メタデータ
| 項目 |
値 |
| Designation |
C/1973 N1 (Sandage) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1973-11-08T03:45:29.695680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
27 |
| NEO |
- |
| M1 |
6.200 |
| 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) |
1974-02-27.0000000 |
| e |
1.00022570 |
| q (au) |
4.812051 |
| a (au) |
-21320.457837 |
| i (deg) |
137.403627 |
| Ω (om, deg) |
279.241065 |
| ω (w, deg) |
72.546350 |
| M (ma, deg) |
0.000035 |
等級
散乱 + 全体線形
$$
M_a = (7.938 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.938 |
| n |
6.000 |
| gf |
0.996 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-03-26 00:00 |
04:27:28.79 |
-06:03:29.7 |
HIP 20793 |
13.01 |
| 2026-03-26 12:00 |
04:27:29.43 |
-06:03:19.0 |
HIP 20793 |
12.86 |
| 2026-03-27 00:00 |
04:27:30.09 |
-06:03:08.2 |
HIP 20793 |
12.71 |
| 2026-03-27 12:00 |
04:27:30.75 |
-06:02:57.5 |
HIP 20793 |
12.57 |
| 2026-03-28 00:00 |
04:27:31.43 |
-06:02:46.7 |
HIP 20793 |
12.43 |
| 2026-03-28 12:00 |
04:27:32.12 |
-06:02:36.0 |
HIP 20793 |
12.30 |
| 2026-03-29 00:00 |
04:27:32.82 |
-06:02:25.4 |
HIP 20793 |
12.16 |
| 2026-03-29 12:00 |
04:27:33.53 |
-06:02:14.7 |
HIP 20793 |
12.04 |
| 2026-03-30 00:00 |
04:27:34.26 |
-06:02:04.1 |
HIP 20793 |
11.92 |
| 2026-03-30 12:00 |
04:27:34.99 |
-06:01:53.5 |
HIP 20793 |
11.80 |
| 2026-03-31 00:00 |
04:27:35.74 |
-06:01:42.9 |
HIP 20793 |
11.69 |
| 2026-03-31 12:00 |
04:27:36.50 |
-06:01:32.4 |
HIP 20793 |
11.59 |
| 2026-04-01 00:00 |
04:27:37.27 |
-06:01:21.9 |
HIP 20793 |
11.49 |
| 2026-04-01 12:00 |
04:27:38.05 |
-06:01:11.4 |
HIP 20793 |
11.40 |
| 2026-04-02 00:00 |
04:27:38.84 |
-06:01:01.0 |
HIP 20793 |
11.32 |
| 2026-04-02 12:00 |
04:27:39.65 |
-06:00:50.5 |
HIP 20793 |
11.24 |
| 2026-04-03 00:00 |
04:27:40.46 |
-06:00:40.1 |
HIP 20793 |
11.17 |
| 2026-04-03 12:00 |
04:27:41.29 |
-06:00:29.8 |
HIP 20793 |
11.11 |
| 2026-04-04 00:00 |
04:27:42.13 |
-06:00:19.5 |
HIP 20793 |
11.06 |
| 2026-04-04 12:00 |
04:27:42.97 |
-06:00:09.2 |
HIP 20793 |
11.01 |
| 2026-04-05 00:00 |
04:27:43.83 |
-05:59:58.9 |
HIP 20793 |
10.97 |
| 2026-04-05 12:00 |
04:27:44.70 |
-05:59:48.7 |
HIP 20793 |
10.95 |
| 2026-04-06 00:00 |
04:27:45.58 |
-05:59:38.5 |
HIP 20793 |
10.93 |
| 2026-04-06 12:00 |
04:27:46.47 |
-05:59:28.3 |
HIP 20793 |
10.92 |
| 2026-04-07 00:00 |
04:27:47.37 |
-05:59:18.2 |
HIP 20793 |
10.92 |
| 2026-04-07 12:00 |
04:27:48.28 |
-05:59:08.1 |
HIP 20793 |
10.92 |
| 2026-04-08 00:00 |
04:27:49.20 |
-05:58:58.1 |
HIP 20793 |
10.94 |
| 2026-04-08 12:00 |
04:27:50.14 |
-05:58:48.1 |
HIP 20793 |
10.97 |
| 2026-04-09 00:00 |
04:27:51.08 |
-05:58:38.2 |
HIP 20793 |
11.00 |
| 2026-04-09 12:00 |
04:27:52.03 |
-05:58:28.2 |
HIP 20793 |
11.05 |
| 2026-04-10 00:00 |
04:27:52.99 |
-05:58:18.4 |
HIP 20793 |
11.11 |
| 2026-04-10 12:00 |
04:27:53.97 |
-05:58:08.5 |
HIP 20793 |
11.17 |
| 2026-04-11 00:00 |
04:27:54.95 |
-05:57:58.7 |
HIP 20793 |
11.25 |
| 2026-04-11 12:00 |
04:27:55.94 |
-05:57:49.0 |
HIP 20793 |
11.33 |
| 2026-04-12 00:00 |
04:27:56.94 |
-05:57:39.3 |
HIP 20793 |
11.43 |
| 2026-04-12 12:00 |
04:27:57.96 |
-05:57:29.6 |
HIP 20793 |
11.53 |
| 2026-04-13 00:00 |
04:27:58.98 |
-05:57:20.0 |
HIP 20793 |
11.64 |
| 2026-04-13 12:00 |
04:28:00.01 |
-05:57:10.4 |
HIP 20793 |
11.76 |
| 2026-04-14 00:00 |
04:28:01.05 |
-05:57:00.9 |
HIP 20793 |
11.89 |
| 2026-04-14 12:00 |
04:28:02.10 |
-05:56:51.5 |
HIP 20793 |
12.03 |
| 2026-04-15 00:00 |
04:28:03.16 |
-05:56:42.0 |
HIP 20793 |
12.18 |
| 2026-04-15 12:00 |
04:28:04.23 |
-05:56:32.7 |
HIP 20793 |
12.34 |
| 2026-04-16 00:00 |
04:28:05.31 |
-05:56:23.4 |
HIP 20793 |
12.50 |