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
$$
M_a = (11.868 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.868 |
| n |
6.000 |
| gf |
0.996 |
| gb |
-0.845 |
| k |
0.800 |
| δ90 |
9.732 |
| 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) |
| 2026-03-26 00:00 |
14:38:44.26 |
-18:20:37.2 |
HIP 71654 |
28.86 |
| 2026-03-26 12:00 |
14:38:40.69 |
-18:20:15.9 |
HIP 71654 |
28.80 |
| 2026-03-27 00:00 |
14:38:37.10 |
-18:19:54.4 |
HIP 71654 |
28.78 |
| 2026-03-27 12:00 |
14:38:33.49 |
-18:19:32.7 |
HIP 71654 |
28.79 |
| 2026-03-28 00:00 |
14:38:29.84 |
-18:19:10.9 |
HIP 71654 |
28.83 |
| 2026-03-28 12:00 |
14:38:26.17 |
-18:18:48.9 |
HIP 71654 |
28.90 |
| 2026-03-29 00:00 |
14:38:22.47 |
-18:18:26.8 |
HIP 71654 |
29.00 |
| 2026-03-29 12:00 |
14:38:18.75 |
-18:18:04.5 |
HIP 71654 |
29.13 |
| 2026-03-30 00:00 |
14:38:15.00 |
-18:17:42.0 |
HIP 71654 |
29.29 |
| 2026-03-30 12:00 |
14:38:11.22 |
-18:17:19.4 |
HIP 71654 |
29.49 |
| 2026-03-31 00:00 |
14:38:07.42 |
-18:16:56.6 |
HIP 71654 |
29.72 |
| 2026-03-31 12:00 |
14:38:03.59 |
-18:16:33.7 |
HIP 71654 |
29.98 |
| 2026-04-01 00:00 |
14:37:59.74 |
-18:16:10.7 |
HIP 71654 |
30.28 |
| 2026-04-01 12:00 |
14:37:55.87 |
-18:15:47.5 |
HIP 71654 |
30.60 |
| 2026-04-02 00:00 |
14:37:51.97 |
-18:15:24.1 |
HIP 71654 |
30.96 |
| 2026-04-02 12:00 |
14:37:48.05 |
-18:15:00.6 |
HIP 71380 |
31.18 |
| 2026-04-03 00:00 |
14:37:44.11 |
-18:14:37.0 |
HIP 71380 |
30.16 |
| 2026-04-03 12:00 |
14:37:40.14 |
-18:14:13.2 |
HIP 71380 |
29.14 |
| 2026-04-04 00:00 |
14:37:36.15 |
-18:13:49.3 |
HIP 71380 |
28.11 |
| 2026-04-04 12:00 |
14:37:32.14 |
-18:13:25.2 |
HIP 71380 |
27.08 |
| 2026-04-05 00:00 |
14:37:28.11 |
-18:13:01.1 |
HIP 71380 |
26.04 |
| 2026-04-05 12:00 |
14:37:24.05 |
-18:12:36.7 |
HIP 71380 |
25.00 |
| 2026-04-06 00:00 |
14:37:19.98 |
-18:12:12.3 |
HIP 71380 |
23.95 |
| 2026-04-06 12:00 |
14:37:15.88 |
-18:11:47.7 |
HIP 71380 |
22.89 |
| 2026-04-07 00:00 |
14:37:11.77 |
-18:11:22.9 |
HIP 71380 |
21.83 |
| 2026-04-07 12:00 |
14:37:07.63 |
-18:10:58.1 |
HIP 71380 |
20.77 |
| 2026-04-08 00:00 |
14:37:03.48 |
-18:10:33.1 |
HIP 71380 |
19.70 |
| 2026-04-08 12:00 |
14:36:59.30 |
-18:10:08.0 |
HIP 71380 |
18.62 |
| 2026-04-09 00:00 |
14:36:55.11 |
-18:09:42.8 |
HIP 71380 |
17.54 |
| 2026-04-09 12:00 |
14:36:50.90 |
-18:09:17.4 |
HIP 71380 |
16.46 |
| 2026-04-10 00:00 |
14:36:46.68 |
-18:08:51.9 |
HIP 71380 |
15.37 |
| 2026-04-10 12:00 |
14:36:42.43 |
-18:08:26.3 |
HIP 71380 |
14.27 |
| 2026-04-11 00:00 |
14:36:38.17 |
-18:08:00.6 |
HIP 71380 |
13.18 |
| 2026-04-11 12:00 |
14:36:33.89 |
-18:07:34.8 |
HIP 71380 |
12.07 |
| 2026-04-12 00:00 |
14:36:29.60 |
-18:07:08.8 |
HIP 71380 |
10.97 |
| 2026-04-12 12:00 |
14:36:25.29 |
-18:06:42.8 |
HIP 71380 |
9.86 |
| 2026-04-13 00:00 |
14:36:20.96 |
-18:06:16.6 |
HIP 71380 |
8.74 |
| 2026-04-13 12:00 |
14:36:16.62 |
-18:05:50.3 |
HIP 71380 |
7.63 |
| 2026-04-14 00:00 |
14:36:12.26 |
-18:05:23.9 |
HIP 71380 |
6.51 |
| 2026-04-14 12:00 |
14:36:07.89 |
-18:04:57.4 |
HIP 71380 |
5.39 |
| 2026-04-15 00:00 |
14:36:03.51 |
-18:04:30.8 |
HIP 71380 |
4.27 |
| 2026-04-15 12:00 |
14:35:59.12 |
-18:04:04.1 |
HIP 71380 |
3.16 |
| 2026-04-16 00:00 |
14:35:54.71 |
-18:03:37.3 |
HIP 71380 |
2.07 |