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) |
| 2026-03-26 00:00 |
03:12:30.72 |
+80:40:58.9 |
HIP 15463 |
27.00 |
| 2026-03-26 12:00 |
03:12:35.90 |
+80:40:48.3 |
HIP 15463 |
26.73 |
| 2026-03-27 00:00 |
03:12:41.13 |
+80:40:37.8 |
HIP 15463 |
26.46 |
| 2026-03-27 12:00 |
03:12:46.40 |
+80:40:27.4 |
HIP 15463 |
26.19 |
| 2026-03-28 00:00 |
03:12:51.71 |
+80:40:17.1 |
HIP 15463 |
25.92 |
| 2026-03-28 12:00 |
03:12:57.06 |
+80:40:06.9 |
HIP 15463 |
25.65 |
| 2026-03-29 00:00 |
03:13:02.45 |
+80:39:56.9 |
HIP 15463 |
25.39 |
| 2026-03-29 12:00 |
03:13:07.88 |
+80:39:46.9 |
HIP 15463 |
25.12 |
| 2026-03-30 00:00 |
03:13:13.35 |
+80:39:37.1 |
HIP 15463 |
24.85 |
| 2026-03-30 12:00 |
03:13:18.85 |
+80:39:27.4 |
HIP 15463 |
24.59 |
| 2026-03-31 00:00 |
03:13:24.40 |
+80:39:17.8 |
HIP 15463 |
24.32 |
| 2026-03-31 12:00 |
03:13:29.98 |
+80:39:08.3 |
HIP 15463 |
24.06 |
| 2026-04-01 00:00 |
03:13:35.60 |
+80:38:58.9 |
HIP 15463 |
23.79 |
| 2026-04-01 12:00 |
03:13:41.26 |
+80:38:49.7 |
HIP 15463 |
23.53 |
| 2026-04-02 00:00 |
03:13:46.96 |
+80:38:40.5 |
HIP 15463 |
23.27 |
| 2026-04-02 12:00 |
03:13:52.69 |
+80:38:31.5 |
HIP 15463 |
23.01 |
| 2026-04-03 00:00 |
03:13:58.45 |
+80:38:22.6 |
HIP 15463 |
22.75 |
| 2026-04-03 12:00 |
03:14:04.26 |
+80:38:13.9 |
HIP 15463 |
22.49 |
| 2026-04-04 00:00 |
03:14:10.09 |
+80:38:05.2 |
HIP 15463 |
22.23 |
| 2026-04-04 12:00 |
03:14:15.97 |
+80:37:56.7 |
HIP 15463 |
21.98 |
| 2026-04-05 00:00 |
03:14:21.87 |
+80:37:48.3 |
HIP 15463 |
21.72 |
| 2026-04-05 12:00 |
03:14:27.82 |
+80:37:40.0 |
HIP 15463 |
21.47 |
| 2026-04-06 00:00 |
03:14:33.79 |
+80:37:31.8 |
HIP 15463 |
21.22 |
| 2026-04-06 12:00 |
03:14:39.80 |
+80:37:23.8 |
HIP 15463 |
20.97 |
| 2026-04-07 00:00 |
03:14:45.84 |
+80:37:15.9 |
HIP 15463 |
20.72 |
| 2026-04-07 12:00 |
03:14:51.91 |
+80:37:08.1 |
HIP 15463 |
20.47 |
| 2026-04-08 00:00 |
03:14:58.02 |
+80:37:00.4 |
HIP 15463 |
20.23 |
| 2026-04-08 12:00 |
03:15:04.16 |
+80:36:52.9 |
HIP 15463 |
19.99 |
| 2026-04-09 00:00 |
03:15:10.33 |
+80:36:45.5 |
HIP 15463 |
19.75 |
| 2026-04-09 12:00 |
03:15:16.53 |
+80:36:38.2 |
HIP 15463 |
19.51 |
| 2026-04-10 00:00 |
03:15:22.76 |
+80:36:31.0 |
HIP 15463 |
19.27 |
| 2026-04-10 12:00 |
03:15:29.02 |
+80:36:23.9 |
HIP 15463 |
19.04 |
| 2026-04-11 00:00 |
03:15:35.31 |
+80:36:17.0 |
HIP 15463 |
18.81 |
| 2026-04-11 12:00 |
03:15:41.63 |
+80:36:10.2 |
HIP 15463 |
18.58 |
| 2026-04-12 00:00 |
03:15:47.98 |
+80:36:03.6 |
HIP 15463 |
18.35 |
| 2026-04-12 12:00 |
03:15:54.36 |
+80:35:57.0 |
HIP 15463 |
18.13 |
| 2026-04-13 00:00 |
03:16:00.76 |
+80:35:50.6 |
HIP 15463 |
17.91 |
| 2026-04-13 12:00 |
03:16:07.20 |
+80:35:44.3 |
HIP 15463 |
17.69 |
| 2026-04-14 00:00 |
03:16:13.66 |
+80:35:38.2 |
HIP 15463 |
17.48 |
| 2026-04-14 12:00 |
03:16:20.14 |
+80:35:32.1 |
HIP 15463 |
17.27 |
| 2026-04-15 00:00 |
03:16:26.66 |
+80:35:26.2 |
HIP 15463 |
17.07 |
| 2026-04-15 12:00 |
03:16:33.20 |
+80:35:20.5 |
HIP 15463 |
16.86 |
| 2026-04-16 00:00 |
03:16:39.76 |
+80:35:14.8 |
HIP 15463 |
16.67 |