C/1965 S2 (Alcock)
メタデータ
| 項目 |
値 |
| Designation |
C/1965 S2 (Alcock) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1965-10-26T03:16:48.961920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:17Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1965-10-11.0000000 |
| e |
1.00034477 |
| q (au) |
1.293959 |
| a (au) |
-3753.106898 |
| i (deg) |
65.010799 |
| Ω (om, deg) |
175.619427 |
| ω (w, deg) |
150.520426 |
| M (ma, deg) |
-0.000065 |
等級
散乱 + 全体線形
$$
M_a = (9.066 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.066 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
09:24:07.91 |
-26:17:20.5 |
HIP 46115 |
2.77 |
| 2026-02-03 12:00 |
09:24:06.43 |
-26:17:16.5 |
HIP 46115 |
2.97 |
| 2026-02-04 00:00 |
09:24:04.95 |
-26:17:12.5 |
HIP 46115 |
3.18 |
| 2026-02-04 12:00 |
09:24:03.47 |
-26:17:08.3 |
HIP 46115 |
3.42 |
| 2026-02-05 00:00 |
09:24:01.98 |
-26:17:04.0 |
HIP 46115 |
3.67 |
| 2026-02-05 12:00 |
09:24:00.50 |
-26:16:59.5 |
HIP 46115 |
3.93 |
| 2026-02-06 00:00 |
09:23:59.01 |
-26:16:55.0 |
HIP 46115 |
4.21 |
| 2026-02-06 12:00 |
09:23:57.53 |
-26:16:50.3 |
HIP 46115 |
4.49 |
| 2026-02-07 00:00 |
09:23:56.04 |
-26:16:45.5 |
HIP 46115 |
4.78 |
| 2026-02-07 12:00 |
09:23:54.55 |
-26:16:40.5 |
HIP 46115 |
5.08 |
| 2026-02-08 00:00 |
09:23:53.07 |
-26:16:35.4 |
HIP 46115 |
5.38 |
| 2026-02-08 12:00 |
09:23:51.58 |
-26:16:30.2 |
HIP 46115 |
5.68 |
| 2026-02-09 00:00 |
09:23:50.09 |
-26:16:24.9 |
HIP 46115 |
5.99 |
| 2026-02-09 12:00 |
09:23:48.61 |
-26:16:19.5 |
HIP 46115 |
6.31 |
| 2026-02-10 00:00 |
09:23:47.12 |
-26:16:13.9 |
HIP 46115 |
6.62 |
| 2026-02-10 12:00 |
09:23:45.63 |
-26:16:08.2 |
HIP 46115 |
6.94 |
| 2026-02-11 00:00 |
09:23:44.15 |
-26:16:02.4 |
HIP 46115 |
7.26 |
| 2026-02-11 12:00 |
09:23:42.67 |
-26:15:56.5 |
HIP 46037 |
7.50 |
| 2026-02-12 00:00 |
09:23:41.18 |
-26:15:50.4 |
HIP 46037 |
7.22 |
| 2026-02-12 12:00 |
09:23:39.70 |
-26:15:44.3 |
HIP 46037 |
6.95 |
| 2026-02-13 00:00 |
09:23:38.22 |
-26:15:38.0 |
HIP 46037 |
6.69 |
| 2026-02-13 12:00 |
09:23:36.74 |
-26:15:31.5 |
HIP 46037 |
6.42 |
| 2026-02-14 00:00 |
09:23:35.26 |
-26:15:25.0 |
HIP 46037 |
6.17 |
| 2026-02-14 12:00 |
09:23:33.78 |
-26:15:18.3 |
HIP 46037 |
5.92 |
| 2026-02-15 00:00 |
09:23:32.31 |
-26:15:11.6 |
HIP 46037 |
5.69 |
| 2026-02-15 12:00 |
09:23:30.84 |
-26:15:04.7 |
HIP 46037 |
5.46 |
| 2026-02-16 00:00 |
09:23:29.36 |
-26:14:57.7 |
HIP 46037 |
5.25 |
| 2026-02-16 12:00 |
09:23:27.89 |
-26:14:50.5 |
HIP 46037 |
5.04 |
| 2026-02-17 00:00 |
09:23:26.43 |
-26:14:43.3 |
HIP 46037 |
4.86 |
| 2026-02-17 12:00 |
09:23:24.96 |
-26:14:35.9 |
HIP 46037 |
4.69 |
| 2026-02-18 00:00 |
09:23:23.50 |
-26:14:28.5 |
HIP 46037 |
4.54 |
| 2026-02-18 12:00 |
09:23:22.04 |
-26:14:20.9 |
HIP 46037 |
4.41 |
| 2026-02-19 00:00 |
09:23:20.58 |
-26:14:13.2 |
HIP 46037 |
4.30 |
| 2026-02-19 12:00 |
09:23:19.13 |
-26:14:05.3 |
HIP 46037 |
4.22 |
| 2026-02-20 00:00 |
09:23:17.67 |
-26:13:57.4 |
HIP 46037 |
4.17 |
| 2026-02-20 12:00 |
09:23:16.22 |
-26:13:49.4 |
HIP 46037 |
4.14 |
| 2026-02-21 00:00 |
09:23:14.78 |
-26:13:41.2 |
HIP 46037 |
4.14 |
| 2026-02-21 12:00 |
09:23:13.34 |
-26:13:32.9 |
HIP 46037 |
4.16 |
| 2026-02-22 00:00 |
09:23:11.90 |
-26:13:24.6 |
HIP 46037 |
4.22 |
| 2026-02-22 12:00 |
09:23:10.46 |
-26:13:16.1 |
HIP 46037 |
4.30 |
| 2026-02-23 00:00 |
09:23:09.03 |
-26:13:07.5 |
HIP 46037 |
4.41 |
| 2026-02-23 12:00 |
09:23:07.60 |
-26:12:58.8 |
HIP 46037 |
4.53 |
| 2026-02-24 00:00 |
09:23:06.18 |
-26:12:50.0 |
HIP 46037 |
4.68 |