メタデータ
| 項目 |
値 |
| Designation |
C/1974 O1 (Cesco) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1974-05-12T23:37:48.135360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
18 |
| 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) |
1974-08-21.0000000 |
| e |
0.97938205 |
| q (au) |
1.372893 |
| a (au) |
66.587290 |
| i (deg) |
173.158463 |
| Ω (om, deg) |
165.740646 |
| ω (w, deg) |
176.764065 |
| M (ma, deg) |
0.181420 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
11:56:12.39 |
-01:27:46.9 |
HIP 58191 |
3.05 |
| 2026-07-29 12:00 |
11:56:13.30 |
-01:27:52.1 |
HIP 58191 |
3.30 |
| 2026-07-30 00:00 |
11:56:14.23 |
-01:27:57.4 |
HIP 58191 |
3.54 |
| 2026-07-30 12:00 |
11:56:15.17 |
-01:28:02.7 |
HIP 58191 |
3.79 |
| 2026-07-31 00:00 |
11:56:16.12 |
-01:28:08.2 |
HIP 58191 |
4.05 |
| 2026-07-31 12:00 |
11:56:17.08 |
-01:28:13.7 |
HIP 58191 |
4.30 |
| 2026-08-01 00:00 |
11:56:18.05 |
-01:28:19.2 |
HIP 58191 |
4.56 |
| 2026-08-01 12:00 |
11:56:19.03 |
-01:28:24.9 |
HIP 58191 |
4.83 |
| 2026-08-02 00:00 |
11:56:20.01 |
-01:28:30.6 |
HIP 58191 |
5.09 |
| 2026-08-02 12:00 |
11:56:21.01 |
-01:28:36.3 |
HIP 58191 |
5.36 |
| 2026-08-03 00:00 |
11:56:22.02 |
-01:28:42.2 |
HIP 58191 |
5.63 |
| 2026-08-03 12:00 |
11:56:23.04 |
-01:28:48.1 |
HIP 58191 |
5.90 |
| 2026-08-04 00:00 |
11:56:24.07 |
-01:28:54.1 |
HIP 58191 |
6.18 |
| 2026-08-04 12:00 |
11:56:25.11 |
-01:29:00.1 |
HIP 58191 |
6.45 |
| 2026-08-05 00:00 |
11:56:26.15 |
-01:29:06.2 |
HIP 58191 |
6.74 |
| 2026-08-05 12:00 |
11:56:27.21 |
-01:29:12.4 |
HIP 58191 |
7.02 |
| 2026-08-06 00:00 |
11:56:28.28 |
-01:29:18.7 |
HIP 58191 |
7.30 |
| 2026-08-06 12:00 |
11:56:29.35 |
-01:29:25.0 |
HIP 58191 |
7.59 |
| 2026-08-07 00:00 |
11:56:30.44 |
-01:29:31.3 |
HIP 58191 |
7.88 |
| 2026-08-07 12:00 |
11:56:31.54 |
-01:29:37.8 |
HIP 58191 |
8.18 |
| 2026-08-08 00:00 |
11:56:32.64 |
-01:29:44.3 |
HIP 58191 |
8.48 |
| 2026-08-08 12:00 |
11:56:33.75 |
-01:29:50.9 |
HIP 58191 |
8.77 |
| 2026-08-09 00:00 |
11:56:34.87 |
-01:29:57.5 |
HIP 58191 |
9.08 |
| 2026-08-09 12:00 |
11:56:36.00 |
-01:30:04.2 |
HIP 58191 |
9.38 |
| 2026-08-10 00:00 |
11:56:37.14 |
-01:30:11.0 |
HIP 58191 |
9.69 |
| 2026-08-10 12:00 |
11:56:38.29 |
-01:30:17.8 |
HIP 58191 |
9.99 |
| 2026-08-11 00:00 |
11:56:39.45 |
-01:30:24.7 |
HIP 58191 |
10.31 |
| 2026-08-11 12:00 |
11:56:40.62 |
-01:30:31.7 |
HIP 58191 |
10.62 |
| 2026-08-12 00:00 |
11:56:41.79 |
-01:30:38.7 |
HIP 58191 |
10.94 |
| 2026-08-12 12:00 |
11:56:42.97 |
-01:30:45.7 |
HIP 58191 |
11.25 |
| 2026-08-13 00:00 |
11:56:44.17 |
-01:30:52.9 |
HIP 58191 |
11.57 |
| 2026-08-13 12:00 |
11:56:45.37 |
-01:31:00.1 |
HIP 58191 |
11.90 |
| 2026-08-14 00:00 |
11:56:46.57 |
-01:31:07.3 |
HIP 58191 |
12.22 |
| 2026-08-14 12:00 |
11:56:47.79 |
-01:31:14.6 |
HIP 58191 |
12.55 |
| 2026-08-15 00:00 |
11:56:49.01 |
-01:31:22.0 |
HIP 58191 |
12.88 |
| 2026-08-15 12:00 |
11:56:50.24 |
-01:31:29.4 |
HIP 58191 |
13.21 |
| 2026-08-16 00:00 |
11:56:51.48 |
-01:31:36.9 |
HIP 58191 |
13.54 |
| 2026-08-16 12:00 |
11:56:52.73 |
-01:31:44.4 |
HIP 58191 |
13.88 |
| 2026-08-17 00:00 |
11:56:53.99 |
-01:31:52.0 |
HIP 58191 |
14.22 |
| 2026-08-17 12:00 |
11:56:55.25 |
-01:31:59.7 |
HIP 58191 |
14.56 |
| 2026-08-18 00:00 |
11:56:56.52 |
-01:32:07.4 |
HIP 58191 |
14.90 |
| 2026-08-18 12:00 |
11:56:57.80 |
-01:32:15.1 |
HIP 58191 |
15.25 |
| 2026-08-19 00:00 |
11:56:59.08 |
-01:32:22.9 |
HIP 58191 |
15.59 |