メタデータ
| 項目 |
値 |
| Designation |
C/1973 D1 (Kohoutek) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1973-06-07T04:20:15.918720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
42 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
18.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1973-04-20.0000000 |
| e |
0.99874973 |
| q (au) |
1.382021 |
| a (au) |
1105.378577 |
| i (deg) |
121.598063 |
| Ω (om, deg) |
164.817374 |
| ω (w, deg) |
74.859255 |
| M (ma, deg) |
359.998708 |
等級
散乱 + 全体線形
$$
M_a = (8.986 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.986 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
21:56:23.12 |
-64:06:02.1 |
HIP 108493 |
15.44 |
| 2026-06-01 12:00 |
21:56:22.34 |
-64:06:21.2 |
HIP 108493 |
15.49 |
| 2026-06-02 00:00 |
21:56:21.54 |
-64:06:40.3 |
HIP 108493 |
15.55 |
| 2026-06-02 12:00 |
21:56:20.71 |
-64:06:59.3 |
HIP 108493 |
15.62 |
| 2026-06-03 00:00 |
21:56:19.86 |
-64:07:18.4 |
HIP 108493 |
15.70 |
| 2026-06-03 12:00 |
21:56:18.97 |
-64:07:37.5 |
HIP 108493 |
15.78 |
| 2026-06-04 00:00 |
21:56:18.06 |
-64:07:56.6 |
HIP 108493 |
15.88 |
| 2026-06-04 12:00 |
21:56:17.12 |
-64:08:15.7 |
HIP 108493 |
15.99 |
| 2026-06-05 00:00 |
21:56:16.16 |
-64:08:34.8 |
HIP 108493 |
16.10 |
| 2026-06-05 12:00 |
21:56:15.16 |
-64:08:53.8 |
HIP 108493 |
16.23 |
| 2026-06-06 00:00 |
21:56:14.14 |
-64:09:12.9 |
HIP 108493 |
16.36 |
| 2026-06-06 12:00 |
21:56:13.10 |
-64:09:32.0 |
HIP 108493 |
16.50 |
| 2026-06-07 00:00 |
21:56:12.02 |
-64:09:51.1 |
HIP 108493 |
16.65 |
| 2026-06-07 12:00 |
21:56:10.92 |
-64:10:10.1 |
HIP 108493 |
16.81 |
| 2026-06-08 00:00 |
21:56:09.80 |
-64:10:29.1 |
HIP 108493 |
16.98 |
| 2026-06-08 12:00 |
21:56:08.64 |
-64:10:48.2 |
HIP 108493 |
17.15 |
| 2026-06-09 00:00 |
21:56:07.46 |
-64:11:07.2 |
HIP 108493 |
17.34 |
| 2026-06-09 12:00 |
21:56:06.25 |
-64:11:26.2 |
HIP 108493 |
17.53 |
| 2026-06-10 00:00 |
21:56:05.02 |
-64:11:45.2 |
HIP 108493 |
17.73 |
| 2026-06-10 12:00 |
21:56:03.76 |
-64:12:04.1 |
HIP 108493 |
17.93 |
| 2026-06-11 00:00 |
21:56:02.47 |
-64:12:23.1 |
HIP 108493 |
18.14 |
| 2026-06-11 12:00 |
21:56:01.15 |
-64:12:42.0 |
HIP 108493 |
18.36 |
| 2026-06-12 00:00 |
21:55:59.81 |
-64:13:00.9 |
HIP 108493 |
18.58 |
| 2026-06-12 12:00 |
21:55:58.45 |
-64:13:19.8 |
HIP 108493 |
18.82 |
| 2026-06-13 00:00 |
21:55:57.05 |
-64:13:38.7 |
HIP 108020 |
18.98 |
| 2026-06-13 12:00 |
21:55:55.63 |
-64:13:57.5 |
HIP 108020 |
18.83 |
| 2026-06-14 00:00 |
21:55:54.19 |
-64:14:16.3 |
HIP 108020 |
18.69 |
| 2026-06-14 12:00 |
21:55:52.72 |
-64:14:35.1 |
HIP 108020 |
18.56 |
| 2026-06-15 00:00 |
21:55:51.22 |
-64:14:53.8 |
HIP 108020 |
18.42 |
| 2026-06-15 12:00 |
21:55:49.70 |
-64:15:12.6 |
HIP 108020 |
18.29 |
| 2026-06-16 00:00 |
21:55:48.15 |
-64:15:31.2 |
HIP 108020 |
18.16 |
| 2026-06-16 12:00 |
21:55:46.57 |
-64:15:49.9 |
HIP 108020 |
18.03 |
| 2026-06-17 00:00 |
21:55:44.97 |
-64:16:08.5 |
HIP 108020 |
17.91 |
| 2026-06-17 12:00 |
21:55:43.35 |
-64:16:27.1 |
HIP 108020 |
17.79 |
| 2026-06-18 00:00 |
21:55:41.70 |
-64:16:45.6 |
HIP 108020 |
17.68 |
| 2026-06-18 12:00 |
21:55:40.02 |
-64:17:04.1 |
HIP 108020 |
17.57 |
| 2026-06-19 00:00 |
21:55:38.32 |
-64:17:22.5 |
HIP 108020 |
17.46 |
| 2026-06-19 12:00 |
21:55:36.59 |
-64:17:41.0 |
HIP 108020 |
17.36 |
| 2026-06-20 00:00 |
21:55:34.84 |
-64:17:59.3 |
HIP 108020 |
17.26 |
| 2026-06-20 12:00 |
21:55:33.07 |
-64:18:17.6 |
HIP 108020 |
17.16 |
| 2026-06-21 00:00 |
21:55:31.27 |
-64:18:35.9 |
HIP 108020 |
17.07 |
| 2026-06-21 12:00 |
21:55:29.45 |
-64:18:54.1 |
HIP 108020 |
16.98 |
| 2026-06-22 00:00 |
21:55:27.60 |
-64:19:12.3 |
HIP 108020 |
16.90 |