メタデータ
| 項目 |
値 |
| Designation |
C/1959 Q1 (Alcock) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1959-08-17T14:42:54.362880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:14Z |
| Obs used |
22 |
| 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) |
1959-09-21.0000000 |
| e |
1.00130906 |
| q (au) |
1.150410 |
| a (au) |
-878.806801 |
| i (deg) |
48.258940 |
| Ω (om, deg) |
159.919935 |
| ω (w, deg) |
124.713032 |
| M (ma, deg) |
0.001301 |
等級
散乱 + 全体線形
$$
M_a = (8.983 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.983 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1959-08-25 |
1959-11-05 |
+39.7685 |
-2.674 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
06:35:45.27 |
-20:43:58.1 |
HIP 31382 |
17.44 |
| 2026-09-20 12:00 |
06:35:45.53 |
-20:44:11.2 |
HIP 31382 |
17.62 |
| 2026-09-21 00:00 |
06:35:45.79 |
-20:44:24.3 |
HIP 31382 |
17.80 |
| 2026-09-21 12:00 |
06:35:46.03 |
-20:44:37.4 |
HIP 31382 |
17.98 |
| 2026-09-22 00:00 |
06:35:46.26 |
-20:44:50.5 |
HIP 31382 |
18.16 |
| 2026-09-22 12:00 |
06:35:46.47 |
-20:45:03.6 |
HIP 31382 |
18.33 |
| 2026-09-23 00:00 |
06:35:46.68 |
-20:45:16.8 |
HIP 31382 |
18.51 |
| 2026-09-23 12:00 |
06:35:46.87 |
-20:45:29.9 |
HIP 31382 |
18.69 |
| 2026-09-24 00:00 |
06:35:47.06 |
-20:45:43.1 |
HIP 31382 |
18.86 |
| 2026-09-24 12:00 |
06:35:47.23 |
-20:45:56.2 |
HIP 31382 |
19.04 |
| 2026-09-25 00:00 |
06:35:47.39 |
-20:46:09.4 |
HIP 31382 |
19.21 |
| 2026-09-25 12:00 |
06:35:47.54 |
-20:46:22.6 |
HIP 31382 |
19.38 |
| 2026-09-26 00:00 |
06:35:47.67 |
-20:46:35.8 |
HIP 31382 |
19.55 |
| 2026-09-26 12:00 |
06:35:47.80 |
-20:46:49.0 |
HIP 31382 |
19.72 |
| 2026-09-27 00:00 |
06:35:47.91 |
-20:47:02.2 |
HIP 31382 |
19.89 |
| 2026-09-27 12:00 |
06:35:48.02 |
-20:47:15.4 |
HIP 31382 |
20.06 |
| 2026-09-28 00:00 |
06:35:48.11 |
-20:47:28.6 |
HIP 31382 |
20.23 |
| 2026-09-28 12:00 |
06:35:48.19 |
-20:47:41.8 |
HIP 31382 |
20.39 |
| 2026-09-29 00:00 |
06:35:48.25 |
-20:47:55.0 |
HIP 31382 |
20.56 |
| 2026-09-29 12:00 |
06:35:48.31 |
-20:48:08.2 |
HIP 31382 |
20.72 |
| 2026-09-30 00:00 |
06:35:48.36 |
-20:48:21.4 |
HIP 31382 |
20.89 |
| 2026-09-30 12:00 |
06:35:48.39 |
-20:48:34.6 |
HIP 31382 |
21.05 |
| 2026-10-01 00:00 |
06:35:48.41 |
-20:48:47.8 |
HIP 31382 |
21.21 |
| 2026-10-01 12:00 |
06:35:48.42 |
-20:49:01.0 |
HIP 31382 |
21.37 |
| 2026-10-02 00:00 |
06:35:48.42 |
-20:49:14.2 |
HIP 31382 |
21.53 |
| 2026-10-02 12:00 |
06:35:48.40 |
-20:49:27.4 |
HIP 31382 |
21.69 |
| 2026-10-03 00:00 |
06:35:48.38 |
-20:49:40.6 |
HIP 31382 |
21.85 |
| 2026-10-03 12:00 |
06:35:48.34 |
-20:49:53.8 |
HIP 31382 |
22.01 |
| 2026-10-04 00:00 |
06:35:48.29 |
-20:50:06.9 |
HIP 31382 |
22.16 |
| 2026-10-04 12:00 |
06:35:48.23 |
-20:50:20.1 |
HIP 31382 |
22.32 |
| 2026-10-05 00:00 |
06:35:48.16 |
-20:50:33.2 |
HIP 31382 |
22.48 |
| 2026-10-05 12:00 |
06:35:48.08 |
-20:50:46.3 |
HIP 31382 |
22.63 |
| 2026-10-06 00:00 |
06:35:47.98 |
-20:50:59.5 |
HIP 31382 |
22.78 |
| 2026-10-06 12:00 |
06:35:47.87 |
-20:51:12.6 |
HIP 31382 |
22.94 |
| 2026-10-07 00:00 |
06:35:47.75 |
-20:51:25.7 |
HIP 31382 |
23.09 |
| 2026-10-07 12:00 |
06:35:47.62 |
-20:51:38.7 |
HIP 31382 |
23.24 |
| 2026-10-08 00:00 |
06:35:47.48 |
-20:51:51.8 |
HIP 31382 |
23.39 |
| 2026-10-08 12:00 |
06:35:47.32 |
-20:52:04.8 |
HIP 31382 |
23.54 |
| 2026-10-09 00:00 |
06:35:47.16 |
-20:52:17.9 |
HIP 31382 |
23.69 |
| 2026-10-09 12:00 |
06:35:46.98 |
-20:52:30.9 |
HIP 31382 |
23.83 |
| 2026-10-10 00:00 |
06:35:46.79 |
-20:52:43.8 |
HIP 31382 |
23.98 |
| 2026-10-10 12:00 |
06:35:46.59 |
-20:52:56.8 |
HIP 31382 |
24.13 |
| 2026-10-11 00:00 |
06:35:46.37 |
-20:53:09.7 |
HIP 31382 |
24.27 |