メタデータ
| 項目 |
値 |
| Designation |
75D/Kohoutek |
| Type |
D |
| Perihelion (tp_cal, UTC) |
1994-06-29T21:33:48.680640Z |
| Orbit solution date (soln_date, UTC) |
2000-09-07T10:28:10Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1994-06-17.0000000 |
| e |
0.49630740 |
| q (au) |
1.784657 |
| a (au) |
3.543147 |
| i (deg) |
5.907209 |
| Ω (om, deg) |
269.686095 |
| ω (w, deg) |
175.801725 |
| M (ma, deg) |
358.093842 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
21:13:20.98 |
-12:46:59.5 |
HIP 104817 |
22.12 |
| 2026-03-26 12:00 |
21:13:46.69 |
-12:44:36.5 |
HIP 104817 |
17.37 |
| 2026-03-27 00:00 |
21:14:12.31 |
-12:42:13.5 |
HIP 104817 |
14.29 |
| 2026-03-27 12:00 |
21:14:37.85 |
-12:39:50.5 |
HIP 104817 |
14.00 |
| 2026-03-28 00:00 |
21:15:03.31 |
-12:37:27.5 |
HIP 104817 |
16.62 |
| 2026-03-28 12:00 |
21:15:28.67 |
-12:35:04.5 |
HIP 104817 |
21.07 |
| 2026-03-29 00:00 |
21:15:53.95 |
-12:32:41.5 |
HIP 104817 |
26.44 |
| 2026-03-29 12:00 |
21:16:19.15 |
-12:30:18.5 |
HIP 104817 |
32.25 |
| 2026-03-30 00:00 |
21:16:44.25 |
-12:27:55.6 |
HIP 105194 |
27.72 |
| 2026-03-30 12:00 |
21:17:09.27 |
-12:25:32.7 |
HIP 105189 |
21.96 |
| 2026-03-31 00:00 |
21:17:34.19 |
-12:23:09.8 |
HIP 105189 |
15.45 |
| 2026-03-31 12:00 |
21:17:59.03 |
-12:20:47.0 |
HIP 105189 |
9.01 |
| 2026-04-01 00:00 |
21:18:23.77 |
-12:18:24.2 |
HIP 105189 |
2.93 |
| 2026-04-01 12:00 |
21:18:48.42 |
-12:16:01.4 |
HIP 105189 |
4.49 |
| 2026-04-02 00:00 |
21:19:12.98 |
-12:13:38.8 |
HIP 105189 |
10.73 |
| 2026-04-02 12:00 |
21:19:37.45 |
-12:11:16.1 |
HIP 105189 |
17.11 |
| 2026-04-03 00:00 |
21:20:01.82 |
-12:08:53.6 |
HIP 105189 |
23.50 |
| 2026-04-03 12:00 |
21:20:26.10 |
-12:06:31.1 |
HIP 105189 |
29.87 |
| 2026-04-04 00:00 |
21:20:50.29 |
-12:04:08.7 |
HIP 105189 |
36.23 |
| 2026-04-04 12:00 |
21:21:14.37 |
-12:01:46.3 |
HIP 105451 |
34.50 |
| 2026-04-05 00:00 |
21:21:38.36 |
-11:59:24.1 |
HIP 105633 |
30.49 |
| 2026-04-05 12:00 |
21:22:02.25 |
-11:57:01.9 |
HIP 105633 |
25.23 |
| 2026-04-06 00:00 |
21:22:26.05 |
-11:54:39.9 |
HIP 105633 |
20.58 |
| 2026-04-06 12:00 |
21:22:49.74 |
-11:52:17.9 |
HIP 105633 |
17.04 |
| 2026-04-07 00:00 |
21:23:13.34 |
-11:49:56.1 |
HIP 105633 |
15.35 |
| 2026-04-07 12:00 |
21:23:36.83 |
-11:47:34.3 |
HIP 105633 |
16.08 |
| 2026-04-08 00:00 |
21:24:00.22 |
-11:45:12.7 |
HIP 105633 |
18.94 |
| 2026-04-08 12:00 |
21:24:23.51 |
-11:42:51.2 |
HIP 105633 |
23.12 |
| 2026-04-09 00:00 |
21:24:46.69 |
-11:40:29.9 |
HIP 105633 |
28.03 |
| 2026-04-09 12:00 |
21:25:09.77 |
-11:38:08.7 |
HIP 105856 |
33.15 |
| 2026-04-10 00:00 |
21:25:32.75 |
-11:35:47.6 |
HIP 105965 |
31.08 |
| 2026-04-10 12:00 |
21:25:55.62 |
-11:33:26.7 |
HIP 105965 |
26.03 |
| 2026-04-11 00:00 |
21:26:18.38 |
-11:31:06.0 |
HIP 105965 |
21.55 |
| 2026-04-11 12:00 |
21:26:41.03 |
-11:28:45.4 |
HIP 105965 |
18.02 |
| 2026-04-12 00:00 |
21:27:03.57 |
-11:26:25.0 |
HIP 105965 |
16.06 |
| 2026-04-12 12:00 |
21:27:26.00 |
-11:24:04.7 |
HIP 106007 |
15.43 |
| 2026-04-13 00:00 |
21:27:48.32 |
-11:21:44.7 |
HIP 106007 |
13.85 |
| 2026-04-13 12:00 |
21:28:10.53 |
-11:19:24.8 |
HIP 106007 |
14.70 |
| 2026-04-14 00:00 |
21:28:32.63 |
-11:17:05.2 |
HIP 106007 |
17.61 |
| 2026-04-14 12:00 |
21:28:54.61 |
-11:14:45.7 |
HIP 106007 |
21.75 |
| 2026-04-15 00:00 |
21:29:16.48 |
-11:12:26.5 |
HIP 106007 |
26.52 |
| 2026-04-15 12:00 |
21:29:38.23 |
-11:10:07.5 |
HIP 106007 |
31.64 |
| 2026-04-16 00:00 |
21:29:59.86 |
-11:07:48.7 |
HIP 106007 |
36.94 |