メタデータ
| 項目 |
値 |
| Designation |
C/2014 W9 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-15T16:56:21.163200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
13.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-01-29.0000000 |
| e |
0.85784434 |
| q (au) |
1.587455 |
| a (au) |
11.167021 |
| i (deg) |
10.630531 |
| Ω (om, deg) |
21.288616 |
| ω (w, deg) |
167.769440 |
| M (ma, deg) |
359.532358 |
等級
散乱 + 全体線形
$$
M_a = (14.130 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.130 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.833 |
| k |
0.986 |
| δ90 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
00:08:04.91 |
-03:36:37.2 |
HIP 569 |
17.73 |
| 2026-05-12 12:00 |
00:08:09.12 |
-03:36:13.8 |
HIP 569 |
18.80 |
| 2026-05-13 00:00 |
00:08:13.30 |
-03:35:50.5 |
HIP 569 |
19.87 |
| 2026-05-13 12:00 |
00:08:17.44 |
-03:35:27.6 |
HIP 569 |
20.93 |
| 2026-05-14 00:00 |
00:08:21.55 |
-03:35:04.9 |
HIP 788 |
21.26 |
| 2026-05-14 12:00 |
00:08:25.62 |
-03:34:42.4 |
HIP 788 |
20.39 |
| 2026-05-15 00:00 |
00:08:29.66 |
-03:34:20.3 |
HIP 788 |
19.54 |
| 2026-05-15 12:00 |
00:08:33.66 |
-03:33:58.4 |
HIP 788 |
18.73 |
| 2026-05-16 00:00 |
00:08:37.63 |
-03:33:36.8 |
HIP 788 |
17.95 |
| 2026-05-16 12:00 |
00:08:41.56 |
-03:33:15.4 |
HIP 788 |
17.20 |
| 2026-05-17 00:00 |
00:08:45.46 |
-03:32:54.3 |
HIP 788 |
16.50 |
| 2026-05-17 12:00 |
00:08:49.32 |
-03:32:33.5 |
HIP 788 |
15.83 |
| 2026-05-18 00:00 |
00:08:53.14 |
-03:32:13.0 |
HIP 788 |
15.21 |
| 2026-05-18 12:00 |
00:08:56.93 |
-03:31:52.7 |
HIP 788 |
14.64 |
| 2026-05-19 00:00 |
00:09:00.68 |
-03:31:32.7 |
HIP 788 |
14.12 |
| 2026-05-19 12:00 |
00:09:04.39 |
-03:31:13.0 |
HIP 788 |
13.65 |
| 2026-05-20 00:00 |
00:09:08.06 |
-03:30:53.6 |
HIP 788 |
13.25 |
| 2026-05-20 12:00 |
00:09:11.70 |
-03:30:34.5 |
HIP 788 |
12.91 |
| 2026-05-21 00:00 |
00:09:15.30 |
-03:30:15.6 |
HIP 788 |
12.63 |
| 2026-05-21 12:00 |
00:09:18.86 |
-03:29:57.0 |
HIP 788 |
12.42 |
| 2026-05-22 00:00 |
00:09:22.38 |
-03:29:38.7 |
HIP 788 |
12.28 |
| 2026-05-22 12:00 |
00:09:25.86 |
-03:29:20.7 |
HIP 788 |
12.21 |
| 2026-05-23 00:00 |
00:09:29.31 |
-03:29:03.0 |
HIP 788 |
12.20 |
| 2026-05-23 12:00 |
00:09:32.71 |
-03:28:45.5 |
HIP 788 |
12.26 |
| 2026-05-24 00:00 |
00:09:36.08 |
-03:28:28.4 |
HIP 788 |
12.39 |
| 2026-05-24 12:00 |
00:09:39.40 |
-03:28:11.5 |
HIP 788 |
12.57 |
| 2026-05-25 00:00 |
00:09:42.69 |
-03:27:54.9 |
HIP 788 |
12.80 |
| 2026-05-25 12:00 |
00:09:45.94 |
-03:27:38.6 |
HIP 788 |
13.08 |
| 2026-05-26 00:00 |
00:09:49.14 |
-03:27:22.6 |
HIP 788 |
13.40 |
| 2026-05-26 12:00 |
00:09:52.31 |
-03:27:06.9 |
HIP 788 |
13.76 |
| 2026-05-27 00:00 |
00:09:55.44 |
-03:26:51.5 |
HIP 788 |
14.16 |
| 2026-05-27 12:00 |
00:09:58.52 |
-03:26:36.4 |
HIP 788 |
14.58 |
| 2026-05-28 00:00 |
00:10:01.57 |
-03:26:21.6 |
HIP 788 |
15.03 |
| 2026-05-28 12:00 |
00:10:04.57 |
-03:26:07.0 |
HIP 788 |
15.49 |
| 2026-05-29 00:00 |
00:10:07.54 |
-03:25:52.8 |
HIP 788 |
15.98 |
| 2026-05-29 12:00 |
00:10:10.46 |
-03:25:38.8 |
HIP 906 |
16.08 |
| 2026-05-30 00:00 |
00:10:13.34 |
-03:25:25.2 |
HIP 906 |
15.33 |
| 2026-05-30 12:00 |
00:10:16.18 |
-03:25:11.8 |
HIP 906 |
14.59 |
| 2026-05-31 00:00 |
00:10:18.98 |
-03:24:58.8 |
HIP 906 |
13.87 |
| 2026-05-31 12:00 |
00:10:21.73 |
-03:24:46.0 |
HIP 906 |
13.15 |
| 2026-06-01 00:00 |
00:10:24.44 |
-03:24:33.5 |
HIP 906 |
12.45 |
| 2026-06-01 12:00 |
00:10:27.12 |
-03:24:21.4 |
HIP 906 |
11.76 |
| 2026-06-02 00:00 |
00:10:29.74 |
-03:24:09.5 |
HIP 906 |
11.08 |