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) |
| 2026-09-20 00:00 |
12:15:25.43 |
+01:11:23.9 |
HIP 59771 |
18.14 |
| 2026-09-20 12:00 |
12:15:40.04 |
+01:09:51.8 |
HIP 59771 |
20.12 |
| 2026-09-21 00:00 |
12:15:54.66 |
+01:08:19.6 |
HIP 59771 |
22.63 |
| 2026-09-21 12:00 |
12:16:09.29 |
+01:06:47.4 |
HIP 59771 |
25.51 |
| 2026-09-22 00:00 |
12:16:23.94 |
+01:05:15.2 |
HIP 59771 |
28.66 |
| 2026-09-22 12:00 |
12:16:38.61 |
+01:03:42.9 |
HIP 59771 |
31.99 |
| 2026-09-23 00:00 |
12:16:53.28 |
+01:02:10.7 |
HIP 60062 |
32.85 |
| 2026-09-23 12:00 |
12:17:07.97 |
+01:00:38.5 |
HIP 60062 |
29.74 |
| 2026-09-24 00:00 |
12:17:22.67 |
+00:59:06.3 |
HIP 60062 |
26.86 |
| 2026-09-24 12:00 |
12:17:37.38 |
+00:57:34.1 |
HIP 60062 |
24.29 |
| 2026-09-25 00:00 |
12:17:52.10 |
+00:56:01.9 |
HIP 60062 |
22.14 |
| 2026-09-25 12:00 |
12:18:06.82 |
+00:54:29.7 |
HIP 60062 |
20.55 |
| 2026-09-26 00:00 |
12:18:21.56 |
+00:52:57.5 |
HIP 60062 |
19.64 |
| 2026-09-26 12:00 |
12:18:36.31 |
+00:51:25.4 |
HIP 60062 |
19.53 |
| 2026-09-27 00:00 |
12:18:51.07 |
+00:49:53.3 |
HIP 60062 |
20.22 |
| 2026-09-27 12:00 |
12:19:05.83 |
+00:48:21.2 |
HIP 60062 |
21.64 |
| 2026-09-28 00:00 |
12:19:20.60 |
+00:46:49.1 |
HIP 60062 |
23.65 |
| 2026-09-28 12:00 |
12:19:35.38 |
+00:45:17.1 |
HIP 60062 |
26.13 |
| 2026-09-29 00:00 |
12:19:50.16 |
+00:43:45.1 |
HIP 60062 |
28.95 |
| 2026-09-29 12:00 |
12:20:04.95 |
+00:42:13.2 |
HIP 60062 |
32.02 |
| 2026-09-30 00:00 |
12:20:19.75 |
+00:40:41.3 |
HIP 60062 |
35.28 |
| 2026-09-30 12:00 |
12:20:34.55 |
+00:39:09.4 |
HIP 60062 |
38.68 |
| 2026-10-01 00:00 |
12:20:49.35 |
+00:37:37.6 |
HIP 60440 |
40.62 |
| 2026-10-01 12:00 |
12:21:04.16 |
+00:36:05.9 |
HIP 60440 |
37.20 |
| 2026-10-02 00:00 |
12:21:18.97 |
+00:34:34.2 |
HIP 60440 |
33.90 |
| 2026-10-02 12:00 |
12:21:33.79 |
+00:33:02.6 |
HIP 60440 |
30.76 |
| 2026-10-03 00:00 |
12:21:48.61 |
+00:31:31.0 |
HIP 60440 |
27.86 |
| 2026-10-03 12:00 |
12:22:03.43 |
+00:29:59.5 |
HIP 60440 |
25.25 |
| 2026-10-04 00:00 |
12:22:18.25 |
+00:28:28.1 |
HIP 60440 |
23.05 |
| 2026-10-04 12:00 |
12:22:33.07 |
+00:26:56.8 |
HIP 60440 |
21.37 |
| 2026-10-05 00:00 |
12:22:47.89 |
+00:25:25.5 |
HIP 60440 |
20.36 |
| 2026-10-05 12:00 |
12:23:02.72 |
+00:23:54.3 |
HIP 60440 |
20.11 |
| 2026-10-06 00:00 |
12:23:17.54 |
+00:22:23.3 |
HIP 60440 |
20.64 |
| 2026-10-06 12:00 |
12:23:32.36 |
+00:20:52.3 |
HIP 60440 |
21.90 |
| 2026-10-07 00:00 |
12:23:47.18 |
+00:19:21.4 |
HIP 60440 |
23.78 |
| 2026-10-07 12:00 |
12:24:01.99 |
+00:17:50.6 |
HIP 60440 |
26.14 |
| 2026-10-08 00:00 |
12:24:16.80 |
+00:16:19.9 |
HIP 60440 |
28.86 |
| 2026-10-08 12:00 |
12:24:31.61 |
+00:14:49.4 |
HIP 60688 |
30.83 |
| 2026-10-09 00:00 |
12:24:46.41 |
+00:13:18.9 |
HIP 60688 |
28.64 |
| 2026-10-09 12:00 |
12:25:01.21 |
+00:11:48.6 |
HIP 60688 |
26.86 |
| 2026-10-10 00:00 |
12:25:16.00 |
+00:10:18.4 |
HIP 60688 |
25.59 |
| 2026-10-10 12:00 |
12:25:30.79 |
+00:08:48.3 |
HIP 60748 |
22.50 |
| 2026-10-11 00:00 |
12:25:45.57 |
+00:07:18.4 |
HIP 60748 |
18.74 |