C/1989 A5 (Shoemaker)
メタデータ
| 項目 |
値 |
| Designation |
C/1989 A5 (Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-02-26T01:49:07.296960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
77 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1989-01-25.0000000 |
| e |
0.99551906 |
| q (au) |
2.639638 |
| a (au) |
589.081028 |
| i (deg) |
96.558535 |
| Ω (om, deg) |
137.139302 |
| ω (w, deg) |
19.104183 |
| M (ma, deg) |
359.997789 |
等級
散乱 + 全体線形
$$
M_a = (6.268 + 5.033\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.268 |
| n |
5.033 |
| gf |
1.000 |
| gb |
-0.872 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:14:45.08 |
-11:14:45.4 |
HIP 104808 |
11.35 |
| 2026-02-03 12:00 |
21:14:47.04 |
-11:14:37.7 |
HIP 104808 |
11.76 |
| 2026-02-04 00:00 |
21:14:48.99 |
-11:14:30.0 |
HIP 104808 |
12.18 |
| 2026-02-04 12:00 |
21:14:50.95 |
-11:14:22.3 |
HIP 104808 |
12.60 |
| 2026-02-05 00:00 |
21:14:52.90 |
-11:14:14.6 |
HIP 104808 |
13.03 |
| 2026-02-05 12:00 |
21:14:54.85 |
-11:14:06.8 |
HIP 104808 |
13.46 |
| 2026-02-06 00:00 |
21:14:56.81 |
-11:13:59.0 |
HIP 104808 |
13.90 |
| 2026-02-06 12:00 |
21:14:58.76 |
-11:13:51.2 |
HIP 104808 |
14.34 |
| 2026-02-07 00:00 |
21:15:00.72 |
-11:13:43.4 |
HIP 104808 |
14.78 |
| 2026-02-07 12:00 |
21:15:02.67 |
-11:13:35.6 |
HIP 104808 |
15.23 |
| 2026-02-08 00:00 |
21:15:04.62 |
-11:13:27.7 |
HIP 104808 |
15.68 |
| 2026-02-08 12:00 |
21:15:06.57 |
-11:13:19.8 |
HIP 104808 |
16.13 |
| 2026-02-09 00:00 |
21:15:08.53 |
-11:13:11.9 |
HIP 104808 |
16.58 |
| 2026-02-09 12:00 |
21:15:10.48 |
-11:13:04.0 |
HIP 104808 |
17.04 |
| 2026-02-10 00:00 |
21:15:12.42 |
-11:12:56.1 |
HIP 104808 |
17.50 |
| 2026-02-10 12:00 |
21:15:14.37 |
-11:12:48.1 |
HIP 104808 |
17.96 |
| 2026-02-11 00:00 |
21:15:16.32 |
-11:12:40.2 |
HIP 104808 |
18.42 |
| 2026-02-11 12:00 |
21:15:18.26 |
-11:12:32.2 |
HIP 104808 |
18.88 |
| 2026-02-12 00:00 |
21:15:20.20 |
-11:12:24.2 |
HIP 104808 |
19.35 |
| 2026-02-12 12:00 |
21:15:22.14 |
-11:12:16.2 |
HIP 104808 |
19.81 |
| 2026-02-13 00:00 |
21:15:24.08 |
-11:12:08.2 |
HIP 104808 |
20.28 |
| 2026-02-13 12:00 |
21:15:26.02 |
-11:12:00.1 |
HIP 104808 |
20.74 |
| 2026-02-14 00:00 |
21:15:27.95 |
-11:11:52.1 |
HIP 104808 |
21.21 |
| 2026-02-14 12:00 |
21:15:29.88 |
-11:11:44.0 |
HIP 104808 |
21.68 |
| 2026-02-15 00:00 |
21:15:31.81 |
-11:11:36.0 |
HIP 104808 |
22.15 |
| 2026-02-15 12:00 |
21:15:33.74 |
-11:11:27.9 |
HIP 104808 |
22.62 |
| 2026-02-16 00:00 |
21:15:35.66 |
-11:11:19.8 |
HIP 104808 |
23.08 |
| 2026-02-16 12:00 |
21:15:37.58 |
-11:11:11.7 |
HIP 104808 |
23.55 |
| 2026-02-17 00:00 |
21:15:39.50 |
-11:11:03.6 |
HIP 104808 |
24.02 |
| 2026-02-17 12:00 |
21:15:41.41 |
-11:10:55.5 |
HIP 104808 |
24.49 |
| 2026-02-18 00:00 |
21:15:43.32 |
-11:10:47.4 |
HIP 104808 |
24.96 |
| 2026-02-18 12:00 |
21:15:45.22 |
-11:10:39.3 |
HIP 104808 |
25.43 |
| 2026-02-19 00:00 |
21:15:47.13 |
-11:10:31.2 |
HIP 104808 |
25.90 |
| 2026-02-19 12:00 |
21:15:49.02 |
-11:10:23.0 |
HIP 104808 |
26.36 |
| 2026-02-20 00:00 |
21:15:50.92 |
-11:10:14.9 |
HIP 104808 |
26.83 |
| 2026-02-20 12:00 |
21:15:52.81 |
-11:10:06.8 |
HIP 104808 |
27.30 |
| 2026-02-21 00:00 |
21:15:54.69 |
-11:09:58.7 |
HIP 104808 |
27.76 |
| 2026-02-21 12:00 |
21:15:56.57 |
-11:09:50.5 |
HIP 104808 |
28.23 |
| 2026-02-22 00:00 |
21:15:58.45 |
-11:09:42.4 |
HIP 104808 |
28.70 |
| 2026-02-22 12:00 |
21:16:00.32 |
-11:09:34.3 |
HIP 104808 |
29.16 |
| 2026-02-23 00:00 |
21:16:02.19 |
-11:09:26.2 |
HIP 104808 |
29.62 |
| 2026-02-23 12:00 |
21:16:04.05 |
-11:09:18.0 |
HIP 104808 |
30.09 |
| 2026-02-24 00:00 |
21:16:05.90 |
-11:09:09.9 |
HIP 104808 |
30.55 |