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) |
| 2026-05-12 00:00 |
14:31:58.89 |
-17:38:58.1 |
HIP 71098 |
14.94 |
| 2026-05-12 12:00 |
14:31:54.43 |
-17:38:28.9 |
HIP 71098 |
15.80 |
| 2026-05-13 00:00 |
14:31:49.97 |
-17:37:59.8 |
HIP 71098 |
16.69 |
| 2026-05-13 12:00 |
14:31:45.53 |
-17:37:30.7 |
HIP 71098 |
17.62 |
| 2026-05-14 00:00 |
14:31:41.10 |
-17:37:01.6 |
HIP 71098 |
18.57 |
| 2026-05-14 12:00 |
14:31:36.69 |
-17:36:32.5 |
HIP 71098 |
19.55 |
| 2026-05-15 00:00 |
14:31:32.28 |
-17:36:03.5 |
HIP 71098 |
20.54 |
| 2026-05-15 12:00 |
14:31:27.89 |
-17:35:34.4 |
HIP 71098 |
21.54 |
| 2026-05-16 00:00 |
14:31:23.51 |
-17:35:05.4 |
HIP 71098 |
22.56 |
| 2026-05-16 12:00 |
14:31:19.14 |
-17:34:36.4 |
HIP 71098 |
23.59 |
| 2026-05-17 00:00 |
14:31:14.78 |
-17:34:07.5 |
HIP 71098 |
24.62 |
| 2026-05-17 12:00 |
14:31:10.44 |
-17:33:38.6 |
HIP 71098 |
25.66 |
| 2026-05-18 00:00 |
14:31:06.12 |
-17:33:09.7 |
HIP 71098 |
26.71 |
| 2026-05-18 12:00 |
14:31:01.81 |
-17:32:40.8 |
HIP 71098 |
27.76 |
| 2026-05-19 00:00 |
14:30:57.51 |
-17:32:12.0 |
HIP 71098 |
28.81 |
| 2026-05-19 12:00 |
14:30:53.23 |
-17:31:43.3 |
HIP 71098 |
29.87 |
| 2026-05-20 00:00 |
14:30:48.97 |
-17:31:14.5 |
HIP 71098 |
30.93 |
| 2026-05-20 12:00 |
14:30:44.72 |
-17:30:45.9 |
HIP 71098 |
31.99 |
| 2026-05-21 00:00 |
14:30:40.49 |
-17:30:17.2 |
HIP 70888 |
32.67 |
| 2026-05-21 12:00 |
14:30:36.28 |
-17:29:48.6 |
HIP 70888 |
32.73 |
| 2026-05-22 00:00 |
14:30:32.08 |
-17:29:20.1 |
HIP 70888 |
32.83 |
| 2026-05-22 12:00 |
14:30:27.91 |
-17:28:51.6 |
HIP 70888 |
32.97 |
| 2026-05-23 00:00 |
14:30:23.75 |
-17:28:23.2 |
HIP 70888 |
33.15 |
| 2026-05-23 12:00 |
14:30:19.61 |
-17:27:54.8 |
HIP 70801 |
32.31 |
| 2026-05-24 00:00 |
14:30:15.49 |
-17:27:26.5 |
HIP 70801 |
31.29 |
| 2026-05-24 12:00 |
14:30:11.39 |
-17:26:58.3 |
HIP 70801 |
30.29 |
| 2026-05-25 00:00 |
14:30:07.30 |
-17:26:30.1 |
HIP 70801 |
29.29 |
| 2026-05-25 12:00 |
14:30:03.24 |
-17:26:02.0 |
HIP 70801 |
28.30 |
| 2026-05-26 00:00 |
14:29:59.20 |
-17:25:33.9 |
HIP 70801 |
27.32 |
| 2026-05-26 12:00 |
14:29:55.18 |
-17:25:05.9 |
HIP 70801 |
26.35 |
| 2026-05-27 00:00 |
14:29:51.18 |
-17:24:38.0 |
HIP 70801 |
25.39 |
| 2026-05-27 12:00 |
14:29:47.20 |
-17:24:10.2 |
HIP 70801 |
24.45 |
| 2026-05-28 00:00 |
14:29:43.25 |
-17:23:42.4 |
HIP 70801 |
23.52 |
| 2026-05-28 12:00 |
14:29:39.31 |
-17:23:14.7 |
HIP 70801 |
22.61 |
| 2026-05-29 00:00 |
14:29:35.40 |
-17:22:47.1 |
HIP 70801 |
21.71 |
| 2026-05-29 12:00 |
14:29:31.51 |
-17:22:19.6 |
HIP 70801 |
20.82 |
| 2026-05-30 00:00 |
14:29:27.64 |
-17:21:52.1 |
HIP 70801 |
19.96 |
| 2026-05-30 12:00 |
14:29:23.80 |
-17:21:24.7 |
HIP 70801 |
19.12 |
| 2026-05-31 00:00 |
14:29:19.98 |
-17:20:57.4 |
HIP 70801 |
18.30 |
| 2026-05-31 12:00 |
14:29:16.19 |
-17:20:30.2 |
HIP 70801 |
17.50 |
| 2026-06-01 00:00 |
14:29:12.41 |
-17:20:03.1 |
HIP 70801 |
16.73 |
| 2026-06-01 12:00 |
14:29:08.67 |
-17:19:36.1 |
HIP 70801 |
15.99 |
| 2026-06-02 00:00 |
14:29:04.95 |
-17:19:09.2 |
HIP 70801 |
15.29 |