メタデータ
| 項目 |
値 |
| Designation |
C/2014 W8 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-09-21T16:55:27.336000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
32 |
| NEO |
- |
| M1 |
10.600 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-11-27.0000000 |
| e |
1.00113510 |
| q (au) |
4.898630 |
| a (au) |
-4315.589052 |
| i (deg) |
41.111029 |
| Ω (om, deg) |
224.558594 |
| ω (w, deg) |
230.783005 |
| M (ma, deg) |
-0.001038 |
等級
散乱 + 全体線形
$$
M_a = (11.870 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.870 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.845 |
| k |
0.800 |
| 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 |
14:30:01.70 |
-16:48:47.2 |
HIP 70795 |
21.18 |
| 2026-09-20 12:00 |
14:30:05.87 |
-16:48:58.9 |
HIP 70795 |
22.01 |
| 2026-09-21 00:00 |
14:30:10.07 |
-16:49:10.7 |
HIP 70795 |
22.86 |
| 2026-09-21 12:00 |
14:30:14.30 |
-16:49:22.6 |
HIP 70795 |
23.72 |
| 2026-09-22 00:00 |
14:30:18.55 |
-16:49:34.7 |
HIP 70795 |
24.61 |
| 2026-09-22 12:00 |
14:30:22.82 |
-16:49:46.9 |
HIP 70795 |
25.51 |
| 2026-09-23 00:00 |
14:30:27.12 |
-16:49:59.2 |
HIP 70795 |
26.42 |
| 2026-09-23 12:00 |
14:30:31.44 |
-16:50:11.7 |
HIP 70795 |
27.35 |
| 2026-09-24 00:00 |
14:30:35.78 |
-16:50:24.2 |
HIP 70795 |
28.30 |
| 2026-09-24 12:00 |
14:30:40.15 |
-16:50:36.9 |
HIP 70795 |
29.25 |
| 2026-09-25 00:00 |
14:30:44.54 |
-16:50:49.8 |
HIP 70795 |
30.22 |
| 2026-09-25 12:00 |
14:30:48.95 |
-16:51:02.7 |
HIP 70795 |
31.20 |
| 2026-09-26 00:00 |
14:30:53.39 |
-16:51:15.8 |
HIP 70795 |
32.19 |
| 2026-09-26 12:00 |
14:30:57.85 |
-16:51:29.0 |
HIP 71063 |
32.98 |
| 2026-09-27 00:00 |
14:31:02.32 |
-16:51:42.3 |
HIP 71063 |
32.73 |
| 2026-09-27 12:00 |
14:31:06.83 |
-16:51:55.7 |
HIP 71063 |
32.52 |
| 2026-09-28 00:00 |
14:31:11.35 |
-16:52:09.3 |
HIP 71063 |
32.35 |
| 2026-09-28 12:00 |
14:31:15.89 |
-16:52:23.0 |
HIP 71063 |
32.21 |
| 2026-09-29 00:00 |
14:31:20.46 |
-16:52:36.7 |
HIP 71063 |
32.11 |
| 2026-09-29 12:00 |
14:31:25.04 |
-16:52:50.6 |
HIP 71063 |
32.05 |
| 2026-09-30 00:00 |
14:31:29.65 |
-16:53:04.6 |
HIP 71063 |
32.03 |
| 2026-09-30 12:00 |
14:31:34.27 |
-16:53:18.8 |
HIP 71063 |
32.05 |
| 2026-10-01 00:00 |
14:31:38.92 |
-16:53:33.0 |
HIP 71063 |
32.11 |
| 2026-10-01 12:00 |
14:31:43.59 |
-16:53:47.3 |
HIP 71063 |
32.21 |
| 2026-10-02 00:00 |
14:31:48.27 |
-16:54:01.8 |
HIP 71063 |
32.35 |
| 2026-10-02 12:00 |
14:31:52.98 |
-16:54:16.3 |
HIP 71234 |
31.70 |
| 2026-10-03 00:00 |
14:31:57.70 |
-16:54:31.0 |
HIP 71234 |
30.63 |
| 2026-10-03 12:00 |
14:32:02.45 |
-16:54:45.7 |
HIP 71234 |
29.56 |
| 2026-10-04 00:00 |
14:32:07.21 |
-16:55:00.6 |
HIP 71234 |
28.49 |
| 2026-10-04 12:00 |
14:32:11.99 |
-16:55:15.6 |
HIP 71234 |
27.42 |
| 2026-10-05 00:00 |
14:32:16.79 |
-16:55:30.6 |
HIP 71234 |
26.36 |
| 2026-10-05 12:00 |
14:32:21.60 |
-16:55:45.8 |
HIP 71234 |
25.31 |
| 2026-10-06 00:00 |
14:32:26.44 |
-16:56:01.0 |
HIP 71234 |
24.27 |
| 2026-10-06 12:00 |
14:32:31.29 |
-16:56:16.4 |
HIP 71234 |
23.23 |
| 2026-10-07 00:00 |
14:32:36.15 |
-16:56:31.8 |
HIP 71234 |
22.21 |
| 2026-10-07 12:00 |
14:32:41.04 |
-16:56:47.4 |
HIP 71234 |
21.20 |
| 2026-10-08 00:00 |
14:32:45.94 |
-16:57:03.0 |
HIP 71234 |
20.21 |
| 2026-10-08 12:00 |
14:32:50.86 |
-16:57:18.7 |
HIP 71234 |
19.24 |
| 2026-10-09 00:00 |
14:32:55.79 |
-16:57:34.6 |
HIP 71234 |
18.30 |
| 2026-10-09 12:00 |
14:33:00.74 |
-16:57:50.5 |
HIP 71234 |
17.39 |
| 2026-10-10 00:00 |
14:33:05.70 |
-16:58:06.4 |
HIP 71234 |
16.51 |
| 2026-10-10 12:00 |
14:33:10.68 |
-16:58:22.5 |
HIP 71234 |
15.68 |
| 2026-10-11 00:00 |
14:33:15.67 |
-16:58:38.7 |
HIP 71234 |
14.90 |