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 |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.993 |
| 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 |
03:41:50.70 |
-09:12:57.5 |
HIP 17222 |
7.16 |
| 2026-03-26 12:00 |
03:41:51.64 |
-09:12:46.6 |
HIP 17222 |
7.36 |
| 2026-03-27 00:00 |
03:41:52.58 |
-09:12:35.7 |
HIP 17222 |
7.57 |
| 2026-03-27 12:00 |
03:41:53.54 |
-09:12:24.9 |
HIP 17222 |
7.78 |
| 2026-03-28 00:00 |
03:41:54.51 |
-09:12:14.1 |
HIP 17222 |
8.00 |
| 2026-03-28 12:00 |
03:41:55.49 |
-09:12:03.3 |
HIP 17222 |
8.23 |
| 2026-03-29 00:00 |
03:41:56.48 |
-09:11:52.5 |
HIP 17222 |
8.47 |
| 2026-03-29 12:00 |
03:41:57.48 |
-09:11:41.8 |
HIP 17222 |
8.71 |
| 2026-03-30 00:00 |
03:41:58.49 |
-09:11:31.1 |
HIP 17222 |
8.96 |
| 2026-03-30 12:00 |
03:41:59.51 |
-09:11:20.5 |
HIP 17222 |
9.21 |
| 2026-03-31 00:00 |
03:42:00.54 |
-09:11:09.8 |
HIP 17222 |
9.47 |
| 2026-03-31 12:00 |
03:42:01.57 |
-09:10:59.3 |
HIP 17222 |
9.74 |
| 2026-04-01 00:00 |
03:42:02.62 |
-09:10:48.7 |
HIP 17222 |
10.01 |
| 2026-04-01 12:00 |
03:42:03.68 |
-09:10:38.2 |
HIP 17222 |
10.28 |
| 2026-04-02 00:00 |
03:42:04.74 |
-09:10:27.8 |
HIP 17222 |
10.56 |
| 2026-04-02 12:00 |
03:42:05.82 |
-09:10:17.3 |
HIP 17222 |
10.85 |
| 2026-04-03 00:00 |
03:42:06.90 |
-09:10:07.0 |
HIP 17222 |
11.13 |
| 2026-04-03 12:00 |
03:42:07.99 |
-09:09:56.6 |
HIP 17222 |
11.43 |
| 2026-04-04 00:00 |
03:42:09.09 |
-09:09:46.3 |
HIP 17222 |
11.72 |
| 2026-04-04 12:00 |
03:42:10.20 |
-09:09:36.1 |
HIP 17222 |
12.02 |
| 2026-04-05 00:00 |
03:42:11.32 |
-09:09:25.9 |
HIP 17222 |
12.32 |
| 2026-04-05 12:00 |
03:42:12.45 |
-09:09:15.7 |
HIP 17222 |
12.62 |
| 2026-04-06 00:00 |
03:42:13.59 |
-09:09:05.6 |
HIP 17222 |
12.93 |
| 2026-04-06 12:00 |
03:42:14.73 |
-09:08:55.5 |
HIP 17222 |
13.24 |
| 2026-04-07 00:00 |
03:42:15.89 |
-09:08:45.5 |
HIP 17222 |
13.55 |
| 2026-04-07 12:00 |
03:42:17.05 |
-09:08:35.5 |
HIP 17222 |
13.87 |
| 2026-04-08 00:00 |
03:42:18.22 |
-09:08:25.5 |
HIP 17222 |
14.19 |
| 2026-04-08 12:00 |
03:42:19.40 |
-09:08:15.6 |
HIP 17222 |
14.51 |
| 2026-04-09 00:00 |
03:42:20.58 |
-09:08:05.8 |
HIP 17222 |
14.83 |
| 2026-04-09 12:00 |
03:42:21.78 |
-09:07:56.0 |
HIP 17222 |
15.16 |
| 2026-04-10 00:00 |
03:42:22.98 |
-09:07:46.3 |
HIP 17222 |
15.49 |
| 2026-04-10 12:00 |
03:42:24.19 |
-09:07:36.6 |
HIP 17222 |
15.82 |
| 2026-04-11 00:00 |
03:42:25.41 |
-09:07:27.0 |
HIP 17222 |
16.15 |
| 2026-04-11 12:00 |
03:42:26.63 |
-09:07:17.4 |
HIP 17222 |
16.48 |
| 2026-04-12 00:00 |
03:42:27.87 |
-09:07:07.9 |
HIP 17222 |
16.82 |
| 2026-04-12 12:00 |
03:42:29.11 |
-09:06:58.4 |
HIP 17360 |
17.09 |
| 2026-04-13 00:00 |
03:42:30.36 |
-09:06:49.0 |
HIP 17360 |
16.83 |
| 2026-04-13 12:00 |
03:42:31.61 |
-09:06:39.6 |
HIP 17360 |
16.56 |
| 2026-04-14 00:00 |
03:42:32.88 |
-09:06:30.3 |
HIP 17360 |
16.30 |
| 2026-04-14 12:00 |
03:42:34.15 |
-09:06:21.1 |
HIP 17360 |
16.05 |
| 2026-04-15 00:00 |
03:42:35.42 |
-09:06:11.9 |
HIP 17360 |
15.79 |
| 2026-04-15 12:00 |
03:42:36.71 |
-09:06:02.7 |
HIP 17360 |
15.54 |
| 2026-04-16 00:00 |
03:42:38.00 |
-09:05:53.7 |
HIP 17360 |
15.30 |