C/1975 X1 (Sato)
メタデータ
| 項目 |
値 |
| Designation |
C/1975 X1 (Sato) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-01-03T22:01:50.992320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1975-12-19.0000000 |
| e |
1.00150800 |
| q (au) |
0.863970 |
| a (au) |
-572.924348 |
| i (deg) |
93.957122 |
| Ω (om, deg) |
281.495433 |
| ω (w, deg) |
215.462906 |
| M (ma, deg) |
-0.001144 |
等級
散乱 + 全体線形
$$
M_a = (11.258 + 5.272\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.258 |
| n |
5.272 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
18:38:07.16 |
-00:32:17.5 |
HIP 91352 |
9.51 |
| 2026-02-03 12:00 |
18:38:08.43 |
-00:32:10.9 |
HIP 91352 |
9.50 |
| 2026-02-04 00:00 |
18:38:09.68 |
-00:32:04.1 |
HIP 91352 |
9.50 |
| 2026-02-04 12:00 |
18:38:10.93 |
-00:31:57.4 |
HIP 91352 |
9.51 |
| 2026-02-05 00:00 |
18:38:12.17 |
-00:31:50.5 |
HIP 91352 |
9.52 |
| 2026-02-05 12:00 |
18:38:13.41 |
-00:31:43.6 |
HIP 91352 |
9.55 |
| 2026-02-06 00:00 |
18:38:14.63 |
-00:31:36.7 |
HIP 91352 |
9.59 |
| 2026-02-06 12:00 |
18:38:15.85 |
-00:31:29.7 |
HIP 91352 |
9.63 |
| 2026-02-07 00:00 |
18:38:17.06 |
-00:31:22.6 |
HIP 91352 |
9.69 |
| 2026-02-07 12:00 |
18:38:18.26 |
-00:31:15.5 |
HIP 91352 |
9.75 |
| 2026-02-08 00:00 |
18:38:19.45 |
-00:31:08.4 |
HIP 91352 |
9.82 |
| 2026-02-08 12:00 |
18:38:20.63 |
-00:31:01.2 |
HIP 91352 |
9.90 |
| 2026-02-09 00:00 |
18:38:21.81 |
-00:30:53.9 |
HIP 91352 |
9.98 |
| 2026-02-09 12:00 |
18:38:22.97 |
-00:30:46.6 |
HIP 91352 |
10.08 |
| 2026-02-10 00:00 |
18:38:24.13 |
-00:30:39.2 |
HIP 91352 |
10.18 |
| 2026-02-10 12:00 |
18:38:25.28 |
-00:30:31.8 |
HIP 91352 |
10.29 |
| 2026-02-11 00:00 |
18:38:26.42 |
-00:30:24.3 |
HIP 91352 |
10.40 |
| 2026-02-11 12:00 |
18:38:27.55 |
-00:30:16.8 |
HIP 91352 |
10.52 |
| 2026-02-12 00:00 |
18:38:28.67 |
-00:30:09.2 |
HIP 91352 |
10.64 |
| 2026-02-12 12:00 |
18:38:29.78 |
-00:30:01.6 |
HIP 91352 |
10.77 |
| 2026-02-13 00:00 |
18:38:30.89 |
-00:29:53.9 |
HIP 91352 |
10.91 |
| 2026-02-13 12:00 |
18:38:31.98 |
-00:29:46.2 |
HIP 91352 |
11.04 |
| 2026-02-14 00:00 |
18:38:33.06 |
-00:29:38.5 |
HIP 91352 |
11.19 |
| 2026-02-14 12:00 |
18:38:34.14 |
-00:29:30.7 |
HIP 91352 |
11.33 |
| 2026-02-15 00:00 |
18:38:35.20 |
-00:29:22.8 |
HIP 91352 |
11.48 |
| 2026-02-15 12:00 |
18:38:36.26 |
-00:29:14.9 |
HIP 91352 |
11.64 |
| 2026-02-16 00:00 |
18:38:37.30 |
-00:29:07.0 |
HIP 91352 |
11.79 |
| 2026-02-16 12:00 |
18:38:38.34 |
-00:28:59.0 |
HIP 91352 |
11.95 |
| 2026-02-17 00:00 |
18:38:39.36 |
-00:28:51.0 |
HIP 91352 |
12.11 |
| 2026-02-17 12:00 |
18:38:40.38 |
-00:28:42.9 |
HIP 91352 |
12.27 |
| 2026-02-18 00:00 |
18:38:41.38 |
-00:28:34.8 |
HIP 91352 |
12.44 |
| 2026-02-18 12:00 |
18:38:42.37 |
-00:28:26.6 |
HIP 91352 |
12.60 |
| 2026-02-19 00:00 |
18:38:43.36 |
-00:28:18.4 |
HIP 91352 |
12.77 |
| 2026-02-19 12:00 |
18:38:44.33 |
-00:28:10.2 |
HIP 91352 |
12.94 |
| 2026-02-20 00:00 |
18:38:45.29 |
-00:28:01.9 |
HIP 91352 |
13.11 |
| 2026-02-20 12:00 |
18:38:46.25 |
-00:27:53.6 |
HIP 91352 |
13.28 |
| 2026-02-21 00:00 |
18:38:47.19 |
-00:27:45.2 |
HIP 91352 |
13.45 |
| 2026-02-21 12:00 |
18:38:48.12 |
-00:27:36.8 |
HIP 91352 |
13.63 |
| 2026-02-22 00:00 |
18:38:49.04 |
-00:27:28.4 |
HIP 91352 |
13.80 |
| 2026-02-22 12:00 |
18:38:49.95 |
-00:27:19.9 |
HIP 91352 |
13.97 |
| 2026-02-23 00:00 |
18:38:50.85 |
-00:27:11.4 |
HIP 91352 |
14.15 |
| 2026-02-23 12:00 |
18:38:51.74 |
-00:27:02.9 |
HIP 91352 |
14.32 |
| 2026-02-24 00:00 |
18:38:52.61 |
-00:26:54.3 |
HIP 91352 |
14.49 |