C/1959 Q2 (Alcock)
メタデータ
| 項目 |
値 |
| Designation |
C/1959 Q2 (Alcock) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1959-09-15T21:07:08.423040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
14 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1959-09-04.0000000 |
| e |
1.00043121 |
| q (au) |
0.165808 |
| a (au) |
-384.520510 |
| i (deg) |
108.035726 |
| Ω (om, deg) |
225.841022 |
| ω (w, deg) |
300.535111 |
| M (ma, deg) |
-0.001553 |
等級
散乱 + 全体線形
$$
M_a = (7.563 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.563 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
03:08:26.17 |
+81:06:26.6 |
HIP 14844 |
23.04 |
| 2026-02-03 12:00 |
03:08:25.35 |
+81:06:09.2 |
HIP 14844 |
23.32 |
| 2026-02-04 00:00 |
03:08:24.59 |
+81:05:51.7 |
HIP 13859 |
23.29 |
| 2026-02-04 12:00 |
03:08:23.91 |
+81:05:34.3 |
HIP 13859 |
23.24 |
| 2026-02-05 00:00 |
03:08:23.30 |
+81:05:16.9 |
HIP 13859 |
23.20 |
| 2026-02-05 12:00 |
03:08:22.75 |
+81:04:59.5 |
HIP 13859 |
23.17 |
| 2026-02-06 00:00 |
03:08:22.28 |
+81:04:42.1 |
HIP 13859 |
23.14 |
| 2026-02-06 12:00 |
03:08:21.88 |
+81:04:24.7 |
HIP 13859 |
23.12 |
| 2026-02-07 00:00 |
03:08:21.54 |
+81:04:07.4 |
HIP 13859 |
23.10 |
| 2026-02-07 12:00 |
03:08:21.28 |
+81:03:50.0 |
HIP 13859 |
23.09 |
| 2026-02-08 00:00 |
03:08:21.08 |
+81:03:32.7 |
HIP 13859 |
23.09 |
| 2026-02-08 12:00 |
03:08:20.95 |
+81:03:15.4 |
HIP 13859 |
23.09 |
| 2026-02-09 00:00 |
03:08:20.90 |
+81:02:58.1 |
HIP 13859 |
23.10 |
| 2026-02-09 12:00 |
03:08:20.91 |
+81:02:40.8 |
HIP 13859 |
23.12 |
| 2026-02-10 00:00 |
03:08:20.99 |
+81:02:23.6 |
HIP 13859 |
23.14 |
| 2026-02-10 12:00 |
03:08:21.14 |
+81:02:06.4 |
HIP 13859 |
23.17 |
| 2026-02-11 00:00 |
03:08:21.35 |
+81:01:49.2 |
HIP 13859 |
23.20 |
| 2026-02-11 12:00 |
03:08:21.64 |
+81:01:32.0 |
HIP 13859 |
23.24 |
| 2026-02-12 00:00 |
03:08:21.99 |
+81:01:14.9 |
HIP 13859 |
23.29 |
| 2026-02-12 12:00 |
03:08:22.42 |
+81:00:57.8 |
HIP 13859 |
23.34 |
| 2026-02-13 00:00 |
03:08:22.91 |
+81:00:40.7 |
HIP 13859 |
23.40 |
| 2026-02-13 12:00 |
03:08:23.47 |
+81:00:23.7 |
HIP 13859 |
23.47 |
| 2026-02-14 00:00 |
03:08:24.09 |
+81:00:06.7 |
HIP 13859 |
23.54 |
| 2026-02-14 12:00 |
03:08:24.79 |
+80:59:49.7 |
HIP 13859 |
23.61 |
| 2026-02-15 00:00 |
03:08:25.55 |
+80:59:32.8 |
HIP 13859 |
23.70 |
| 2026-02-15 12:00 |
03:08:26.38 |
+80:59:15.9 |
HIP 13859 |
23.78 |
| 2026-02-16 00:00 |
03:08:27.27 |
+80:58:59.0 |
HIP 13859 |
23.88 |
| 2026-02-16 12:00 |
03:08:28.24 |
+80:58:42.2 |
HIP 13859 |
23.97 |
| 2026-02-17 00:00 |
03:08:29.27 |
+80:58:25.4 |
HIP 13859 |
24.08 |
| 2026-02-17 12:00 |
03:08:30.36 |
+80:58:08.7 |
HIP 13859 |
24.19 |
| 2026-02-18 00:00 |
03:08:31.53 |
+80:57:52.0 |
HIP 13859 |
24.30 |
| 2026-02-18 12:00 |
03:08:32.76 |
+80:57:35.4 |
HIP 13859 |
24.42 |
| 2026-02-19 00:00 |
03:08:34.05 |
+80:57:18.8 |
HIP 13859 |
24.54 |
| 2026-02-19 12:00 |
03:08:35.41 |
+80:57:02.3 |
HIP 13859 |
24.67 |
| 2026-02-20 00:00 |
03:08:36.84 |
+80:56:45.8 |
HIP 13859 |
24.81 |
| 2026-02-20 12:00 |
03:08:38.33 |
+80:56:29.4 |
HIP 13859 |
24.95 |
| 2026-02-21 00:00 |
03:08:39.89 |
+80:56:13.0 |
HIP 13859 |
25.09 |
| 2026-02-21 12:00 |
03:08:41.51 |
+80:55:56.6 |
HIP 13859 |
25.24 |
| 2026-02-22 00:00 |
03:08:43.19 |
+80:55:40.4 |
HIP 13859 |
25.39 |
| 2026-02-22 12:00 |
03:08:44.94 |
+80:55:24.2 |
HIP 13859 |
25.54 |
| 2026-02-23 00:00 |
03:08:46.75 |
+80:55:08.0 |
HIP 13859 |
25.70 |
| 2026-02-23 12:00 |
03:08:48.63 |
+80:54:51.9 |
HIP 13859 |
25.87 |
| 2026-02-24 00:00 |
03:08:50.57 |
+80:54:35.8 |
HIP 13859 |
26.04 |