C/2014 W8 (PANSTARRS)
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) |
| 2026-02-03 00:00 |
14:41:30.49 |
-18:39:52.3 |
HIP 71850 |
4.30 |
| 2026-02-03 12:00 |
14:41:31.05 |
-18:39:51.6 |
HIP 71850 |
4.17 |
| 2026-02-04 00:00 |
14:41:31.57 |
-18:39:50.6 |
HIP 71850 |
4.05 |
| 2026-02-04 12:00 |
14:41:32.04 |
-18:39:49.5 |
HIP 71850 |
3.94 |
| 2026-02-05 00:00 |
14:41:32.46 |
-18:39:48.1 |
HIP 71850 |
3.84 |
| 2026-02-05 12:00 |
14:41:32.84 |
-18:39:46.5 |
HIP 71850 |
3.76 |
| 2026-02-06 00:00 |
14:41:33.17 |
-18:39:44.8 |
HIP 71850 |
3.68 |
| 2026-02-06 12:00 |
14:41:33.46 |
-18:39:42.8 |
HIP 71850 |
3.62 |
| 2026-02-07 00:00 |
14:41:33.70 |
-18:39:40.5 |
HIP 71850 |
3.57 |
| 2026-02-07 12:00 |
14:41:33.90 |
-18:39:38.1 |
HIP 71850 |
3.53 |
| 2026-02-08 00:00 |
14:41:34.05 |
-18:39:35.5 |
HIP 71850 |
3.51 |
| 2026-02-08 12:00 |
14:41:34.15 |
-18:39:32.6 |
HIP 71850 |
3.49 |
| 2026-02-09 00:00 |
14:41:34.21 |
-18:39:29.6 |
HIP 71850 |
3.49 |
| 2026-02-09 12:00 |
14:41:34.22 |
-18:39:26.3 |
HIP 71850 |
3.50 |
| 2026-02-10 00:00 |
14:41:34.18 |
-18:39:22.8 |
HIP 71850 |
3.52 |
| 2026-02-10 12:00 |
14:41:34.10 |
-18:39:19.1 |
HIP 71850 |
3.55 |
| 2026-02-11 00:00 |
14:41:33.98 |
-18:39:15.2 |
HIP 71850 |
3.60 |
| 2026-02-11 12:00 |
14:41:33.80 |
-18:39:11.1 |
HIP 71850 |
3.66 |
| 2026-02-12 00:00 |
14:41:33.59 |
-18:39:06.7 |
HIP 71850 |
3.73 |
| 2026-02-12 12:00 |
14:41:33.32 |
-18:39:02.2 |
HIP 71850 |
3.81 |
| 2026-02-13 00:00 |
14:41:33.01 |
-18:38:57.4 |
HIP 71850 |
3.91 |
| 2026-02-13 12:00 |
14:41:32.66 |
-18:38:52.4 |
HIP 71850 |
4.01 |
| 2026-02-14 00:00 |
14:41:32.25 |
-18:38:47.2 |
HIP 71850 |
4.13 |
| 2026-02-14 12:00 |
14:41:31.81 |
-18:38:41.8 |
HIP 71850 |
4.26 |
| 2026-02-15 00:00 |
14:41:31.31 |
-18:38:36.1 |
HIP 71850 |
4.41 |
| 2026-02-15 12:00 |
14:41:30.78 |
-18:38:30.3 |
HIP 71850 |
4.56 |
| 2026-02-16 00:00 |
14:41:30.19 |
-18:38:24.2 |
HIP 71850 |
4.73 |
| 2026-02-16 12:00 |
14:41:29.56 |
-18:38:17.9 |
HIP 71850 |
4.91 |
| 2026-02-17 00:00 |
14:41:28.89 |
-18:38:11.4 |
HIP 71850 |
5.10 |
| 2026-02-17 12:00 |
14:41:28.17 |
-18:38:04.7 |
HIP 71850 |
5.30 |
| 2026-02-18 00:00 |
14:41:27.40 |
-18:37:57.8 |
HIP 71850 |
5.51 |
| 2026-02-18 12:00 |
14:41:26.59 |
-18:37:50.6 |
HIP 71850 |
5.74 |
| 2026-02-19 00:00 |
14:41:25.74 |
-18:37:43.2 |
HIP 71850 |
5.97 |
| 2026-02-19 12:00 |
14:41:24.84 |
-18:37:35.7 |
HIP 71850 |
6.22 |
| 2026-02-20 00:00 |
14:41:23.89 |
-18:37:27.9 |
HIP 71850 |
6.48 |
| 2026-02-20 12:00 |
14:41:22.90 |
-18:37:19.8 |
HIP 71850 |
6.75 |
| 2026-02-21 00:00 |
14:41:21.86 |
-18:37:11.6 |
HIP 71850 |
7.03 |
| 2026-02-21 12:00 |
14:41:20.79 |
-18:37:03.2 |
HIP 71850 |
7.32 |
| 2026-02-22 00:00 |
14:41:19.66 |
-18:36:54.5 |
HIP 71850 |
7.62 |
| 2026-02-22 12:00 |
14:41:18.49 |
-18:36:45.6 |
HIP 71850 |
7.93 |
| 2026-02-23 00:00 |
14:41:17.28 |
-18:36:36.5 |
HIP 71850 |
8.26 |
| 2026-02-23 12:00 |
14:41:16.03 |
-18:36:27.2 |
HIP 71850 |
8.59 |
| 2026-02-24 00:00 |
14:41:14.73 |
-18:36:17.7 |
HIP 71850 |
8.94 |