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) |
| 2026-05-12 00:00 |
09:21:06.20 |
-25:38:42.7 |
HIP 45793 |
11.82 |
| 2026-05-12 12:00 |
09:21:06.29 |
-25:38:29.1 |
HIP 45793 |
11.82 |
| 2026-05-13 00:00 |
09:21:06.40 |
-25:38:15.5 |
HIP 45793 |
11.83 |
| 2026-05-13 12:00 |
09:21:06.51 |
-25:38:02.1 |
HIP 45793 |
11.85 |
| 2026-05-14 00:00 |
09:21:06.64 |
-25:37:48.6 |
HIP 45793 |
11.87 |
| 2026-05-14 12:00 |
09:21:06.79 |
-25:37:35.2 |
HIP 45793 |
11.90 |
| 2026-05-15 00:00 |
09:21:06.94 |
-25:37:21.9 |
HIP 45793 |
11.94 |
| 2026-05-15 12:00 |
09:21:07.11 |
-25:37:08.6 |
HIP 45793 |
11.99 |
| 2026-05-16 00:00 |
09:21:07.29 |
-25:36:55.4 |
HIP 45793 |
12.04 |
| 2026-05-16 12:00 |
09:21:07.48 |
-25:36:42.2 |
HIP 45793 |
12.10 |
| 2026-05-17 00:00 |
09:21:07.68 |
-25:36:29.1 |
HIP 45793 |
12.16 |
| 2026-05-17 12:00 |
09:21:07.90 |
-25:36:16.1 |
HIP 45793 |
12.23 |
| 2026-05-18 00:00 |
09:21:08.12 |
-25:36:03.1 |
HIP 45793 |
12.31 |
| 2026-05-18 12:00 |
09:21:08.37 |
-25:35:50.2 |
HIP 45793 |
12.40 |
| 2026-05-19 00:00 |
09:21:08.62 |
-25:35:37.3 |
HIP 45793 |
12.49 |
| 2026-05-19 12:00 |
09:21:08.88 |
-25:35:24.5 |
HIP 45793 |
12.58 |
| 2026-05-20 00:00 |
09:21:09.16 |
-25:35:11.8 |
HIP 45793 |
12.68 |
| 2026-05-20 12:00 |
09:21:09.45 |
-25:34:59.1 |
HIP 45793 |
12.79 |
| 2026-05-21 00:00 |
09:21:09.75 |
-25:34:46.5 |
HIP 45793 |
12.90 |
| 2026-05-21 12:00 |
09:21:10.06 |
-25:34:34.0 |
HIP 45793 |
13.02 |
| 2026-05-22 00:00 |
09:21:10.39 |
-25:34:21.5 |
HIP 45793 |
13.14 |
| 2026-05-22 12:00 |
09:21:10.72 |
-25:34:09.1 |
HIP 45793 |
13.27 |
| 2026-05-23 00:00 |
09:21:11.07 |
-25:33:56.7 |
HIP 45793 |
13.40 |
| 2026-05-23 12:00 |
09:21:11.43 |
-25:33:44.5 |
HIP 45793 |
13.54 |
| 2026-05-24 00:00 |
09:21:11.81 |
-25:33:32.3 |
HIP 45793 |
13.68 |
| 2026-05-24 12:00 |
09:21:12.19 |
-25:33:20.1 |
HIP 45793 |
13.82 |
| 2026-05-25 00:00 |
09:21:12.59 |
-25:33:08.1 |
HIP 45793 |
13.97 |
| 2026-05-25 12:00 |
09:21:12.99 |
-25:32:56.1 |
HIP 45793 |
14.12 |
| 2026-05-26 00:00 |
09:21:13.41 |
-25:32:44.2 |
HIP 45793 |
14.28 |
| 2026-05-26 12:00 |
09:21:13.84 |
-25:32:32.3 |
HIP 45793 |
14.44 |
| 2026-05-27 00:00 |
09:21:14.29 |
-25:32:20.6 |
HIP 45793 |
14.60 |
| 2026-05-27 12:00 |
09:21:14.74 |
-25:32:08.9 |
HIP 45793 |
14.77 |
| 2026-05-28 00:00 |
09:21:15.21 |
-25:31:57.3 |
HIP 45793 |
14.94 |
| 2026-05-28 12:00 |
09:21:15.68 |
-25:31:45.7 |
HIP 45793 |
15.12 |
| 2026-05-29 00:00 |
09:21:16.17 |
-25:31:34.3 |
HIP 45793 |
15.29 |
| 2026-05-29 12:00 |
09:21:16.67 |
-25:31:22.9 |
HIP 45793 |
15.47 |
| 2026-05-30 00:00 |
09:21:17.18 |
-25:31:11.6 |
HIP 45793 |
15.66 |
| 2026-05-30 12:00 |
09:21:17.71 |
-25:31:00.4 |
HIP 45793 |
15.84 |
| 2026-05-31 00:00 |
09:21:18.24 |
-25:30:49.2 |
HIP 45793 |
16.03 |
| 2026-05-31 12:00 |
09:21:18.79 |
-25:30:38.2 |
HIP 45793 |
16.22 |
| 2026-06-01 00:00 |
09:21:19.34 |
-25:30:27.2 |
HIP 45793 |
16.41 |
| 2026-06-01 12:00 |
09:21:19.91 |
-25:30:16.3 |
HIP 45793 |
16.61 |
| 2026-06-02 00:00 |
09:21:20.49 |
-25:30:05.5 |
HIP 45793 |
16.80 |