C/1972 L1 (Sandage)
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) |
| 2026-02-03 00:00 |
03:41:18.46 |
-09:31:26.5 |
HIP 17222 |
19.86 |
| 2026-02-03 12:00 |
03:41:18.12 |
-09:31:17.2 |
HIP 17222 |
19.71 |
| 2026-02-04 00:00 |
03:41:17.78 |
-09:31:07.9 |
HIP 17222 |
19.56 |
| 2026-02-04 12:00 |
03:41:17.46 |
-09:30:58.5 |
HIP 17222 |
19.41 |
| 2026-02-05 00:00 |
03:41:17.15 |
-09:30:49.0 |
HIP 17222 |
19.25 |
| 2026-02-05 12:00 |
03:41:16.86 |
-09:30:39.5 |
HIP 17222 |
19.10 |
| 2026-02-06 00:00 |
03:41:16.58 |
-09:30:29.9 |
HIP 17222 |
18.95 |
| 2026-02-06 12:00 |
03:41:16.31 |
-09:30:20.3 |
HIP 17222 |
18.79 |
| 2026-02-07 00:00 |
03:41:16.05 |
-09:30:10.6 |
HIP 17222 |
18.63 |
| 2026-02-07 12:00 |
03:41:15.81 |
-09:30:00.9 |
HIP 17222 |
18.48 |
| 2026-02-08 00:00 |
03:41:15.58 |
-09:29:51.1 |
HIP 17222 |
18.32 |
| 2026-02-08 12:00 |
03:41:15.37 |
-09:29:41.2 |
HIP 17222 |
18.16 |
| 2026-02-09 00:00 |
03:41:15.17 |
-09:29:31.3 |
HIP 17222 |
18.00 |
| 2026-02-09 12:00 |
03:41:14.98 |
-09:29:21.4 |
HIP 17222 |
17.84 |
| 2026-02-10 00:00 |
03:41:14.81 |
-09:29:11.4 |
HIP 17222 |
17.68 |
| 2026-02-10 12:00 |
03:41:14.65 |
-09:29:01.3 |
HIP 17222 |
17.52 |
| 2026-02-11 00:00 |
03:41:14.50 |
-09:28:51.2 |
HIP 17222 |
17.35 |
| 2026-02-11 12:00 |
03:41:14.37 |
-09:28:41.0 |
HIP 17222 |
17.19 |
| 2026-02-12 00:00 |
03:41:14.25 |
-09:28:30.8 |
HIP 17222 |
17.02 |
| 2026-02-12 12:00 |
03:41:14.14 |
-09:28:20.6 |
HIP 17222 |
16.86 |
| 2026-02-13 00:00 |
03:41:14.05 |
-09:28:10.3 |
HIP 17222 |
16.69 |
| 2026-02-13 12:00 |
03:41:13.97 |
-09:28:00.0 |
HIP 17222 |
16.52 |
| 2026-02-14 00:00 |
03:41:13.90 |
-09:27:49.6 |
HIP 17222 |
16.35 |
| 2026-02-14 12:00 |
03:41:13.85 |
-09:27:39.1 |
HIP 17222 |
16.18 |
| 2026-02-15 00:00 |
03:41:13.81 |
-09:27:28.7 |
HIP 17222 |
16.01 |
| 2026-02-15 12:00 |
03:41:13.79 |
-09:27:18.2 |
HIP 17222 |
15.83 |
| 2026-02-16 00:00 |
03:41:13.78 |
-09:27:07.6 |
HIP 17222 |
15.66 |
| 2026-02-16 12:00 |
03:41:13.78 |
-09:26:57.0 |
HIP 17222 |
15.49 |
| 2026-02-17 00:00 |
03:41:13.80 |
-09:26:46.4 |
HIP 17222 |
15.31 |
| 2026-02-17 12:00 |
03:41:13.83 |
-09:26:35.7 |
HIP 17222 |
15.13 |
| 2026-02-18 00:00 |
03:41:13.87 |
-09:26:25.0 |
HIP 17222 |
14.95 |
| 2026-02-18 12:00 |
03:41:13.93 |
-09:26:14.3 |
HIP 17222 |
14.78 |
| 2026-02-19 00:00 |
03:41:14.00 |
-09:26:03.5 |
HIP 17222 |
14.59 |
| 2026-02-19 12:00 |
03:41:14.08 |
-09:25:52.7 |
HIP 17222 |
14.41 |
| 2026-02-20 00:00 |
03:41:14.18 |
-09:25:41.8 |
HIP 17222 |
14.23 |
| 2026-02-20 12:00 |
03:41:14.29 |
-09:25:31.0 |
HIP 17222 |
14.05 |
| 2026-02-21 00:00 |
03:41:14.42 |
-09:25:20.1 |
HIP 17222 |
13.86 |
| 2026-02-21 12:00 |
03:41:14.55 |
-09:25:09.1 |
HIP 17222 |
13.68 |
| 2026-02-22 00:00 |
03:41:14.71 |
-09:24:58.2 |
HIP 17222 |
13.49 |
| 2026-02-22 12:00 |
03:41:14.87 |
-09:24:47.2 |
HIP 17222 |
13.31 |
| 2026-02-23 00:00 |
03:41:15.05 |
-09:24:36.2 |
HIP 17222 |
13.12 |
| 2026-02-23 12:00 |
03:41:15.24 |
-09:24:25.1 |
HIP 17222 |
12.93 |
| 2026-02-24 00:00 |
03:41:15.45 |
-09:24:14.0 |
HIP 17222 |
12.74 |