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) |
| 2026-07-29 00:00 |
14:25:42.18 |
-16:44:14.0 |
HIP 70554 |
26.53 |
| 2026-07-29 12:00 |
14:25:42.66 |
-16:44:06.4 |
HIP 70554 |
26.38 |
| 2026-07-30 00:00 |
14:25:43.17 |
-16:43:59.0 |
HIP 70554 |
26.25 |
| 2026-07-30 12:00 |
14:25:43.72 |
-16:43:51.8 |
HIP 70554 |
26.11 |
| 2026-07-31 00:00 |
14:25:44.32 |
-16:43:44.8 |
HIP 70554 |
25.98 |
| 2026-07-31 12:00 |
14:25:44.95 |
-16:43:38.0 |
HIP 70554 |
25.85 |
| 2026-08-01 00:00 |
14:25:45.63 |
-16:43:31.4 |
HIP 70554 |
25.72 |
| 2026-08-01 12:00 |
14:25:46.35 |
-16:43:25.0 |
HIP 70554 |
25.60 |
| 2026-08-02 00:00 |
14:25:47.11 |
-16:43:18.9 |
HIP 70554 |
25.48 |
| 2026-08-02 12:00 |
14:25:47.90 |
-16:43:12.9 |
HIP 70554 |
25.36 |
| 2026-08-03 00:00 |
14:25:48.74 |
-16:43:07.1 |
HIP 70554 |
25.25 |
| 2026-08-03 12:00 |
14:25:49.62 |
-16:43:01.6 |
HIP 70554 |
25.14 |
| 2026-08-04 00:00 |
14:25:50.54 |
-16:42:56.2 |
HIP 70554 |
25.03 |
| 2026-08-04 12:00 |
14:25:51.50 |
-16:42:51.1 |
HIP 70554 |
24.93 |
| 2026-08-05 00:00 |
14:25:52.50 |
-16:42:46.1 |
HIP 70554 |
24.84 |
| 2026-08-05 12:00 |
14:25:53.54 |
-16:42:41.4 |
HIP 70554 |
24.75 |
| 2026-08-06 00:00 |
14:25:54.62 |
-16:42:36.8 |
HIP 70554 |
24.67 |
| 2026-08-06 12:00 |
14:25:55.74 |
-16:42:32.5 |
HIP 70554 |
24.59 |
| 2026-08-07 00:00 |
14:25:56.90 |
-16:42:28.4 |
HIP 70554 |
24.52 |
| 2026-08-07 12:00 |
14:25:58.11 |
-16:42:24.5 |
HIP 70554 |
24.45 |
| 2026-08-08 00:00 |
14:25:59.35 |
-16:42:20.7 |
HIP 70554 |
24.40 |
| 2026-08-08 12:00 |
14:26:00.63 |
-16:42:17.2 |
HIP 70554 |
24.35 |
| 2026-08-09 00:00 |
14:26:01.95 |
-16:42:13.9 |
HIP 70554 |
24.31 |
| 2026-08-09 12:00 |
14:26:03.31 |
-16:42:10.8 |
HIP 70554 |
24.27 |
| 2026-08-10 00:00 |
14:26:04.71 |
-16:42:07.9 |
HIP 70554 |
24.25 |
| 2026-08-10 12:00 |
14:26:06.15 |
-16:42:05.2 |
HIP 70554 |
24.23 |
| 2026-08-11 00:00 |
14:26:07.63 |
-16:42:02.7 |
HIP 70554 |
24.22 |
| 2026-08-11 12:00 |
14:26:09.15 |
-16:42:00.5 |
HIP 70554 |
24.22 |
| 2026-08-12 00:00 |
14:26:10.71 |
-16:41:58.4 |
HIP 70554 |
24.24 |
| 2026-08-12 12:00 |
14:26:12.31 |
-16:41:56.5 |
HIP 70554 |
24.26 |
| 2026-08-13 00:00 |
14:26:13.95 |
-16:41:54.8 |
HIP 70554 |
24.29 |
| 2026-08-13 12:00 |
14:26:15.62 |
-16:41:53.4 |
HIP 70554 |
24.34 |
| 2026-08-14 00:00 |
14:26:17.34 |
-16:41:52.1 |
HIP 70554 |
24.40 |
| 2026-08-14 12:00 |
14:26:19.10 |
-16:41:51.0 |
HIP 70554 |
24.47 |
| 2026-08-15 00:00 |
14:26:20.89 |
-16:41:50.1 |
HIP 70554 |
24.55 |
| 2026-08-15 12:00 |
14:26:22.72 |
-16:41:49.5 |
HIP 70554 |
24.64 |
| 2026-08-16 00:00 |
14:26:24.59 |
-16:41:49.0 |
HIP 70554 |
24.75 |
| 2026-08-16 12:00 |
14:26:26.50 |
-16:41:48.7 |
HIP 70554 |
24.87 |
| 2026-08-17 00:00 |
14:26:28.45 |
-16:41:48.6 |
HIP 70554 |
25.01 |
| 2026-08-17 12:00 |
14:26:30.44 |
-16:41:48.8 |
HIP 70554 |
25.15 |
| 2026-08-18 00:00 |
14:26:32.46 |
-16:41:49.1 |
HIP 70554 |
25.32 |
| 2026-08-18 12:00 |
14:26:34.52 |
-16:41:49.6 |
HIP 70554 |
25.50 |
| 2026-08-19 00:00 |
14:26:36.62 |
-16:41:50.3 |
HIP 70554 |
25.69 |