C/2014 W2 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2014 W2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-03-10T11:35:51.728640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
3410 |
| NEO |
- |
| M1 |
8.100 |
| K1 |
8.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-02-17.0000000 |
| e |
0.99831735 |
| q (au) |
2.670189 |
| a (au) |
1586.896022 |
| i (deg) |
81.998562 |
| Ω (om, deg) |
69.962778 |
| ω (w, deg) |
85.009454 |
| M (ma, deg) |
359.999649 |
等級
散乱 + 全体線形
$$
M_a = (8.719 + 2.968\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.719 |
| n |
2.968 |
| gf |
1.000 |
| gb |
-0.730 |
| k |
0.994 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2014-10-24 |
2015-09-28 |
+2.5743 |
-1.749 |
| 2015-09-28 |
2016-03-10 |
+6.8475 |
-3.627 |
| 2016-03-10 |
2016-10-09 |
+7.6354 |
-3.819 |
| 2016-10-09 |
2017-09-11 |
-0.5717 |
+0.375 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:51:02.64 |
-67:10:12.4 |
HIP 82394 |
10.09 |
| 2026-02-03 12:00 |
16:51:09.14 |
-67:11:08.9 |
HIP 82417 |
10.51 |
| 2026-02-04 00:00 |
16:51:15.56 |
-67:12:05.5 |
HIP 82417 |
9.87 |
| 2026-02-04 12:00 |
16:51:21.89 |
-67:13:02.3 |
HIP 82417 |
9.31 |
| 2026-02-05 00:00 |
16:51:28.13 |
-67:13:59.3 |
HIP 82417 |
8.85 |
| 2026-02-05 12:00 |
16:51:34.28 |
-67:14:56.4 |
HIP 82417 |
8.51 |
| 2026-02-06 00:00 |
16:51:40.34 |
-67:15:53.7 |
HIP 82417 |
8.29 |
| 2026-02-06 12:00 |
16:51:46.31 |
-67:16:51.2 |
HIP 82417 |
8.22 |
| 2026-02-07 00:00 |
16:51:52.19 |
-67:17:48.9 |
HIP 82417 |
8.28 |
| 2026-02-07 12:00 |
16:51:57.98 |
-67:18:46.7 |
HIP 82417 |
8.49 |
| 2026-02-08 00:00 |
16:52:03.67 |
-67:19:44.7 |
HIP 82417 |
8.82 |
| 2026-02-08 12:00 |
16:52:09.28 |
-67:20:42.8 |
HIP 82417 |
9.26 |
| 2026-02-09 00:00 |
16:52:14.79 |
-67:21:41.0 |
HIP 82417 |
9.80 |
| 2026-02-09 12:00 |
16:52:20.20 |
-67:22:39.5 |
HIP 82417 |
10.42 |
| 2026-02-10 00:00 |
16:52:25.52 |
-67:23:38.0 |
HIP 82417 |
11.11 |
| 2026-02-10 12:00 |
16:52:30.75 |
-67:24:36.7 |
HIP 82488 |
10.60 |
| 2026-02-11 00:00 |
16:52:35.88 |
-67:25:35.6 |
HIP 82488 |
10.06 |
| 2026-02-11 12:00 |
16:52:40.91 |
-67:26:34.6 |
HIP 82488 |
9.61 |
| 2026-02-12 00:00 |
16:52:45.85 |
-67:27:33.7 |
HIP 82488 |
9.25 |
| 2026-02-12 12:00 |
16:52:50.69 |
-67:28:32.9 |
HIP 82488 |
9.01 |
| 2026-02-13 00:00 |
16:52:55.43 |
-67:29:32.3 |
HIP 82488 |
8.89 |
| 2026-02-13 12:00 |
16:53:00.07 |
-67:30:31.8 |
HIP 82488 |
8.88 |
| 2026-02-14 00:00 |
16:53:04.61 |
-67:31:31.4 |
HIP 82488 |
9.00 |
| 2026-02-14 12:00 |
16:53:09.05 |
-67:32:31.1 |
HIP 82488 |
9.23 |
| 2026-02-15 00:00 |
16:53:13.39 |
-67:33:31.0 |
HIP 82539 |
9.08 |
| 2026-02-15 12:00 |
16:53:17.63 |
-67:34:30.9 |
HIP 82539 |
8.55 |
| 2026-02-16 00:00 |
16:53:21.77 |
-67:35:31.0 |
HIP 82539 |
8.12 |
| 2026-02-16 12:00 |
16:53:25.80 |
-67:36:31.1 |
HIP 82539 |
7.81 |
| 2026-02-17 00:00 |
16:53:29.74 |
-67:37:31.4 |
HIP 82539 |
7.62 |
| 2026-02-17 12:00 |
16:53:33.56 |
-67:38:31.7 |
HIP 82539 |
7.58 |
| 2026-02-18 00:00 |
16:53:37.29 |
-67:39:32.2 |
HIP 82539 |
7.67 |
| 2026-02-18 12:00 |
16:53:40.91 |
-67:40:32.7 |
HIP 82539 |
7.90 |
| 2026-02-19 00:00 |
16:53:44.42 |
-67:41:33.3 |
HIP 82539 |
8.25 |
| 2026-02-19 12:00 |
16:53:47.83 |
-67:42:34.0 |
HIP 82539 |
8.71 |
| 2026-02-20 00:00 |
16:53:51.13 |
-67:43:34.8 |
HIP 82539 |
9.25 |
| 2026-02-20 12:00 |
16:53:54.33 |
-67:44:35.7 |
HIP 82539 |
9.87 |
| 2026-02-21 00:00 |
16:53:57.42 |
-67:45:36.6 |
HIP 82539 |
10.56 |
| 2026-02-21 12:00 |
16:54:00.40 |
-67:46:37.6 |
HIP 82539 |
11.29 |
| 2026-02-22 00:00 |
16:54:03.27 |
-67:47:38.6 |
HIP 82539 |
12.06 |
| 2026-02-22 12:00 |
16:54:06.04 |
-67:48:39.7 |
HIP 82539 |
12.86 |
| 2026-02-23 00:00 |
16:54:08.69 |
-67:49:40.8 |
HIP 82539 |
13.69 |
| 2026-02-23 12:00 |
16:54:11.24 |
-67:50:42.0 |
HIP 82539 |
14.54 |
| 2026-02-24 00:00 |
16:54:13.68 |
-67:51:43.3 |
HIP 82539 |
15.41 |