メタデータ
| 項目 |
値 |
| Designation |
C/2013 Y2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-13T15:29:33.463680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
436 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
15.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-03-11.0000000 |
| e |
0.99127402 |
| q (au) |
1.919085 |
| a (au) |
219.927835 |
| i (deg) |
29.414744 |
| Ω (om, deg) |
243.400925 |
| ω (w, deg) |
308.841643 |
| M (ma, deg) |
359.971399 |
等級
散乱 + 全体線形
$$
M_a = (10.343 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.343 |
| n |
6.000 |
| gf |
0.855 |
| gb |
-0.679 |
| k |
0.919 |
| 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) |
| 2026-07-29 00:00 |
22:18:41.26 |
+21:41:24.4 |
HIP 110274 |
22.52 |
| 2026-07-29 12:00 |
22:18:37.65 |
+21:41:23.3 |
HIP 110274 |
23.32 |
| 2026-07-30 00:00 |
22:18:34.03 |
+21:41:21.9 |
HIP 110218 |
23.88 |
| 2026-07-30 12:00 |
22:18:30.39 |
+21:41:20.1 |
HIP 110218 |
24.36 |
| 2026-07-31 00:00 |
22:18:26.73 |
+21:41:18.0 |
HIP 110040 |
24.78 |
| 2026-07-31 12:00 |
22:18:23.06 |
+21:41:15.5 |
HIP 110040 |
24.29 |
| 2026-08-01 00:00 |
22:18:19.37 |
+21:41:12.7 |
HIP 110040 |
23.83 |
| 2026-08-01 12:00 |
22:18:15.66 |
+21:41:09.6 |
HIP 110040 |
23.38 |
| 2026-08-02 00:00 |
22:18:11.94 |
+21:41:06.1 |
HIP 110040 |
22.97 |
| 2026-08-02 12:00 |
22:18:08.21 |
+21:41:02.3 |
HIP 110040 |
22.58 |
| 2026-08-03 00:00 |
22:18:04.46 |
+21:40:58.1 |
HIP 110040 |
22.23 |
| 2026-08-03 12:00 |
22:18:00.70 |
+21:40:53.6 |
HIP 110040 |
21.90 |
| 2026-08-04 00:00 |
22:17:56.92 |
+21:40:48.7 |
HIP 110040 |
21.62 |
| 2026-08-04 12:00 |
22:17:53.12 |
+21:40:43.5 |
HIP 110040 |
21.36 |
| 2026-08-05 00:00 |
22:17:49.32 |
+21:40:38.0 |
HIP 110040 |
21.15 |
| 2026-08-05 12:00 |
22:17:45.50 |
+21:40:32.1 |
HIP 110040 |
20.98 |
| 2026-08-06 00:00 |
22:17:41.66 |
+21:40:25.9 |
HIP 110040 |
20.85 |
| 2026-08-06 12:00 |
22:17:37.82 |
+21:40:19.3 |
HIP 110040 |
20.76 |
| 2026-08-07 00:00 |
22:17:33.96 |
+21:40:12.4 |
HIP 110040 |
20.71 |
| 2026-08-07 12:00 |
22:17:30.09 |
+21:40:05.2 |
HIP 110040 |
20.71 |
| 2026-08-08 00:00 |
22:17:26.20 |
+21:39:57.6 |
HIP 110040 |
20.76 |
| 2026-08-08 12:00 |
22:17:22.31 |
+21:39:49.6 |
HIP 110040 |
20.85 |
| 2026-08-09 00:00 |
22:17:18.40 |
+21:39:41.4 |
HIP 110040 |
20.98 |
| 2026-08-09 12:00 |
22:17:14.49 |
+21:39:32.8 |
HIP 110040 |
21.16 |
| 2026-08-10 00:00 |
22:17:10.56 |
+21:39:23.8 |
HIP 110040 |
21.39 |
| 2026-08-10 12:00 |
22:17:06.62 |
+21:39:14.5 |
HIP 110040 |
21.66 |
| 2026-08-11 00:00 |
22:17:02.68 |
+21:39:04.9 |
HIP 110040 |
21.97 |
| 2026-08-11 12:00 |
22:16:58.72 |
+21:38:54.9 |
HIP 110040 |
22.31 |
| 2026-08-12 00:00 |
22:16:54.75 |
+21:38:44.6 |
HIP 110040 |
22.70 |
| 2026-08-12 12:00 |
22:16:50.78 |
+21:38:34.0 |
HIP 110040 |
23.13 |
| 2026-08-13 00:00 |
22:16:46.80 |
+21:38:23.0 |
HIP 110040 |
23.59 |
| 2026-08-13 12:00 |
22:16:42.81 |
+21:38:11.7 |
HIP 110040 |
24.09 |
| 2026-08-14 00:00 |
22:16:38.81 |
+21:38:00.0 |
HIP 110040 |
24.61 |
| 2026-08-14 12:00 |
22:16:34.80 |
+21:37:48.0 |
HIP 110040 |
25.17 |
| 2026-08-15 00:00 |
22:16:30.79 |
+21:37:35.7 |
HIP 110040 |
25.76 |
| 2026-08-15 12:00 |
22:16:26.77 |
+21:37:23.1 |
HIP 110040 |
26.37 |
| 2026-08-16 00:00 |
22:16:22.74 |
+21:37:10.1 |
HIP 110040 |
27.01 |
| 2026-08-16 12:00 |
22:16:18.71 |
+21:36:56.8 |
HIP 109858 |
27.03 |
| 2026-08-17 00:00 |
22:16:14.67 |
+21:36:43.2 |
HIP 109858 |
26.25 |
| 2026-08-17 12:00 |
22:16:10.63 |
+21:36:29.2 |
HIP 109858 |
25.47 |
| 2026-08-18 00:00 |
22:16:06.59 |
+21:36:14.9 |
HIP 109858 |
24.70 |
| 2026-08-18 12:00 |
22:16:02.53 |
+21:36:00.3 |
HIP 109858 |
23.93 |
| 2026-08-19 00:00 |
22:15:58.48 |
+21:35:45.4 |
HIP 109858 |
23.18 |