メタデータ
| 項目 |
値 |
| Designation |
C/1972 L1 (Sandage) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1972-11-14T18:55:18.753600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:21Z |
| Obs used |
146 |
| NEO |
- |
| M1 |
5.600 |
| K1 |
7.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1972-10-11.0000000 |
| e |
1.00634381 |
| q (au) |
4.275741 |
| a (au) |
-674.001905 |
| i (deg) |
79.368060 |
| Ω (om, deg) |
225.486355 |
| ω (w, deg) |
56.654504 |
| M (ma, deg) |
-0.001960 |
等級
散乱 + 全体線形
$$
M_a = (6.002 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.002 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.998 |
| 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) |
| 2026-06-01 00:00 |
03:44:52.76 |
-08:57:28.2 |
HIP 17582 |
16.29 |
| 2026-06-01 12:00 |
03:44:54.25 |
-08:57:26.9 |
HIP 17582 |
15.93 |
| 2026-06-02 00:00 |
03:44:55.74 |
-08:57:25.6 |
HIP 17582 |
15.58 |
| 2026-06-02 12:00 |
03:44:57.22 |
-08:57:24.5 |
HIP 17582 |
15.22 |
| 2026-06-03 00:00 |
03:44:58.70 |
-08:57:23.5 |
HIP 17582 |
14.87 |
| 2026-06-03 12:00 |
03:45:00.18 |
-08:57:22.5 |
HIP 17582 |
14.51 |
| 2026-06-04 00:00 |
03:45:01.66 |
-08:57:21.7 |
HIP 17582 |
14.16 |
| 2026-06-04 12:00 |
03:45:03.13 |
-08:57:20.9 |
HIP 17582 |
13.81 |
| 2026-06-05 00:00 |
03:45:04.60 |
-08:57:20.3 |
HIP 17582 |
13.46 |
| 2026-06-05 12:00 |
03:45:06.07 |
-08:57:19.7 |
HIP 17582 |
13.11 |
| 2026-06-06 00:00 |
03:45:07.53 |
-08:57:19.3 |
HIP 17582 |
12.76 |
| 2026-06-06 12:00 |
03:45:08.99 |
-08:57:18.9 |
HIP 17582 |
12.41 |
| 2026-06-07 00:00 |
03:45:10.44 |
-08:57:18.7 |
HIP 17582 |
12.07 |
| 2026-06-07 12:00 |
03:45:11.90 |
-08:57:18.5 |
HIP 17582 |
11.72 |
| 2026-06-08 00:00 |
03:45:13.35 |
-08:57:18.5 |
HIP 17582 |
11.38 |
| 2026-06-08 12:00 |
03:45:14.79 |
-08:57:18.5 |
HIP 17582 |
11.04 |
| 2026-06-09 00:00 |
03:45:16.23 |
-08:57:18.7 |
HIP 17582 |
10.70 |
| 2026-06-09 12:00 |
03:45:17.67 |
-08:57:18.9 |
HIP 17582 |
10.36 |
| 2026-06-10 00:00 |
03:45:19.10 |
-08:57:19.3 |
HIP 17582 |
10.02 |
| 2026-06-10 12:00 |
03:45:20.53 |
-08:57:19.7 |
HIP 17582 |
9.68 |
| 2026-06-11 00:00 |
03:45:21.95 |
-08:57:20.2 |
HIP 17582 |
9.35 |
| 2026-06-11 12:00 |
03:45:23.37 |
-08:57:20.9 |
HIP 17582 |
9.02 |
| 2026-06-12 00:00 |
03:45:24.79 |
-08:57:21.6 |
HIP 17582 |
8.69 |
| 2026-06-12 12:00 |
03:45:26.20 |
-08:57:22.5 |
HIP 17582 |
8.36 |
| 2026-06-13 00:00 |
03:45:27.60 |
-08:57:23.4 |
HIP 17582 |
8.03 |
| 2026-06-13 12:00 |
03:45:29.00 |
-08:57:24.5 |
HIP 17582 |
7.71 |
| 2026-06-14 00:00 |
03:45:30.40 |
-08:57:25.6 |
HIP 17582 |
7.38 |
| 2026-06-14 12:00 |
03:45:31.79 |
-08:57:26.8 |
HIP 17582 |
7.06 |
| 2026-06-15 00:00 |
03:45:33.18 |
-08:57:28.2 |
HIP 17582 |
6.75 |
| 2026-06-15 12:00 |
03:45:34.56 |
-08:57:29.6 |
HIP 17582 |
6.43 |
| 2026-06-16 00:00 |
03:45:35.93 |
-08:57:31.2 |
HIP 17582 |
6.12 |
| 2026-06-16 12:00 |
03:45:37.30 |
-08:57:32.8 |
HIP 17582 |
5.82 |
| 2026-06-17 00:00 |
03:45:38.67 |
-08:57:34.6 |
HIP 17582 |
5.51 |
| 2026-06-17 12:00 |
03:45:40.02 |
-08:57:36.4 |
HIP 17582 |
5.22 |
| 2026-06-18 00:00 |
03:45:41.38 |
-08:57:38.3 |
HIP 17582 |
4.92 |
| 2026-06-18 12:00 |
03:45:42.72 |
-08:57:40.4 |
HIP 17582 |
4.64 |
| 2026-06-19 00:00 |
03:45:44.06 |
-08:57:42.5 |
HIP 17582 |
4.36 |
| 2026-06-19 12:00 |
03:45:45.40 |
-08:57:44.8 |
HIP 17582 |
4.08 |
| 2026-06-20 00:00 |
03:45:46.73 |
-08:57:47.1 |
HIP 17582 |
3.82 |
| 2026-06-20 12:00 |
03:45:48.05 |
-08:57:49.5 |
HIP 17582 |
3.57 |
| 2026-06-21 00:00 |
03:45:49.37 |
-08:57:52.1 |
HIP 17582 |
3.33 |
| 2026-06-21 12:00 |
03:45:50.67 |
-08:57:54.7 |
HIP 17582 |
3.11 |
| 2026-06-22 00:00 |
03:45:51.98 |
-08:57:57.4 |
HIP 17582 |
2.90 |