メタデータ
| 項目 |
値 |
| Designation |
C/2014 S3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-13T07:42:24.215040Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
48 |
| NEO |
- |
| M1 |
17.500 |
| K1 |
8.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-08.0000000 |
| e |
0.97675738 |
| q (au) |
2.049265 |
| a (au) |
88.168442 |
| i (deg) |
169.320625 |
| Ω (om, deg) |
356.051072 |
| ω (w, deg) |
293.142060 |
| M (ma, deg) |
0.066286 |
等級
散乱 + 全体線形
$$
M_a = (16.882 + 3.181\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
16.882 |
| n |
3.181 |
| gf |
0.994 |
| gb |
-0.558 |
| k |
0.999 |
| δ90 |
9.962 |
| 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 |
18:18:49.39 |
-12:27:32.8 |
HIP 89681 |
16.78 |
| 2026-05-12 12:00 |
18:18:45.59 |
-12:27:25.4 |
HIP 89681 |
16.11 |
| 2026-05-13 00:00 |
18:18:41.76 |
-12:27:18.2 |
HIP 89681 |
15.47 |
| 2026-05-13 12:00 |
18:18:37.90 |
-12:27:11.0 |
HIP 89681 |
14.85 |
| 2026-05-14 00:00 |
18:18:34.01 |
-12:27:03.9 |
HIP 89681 |
14.27 |
| 2026-05-14 12:00 |
18:18:30.10 |
-12:26:56.9 |
HIP 89681 |
13.73 |
| 2026-05-15 00:00 |
18:18:26.16 |
-12:26:50.0 |
HIP 89681 |
13.24 |
| 2026-05-15 12:00 |
18:18:22.19 |
-12:26:43.2 |
HIP 89681 |
12.80 |
| 2026-05-16 00:00 |
18:18:18.19 |
-12:26:36.5 |
HIP 89681 |
12.42 |
| 2026-05-16 12:00 |
18:18:14.17 |
-12:26:29.9 |
HIP 89681 |
12.11 |
| 2026-05-17 00:00 |
18:18:10.12 |
-12:26:23.3 |
HIP 89681 |
11.88 |
| 2026-05-17 12:00 |
18:18:06.05 |
-12:26:16.9 |
HIP 89653 |
11.44 |
| 2026-05-18 00:00 |
18:18:01.95 |
-12:26:10.6 |
HIP 89653 |
10.98 |
| 2026-05-18 12:00 |
18:17:57.82 |
-12:26:04.3 |
HIP 89653 |
10.58 |
| 2026-05-19 00:00 |
18:17:53.67 |
-12:25:58.2 |
HIP 89653 |
10.28 |
| 2026-05-19 12:00 |
18:17:49.49 |
-12:25:52.1 |
HIP 89653 |
10.06 |
| 2026-05-20 00:00 |
18:17:45.29 |
-12:25:46.2 |
HIP 89653 |
9.96 |
| 2026-05-20 12:00 |
18:17:41.07 |
-12:25:40.3 |
HIP 89653 |
9.96 |
| 2026-05-21 00:00 |
18:17:36.82 |
-12:25:34.6 |
HIP 89653 |
10.07 |
| 2026-05-21 12:00 |
18:17:32.55 |
-12:25:28.9 |
HIP 89653 |
10.29 |
| 2026-05-22 00:00 |
18:17:28.25 |
-12:25:23.3 |
HIP 89653 |
10.61 |
| 2026-05-22 12:00 |
18:17:23.93 |
-12:25:17.9 |
HIP 89653 |
11.03 |
| 2026-05-23 00:00 |
18:17:19.59 |
-12:25:12.5 |
HIP 89653 |
11.53 |
| 2026-05-23 12:00 |
18:17:15.23 |
-12:25:07.2 |
HIP 89653 |
12.12 |
| 2026-05-24 00:00 |
18:17:10.85 |
-12:25:02.1 |
HIP 89653 |
12.77 |
| 2026-05-24 12:00 |
18:17:06.44 |
-12:24:57.0 |
HIP 89653 |
13.48 |
| 2026-05-25 00:00 |
18:17:02.01 |
-12:24:52.0 |
HIP 89653 |
14.24 |
| 2026-05-25 12:00 |
18:16:57.56 |
-12:24:47.1 |
HIP 89653 |
15.05 |
| 2026-05-26 00:00 |
18:16:53.10 |
-12:24:42.4 |
HIP 89653 |
15.89 |
| 2026-05-26 12:00 |
18:16:48.61 |
-12:24:37.7 |
HIP 89653 |
16.77 |
| 2026-05-27 00:00 |
18:16:44.10 |
-12:24:33.1 |
HIP 89653 |
17.68 |
| 2026-05-27 12:00 |
18:16:39.57 |
-12:24:28.6 |
HIP 89653 |
18.61 |
| 2026-05-28 00:00 |
18:16:35.02 |
-12:24:24.3 |
HIP 89653 |
19.57 |
| 2026-05-28 12:00 |
18:16:30.46 |
-12:24:20.0 |
HIP 89436 |
20.02 |
| 2026-05-29 00:00 |
18:16:25.87 |
-12:24:15.8 |
HIP 89436 |
18.97 |
| 2026-05-29 12:00 |
18:16:21.27 |
-12:24:11.8 |
HIP 89436 |
17.92 |
| 2026-05-30 00:00 |
18:16:16.65 |
-12:24:07.8 |
HIP 89436 |
16.88 |
| 2026-05-30 12:00 |
18:16:12.01 |
-12:24:03.9 |
HIP 89436 |
15.85 |
| 2026-05-31 00:00 |
18:16:07.35 |
-12:24:00.2 |
HIP 89436 |
14.83 |
| 2026-05-31 12:00 |
18:16:02.68 |
-12:23:56.5 |
HIP 89436 |
13.83 |
| 2026-06-01 00:00 |
18:15:57.99 |
-12:23:52.9 |
HIP 89436 |
12.84 |
| 2026-06-01 12:00 |
18:15:53.28 |
-12:23:49.5 |
HIP 89436 |
11.88 |
| 2026-06-02 00:00 |
18:15:48.56 |
-12:23:46.1 |
HIP 89436 |
10.94 |