C/2014 Y1 (PANSTARRS)
メタデータ
| 項目 |
値 |
| Designation |
C/2014 Y1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-01-17T15:41:20.803200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:05Z |
| Obs used |
305 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-19.0000000 |
| e |
1.00210330 |
| q (au) |
2.240976 |
| a (au) |
-1065.459229 |
| i (deg) |
14.921289 |
| Ω (om, deg) |
19.516424 |
| ω (w, deg) |
182.265969 |
| M (ma, deg) |
-0.007755 |
等級
散乱 + 全体線形
$$
M_a = (15.038 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.038 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.719 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2014-11-17 |
2015-05-15 |
+8.7937 |
-5.701 |
| 2015-05-15 |
2016-01-10 |
-0.6026 |
-0.315 |
| 2016-01-19 |
2016-05-29 |
+16.0709 |
-4.516 |
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 |
23:20:21.04 |
-12:49:20.9 |
HIP 115308 |
12.85 |
| 2026-02-03 12:00 |
23:20:25.09 |
-12:48:48.3 |
HIP 115308 |
11.90 |
| 2026-02-04 00:00 |
23:20:29.16 |
-12:48:15.6 |
HIP 115308 |
10.97 |
| 2026-02-04 12:00 |
23:20:33.26 |
-12:47:42.9 |
HIP 115308 |
10.08 |
| 2026-02-05 00:00 |
23:20:37.37 |
-12:47:10.2 |
HIP 115308 |
9.24 |
| 2026-02-05 12:00 |
23:20:41.50 |
-12:46:37.4 |
HIP 115308 |
8.47 |
| 2026-02-06 00:00 |
23:20:45.65 |
-12:46:04.5 |
HIP 115308 |
7.79 |
| 2026-02-06 12:00 |
23:20:49.83 |
-12:45:31.6 |
HIP 115308 |
7.22 |
| 2026-02-07 00:00 |
23:20:54.01 |
-12:44:58.7 |
HIP 115308 |
6.80 |
| 2026-02-07 12:00 |
23:20:58.22 |
-12:44:25.8 |
HIP 115308 |
6.56 |
| 2026-02-08 00:00 |
23:21:02.45 |
-12:43:52.8 |
HIP 115308 |
6.52 |
| 2026-02-08 12:00 |
23:21:06.69 |
-12:43:19.7 |
HIP 115308 |
6.69 |
| 2026-02-09 00:00 |
23:21:10.95 |
-12:42:46.7 |
HIP 115308 |
7.05 |
| 2026-02-09 12:00 |
23:21:15.23 |
-12:42:13.6 |
HIP 115308 |
7.57 |
| 2026-02-10 00:00 |
23:21:19.52 |
-12:41:40.5 |
HIP 115308 |
8.24 |
| 2026-02-10 12:00 |
23:21:23.83 |
-12:41:07.4 |
HIP 115308 |
9.01 |
| 2026-02-11 00:00 |
23:21:28.16 |
-12:40:34.2 |
HIP 115308 |
9.87 |
| 2026-02-11 12:00 |
23:21:32.50 |
-12:40:01.0 |
HIP 115308 |
10.79 |
| 2026-02-12 00:00 |
23:21:36.86 |
-12:39:27.9 |
HIP 115308 |
11.77 |
| 2026-02-12 12:00 |
23:21:41.23 |
-12:38:54.6 |
HIP 115351 |
12.24 |
| 2026-02-13 00:00 |
23:21:45.62 |
-12:38:21.4 |
HIP 115351 |
11.52 |
| 2026-02-13 12:00 |
23:21:50.03 |
-12:37:48.2 |
HIP 115351 |
10.88 |
| 2026-02-14 00:00 |
23:21:54.44 |
-12:37:14.9 |
HIP 115351 |
10.34 |
| 2026-02-14 12:00 |
23:21:58.88 |
-12:36:41.7 |
HIP 115351 |
9.92 |
| 2026-02-15 00:00 |
23:22:03.32 |
-12:36:08.4 |
HIP 115351 |
9.64 |
| 2026-02-15 12:00 |
23:22:07.78 |
-12:35:35.2 |
HIP 115351 |
9.51 |
| 2026-02-16 00:00 |
23:22:12.26 |
-12:35:01.9 |
HIP 115351 |
9.54 |
| 2026-02-16 12:00 |
23:22:16.75 |
-12:34:28.6 |
HIP 115351 |
9.72 |
| 2026-02-17 00:00 |
23:22:21.24 |
-12:33:55.4 |
HIP 115351 |
10.06 |
| 2026-02-17 12:00 |
23:22:25.76 |
-12:33:22.1 |
HIP 115351 |
10.53 |
| 2026-02-18 00:00 |
23:22:30.28 |
-12:32:48.9 |
HIP 115351 |
11.12 |
| 2026-02-18 12:00 |
23:22:34.82 |
-12:32:15.6 |
HIP 115351 |
11.81 |
| 2026-02-19 00:00 |
23:22:39.36 |
-12:31:42.4 |
HIP 115351 |
12.60 |
| 2026-02-19 12:00 |
23:22:43.92 |
-12:31:09.2 |
HIP 115351 |
13.45 |
| 2026-02-20 00:00 |
23:22:48.49 |
-12:30:36.0 |
HIP 115351 |
14.36 |
| 2026-02-20 12:00 |
23:22:53.07 |
-12:30:02.8 |
HIP 115351 |
15.32 |
| 2026-02-21 00:00 |
23:22:57.66 |
-12:29:29.6 |
HIP 115351 |
16.32 |
| 2026-02-21 12:00 |
23:23:02.26 |
-12:28:56.5 |
HIP 115351 |
17.36 |
| 2026-02-22 00:00 |
23:23:06.87 |
-12:28:23.4 |
HIP 115351 |
18.43 |
| 2026-02-22 12:00 |
23:23:11.49 |
-12:27:50.3 |
HIP 115351 |
19.52 |
| 2026-02-23 00:00 |
23:23:16.12 |
-12:27:17.2 |
HIP 115351 |
20.63 |
| 2026-02-23 12:00 |
23:23:20.75 |
-12:26:44.2 |
HIP 115351 |
21.76 |
| 2026-02-24 00:00 |
23:23:25.40 |
-12:26:11.2 |
HIP 115351 |
22.91 |