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) |
| 2026-07-29 00:00 |
16:06:16.35 |
-69:07:58.1 |
HIP 78757 |
10.17 |
| 2026-07-29 12:00 |
16:06:10.12 |
-69:07:12.0 |
HIP 78757 |
9.26 |
| 2026-07-30 00:00 |
16:06:04.00 |
-69:06:25.8 |
HIP 78757 |
8.37 |
| 2026-07-30 12:00 |
16:05:58.00 |
-69:05:39.4 |
HIP 78757 |
7.50 |
| 2026-07-31 00:00 |
16:05:52.10 |
-69:04:53.0 |
HIP 78757 |
6.65 |
| 2026-07-31 12:00 |
16:05:46.32 |
-69:04:06.4 |
HIP 78757 |
5.83 |
| 2026-08-01 00:00 |
16:05:40.65 |
-69:03:19.7 |
HIP 78757 |
5.06 |
| 2026-08-01 12:00 |
16:05:35.09 |
-69:02:32.9 |
HIP 78757 |
4.37 |
| 2026-08-02 00:00 |
16:05:29.65 |
-69:01:46.0 |
HIP 78757 |
3.78 |
| 2026-08-02 12:00 |
16:05:24.31 |
-69:00:59.0 |
HIP 78757 |
3.36 |
| 2026-08-03 00:00 |
16:05:19.09 |
-69:00:11.9 |
HIP 78757 |
3.17 |
| 2026-08-03 12:00 |
16:05:13.99 |
-68:59:24.7 |
HIP 78757 |
3.24 |
| 2026-08-04 00:00 |
16:05:08.99 |
-68:58:37.4 |
HIP 78757 |
3.56 |
| 2026-08-04 12:00 |
16:05:04.11 |
-68:57:50.0 |
HIP 78757 |
4.06 |
| 2026-08-05 00:00 |
16:04:59.35 |
-68:57:02.6 |
HIP 78757 |
4.69 |
| 2026-08-05 12:00 |
16:04:54.70 |
-68:56:15.0 |
HIP 78757 |
5.40 |
| 2026-08-06 00:00 |
16:04:50.16 |
-68:55:27.5 |
HIP 78757 |
6.15 |
| 2026-08-06 12:00 |
16:04:45.73 |
-68:54:39.8 |
HIP 78757 |
6.95 |
| 2026-08-07 00:00 |
16:04:41.42 |
-68:53:52.1 |
HIP 78757 |
7.76 |
| 2026-08-07 12:00 |
16:04:37.22 |
-68:53:04.3 |
HIP 78757 |
8.58 |
| 2026-08-08 00:00 |
16:04:33.14 |
-68:52:16.5 |
HIP 78757 |
9.42 |
| 2026-08-08 12:00 |
16:04:29.17 |
-68:51:28.6 |
HIP 78757 |
10.26 |
| 2026-08-09 00:00 |
16:04:25.32 |
-68:50:40.7 |
HIP 78757 |
11.11 |
| 2026-08-09 12:00 |
16:04:21.58 |
-68:49:52.8 |
HIP 78757 |
11.96 |
| 2026-08-10 00:00 |
16:04:17.96 |
-68:49:04.8 |
HIP 78757 |
12.80 |
| 2026-08-10 12:00 |
16:04:14.45 |
-68:48:16.8 |
HIP 78757 |
13.65 |
| 2026-08-11 00:00 |
16:04:11.05 |
-68:47:28.8 |
HIP 78757 |
14.50 |
| 2026-08-11 12:00 |
16:04:07.77 |
-68:46:40.7 |
HIP 78757 |
15.35 |
| 2026-08-12 00:00 |
16:04:04.61 |
-68:45:52.7 |
HIP 78757 |
16.19 |
| 2026-08-12 12:00 |
16:04:01.56 |
-68:45:04.6 |
HIP 78757 |
17.04 |
| 2026-08-13 00:00 |
16:03:58.62 |
-68:44:16.5 |
HIP 78757 |
17.88 |
| 2026-08-13 12:00 |
16:03:55.80 |
-68:43:28.4 |
HIP 78757 |
18.72 |
| 2026-08-14 00:00 |
16:03:53.09 |
-68:42:40.4 |
HIP 78848 |
19.40 |
| 2026-08-14 12:00 |
16:03:50.50 |
-68:41:52.3 |
HIP 78848 |
18.85 |
| 2026-08-15 00:00 |
16:03:48.03 |
-68:41:04.3 |
HIP 78848 |
18.32 |
| 2026-08-15 12:00 |
16:03:45.66 |
-68:40:16.2 |
HIP 78848 |
17.81 |
| 2026-08-16 00:00 |
16:03:43.42 |
-68:39:28.2 |
HIP 78848 |
17.31 |
| 2026-08-16 12:00 |
16:03:41.28 |
-68:38:40.3 |
HIP 78848 |
16.83 |
| 2026-08-17 00:00 |
16:03:39.26 |
-68:37:52.3 |
HIP 78848 |
16.38 |
| 2026-08-17 12:00 |
16:03:37.35 |
-68:37:04.4 |
HIP 78848 |
15.95 |
| 2026-08-18 00:00 |
16:03:35.56 |
-68:36:16.6 |
HIP 78848 |
15.54 |
| 2026-08-18 12:00 |
16:03:33.88 |
-68:35:28.8 |
HIP 78848 |
15.15 |
| 2026-08-19 00:00 |
16:03:32.31 |
-68:34:41.0 |
HIP 78848 |
14.79 |