500 |
27.02 |
| 2026-02-08 00:00 |
12:13:05.83 |
+01:32:47.7 |
HIP 59500 |
26.85 |
| 2026-02-08 12:00 |
12:12:59.33 |
+01:33:42.0 |
HIP 59500 |
26.80 |
| 2026-02-09 00:00 |
12:12:52.74 |
+01:34:37.0 |
HIP 59500 |
26.88 |
| 2026-02-09 12:00 |
12:12:46.05 |
+01:35:32.5 |
HIP 59500 |
27.09 |
| 2026-02-10 00:00 |
12:12:39.27 |
+01:36:28.5 |
HIP 59500 |
27.43 |
| 2026-02-10 12:00 |
12:12:32.40 |
+01:37:25.1 |
HIP 59500 |
27.91 |
| 2026-02-11 00:00 |
12:12:25.43 |
+01:38:22.3 |
HIP 59500 |
28.52 |
| 2026-02-11 12:00 |
12:12:18.37 |
+01:39:19.9 |
HIP 59500 |
29.26 |
| 2026-02-12 00:00 |
12:12:11.22 |
+01:40:18.1 |
HIP 59500 |
30.13 |
| 2026-02-12 12:00 |
12:12:03.97 |
+01:41:16.9 |
HIP 59500 |
31.11 |
| 2026-02-13 00:00 |
12:11:56.64 |
+01:42:16.2 |
HIP 59500 |
32.21 |
| 2026-02-13 12:00 |
12:11:49.22 |
+01:43:15.9 |
HIP 59500 |
33.41 |
| 2026-02-14 00:00 |
12:11:41.71 |
+01:44:16.2 |
HIP 59285 |
31.59 |
| 2026-02-14 12:00 |
12:11:34.11 |
+01:45:17.0 |
HIP 59285 |
29.48 |
| 2026-02-15 00:00 |
12:11:26.43 |
+01:46:18.3 |
HIP 59285 |
27.35 |
| 2026-02-15 12:00 |
12:11:18.66 |
+01:47:20.1 |
HIP 59285 |
25.20 |
| 2026-02-16 00:00 |
12:11:10.81 |
+01:48:22.4 |
HIP 59285 |
23.04 |
| 2026-02-16 12:00 |
12:11:02.87 |
+01:49:25.1 |
HIP 59285 |
20.87 |
| 2026-02-17 00:00 |
12:10:54.85 |
+01:50:28.3 |
HIP 59285 |
18.70 |
| 2026-02-17 12:00 |
12:10:46.74 |
+01:51:32.0 |
HIP 59285 |
16.53 |
| 2026-02-18 00:00 |
12:10:38.56 |
+01:52:36.1 |
HIP 59285 |
14.37 |
| 2026-02-18 12:00 |
12:10:30.29 |
+01:53:40.7 |
HIP 59285 |
12.25 |
| 2026-02-19 00:00 |
12:10:21.95 |
+01:54:45.7 |
HIP 59285 |
10.20 |
| 2026-02-19 12:00 |
12:10:13.52 |
+01:55:51.1 |
HIP 59285 |
8.29 |
| 2026-02-20 00:00 |
12:10:05.02 |
+01:56:57.0 |
HIP 59285 |
6.67 |
| 2026-02-20 12:00 |
12:09:56.44 |
+01:58:03.3 |
HIP 59285 |
5.62 |
| 2026-02-21 00:00 |
12:09:47.79 |
+01:59:10.0 |
HIP 59285 |
5.51 |
| 2026-02-21 12:00 |
12:09:39.06 |
+02:00:17.0 |
HIP 59285 |
6.41 |
| 2026-02-22 00:00 |
12:09:30.26 |
+02:01:24.5 |
HIP 59285 |
8.00 |
| 2026-02-22 12:00 |
12:09:21.39 |
+02:02:32.4 |
HIP 59285 |
9.97 |
| 2026-02-23 00:00 |
12:09:12.45 |
+02:03:40.6 |
HIP 59285 |
12.15 |
| 2026-02-23 12:00 |
12:09:03.44 |
+02:04:49.2 |
HIP 59285 |
14.45 |
| 2026-02-24 00:00 |
12:08:54.36 |
+02:05:58.2 |
HIP 59285 |
16.83 |