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) |
| 2026-07-29 00:00 |
21:38:30.93 |
-07:36:37.6 |
HIP 106842 |
3.91 |
| 2026-07-29 12:00 |
21:38:10.44 |
-07:37:38.9 |
HIP 106842 |
6.12 |
| 2026-07-30 00:00 |
21:37:49.79 |
-07:38:41.4 |
HIP 106842 |
10.69 |
| 2026-07-30 12:00 |
21:37:28.98 |
-07:39:45.0 |
HIP 106727 |
10.72 |
| 2026-07-31 00:00 |
21:37:08.02 |
-07:40:49.7 |
HIP 106727 |
8.13 |
| 2026-07-31 12:00 |
21:36:46.91 |
-07:41:55.6 |
HIP 106727 |
8.58 |
| 2026-08-01 00:00 |
21:36:25.66 |
-07:43:02.6 |
HIP 106727 |
11.79 |
| 2026-08-01 12:00 |
21:36:04.26 |
-07:44:10.7 |
HIP 106727 |
16.22 |
| 2026-08-02 00:00 |
21:35:42.72 |
-07:45:19.9 |
HIP 106510 |
20.23 |
| 2026-08-02 12:00 |
21:35:21.05 |
-07:46:30.2 |
HIP 106510 |
14.95 |
| 2026-08-03 00:00 |
21:34:59.24 |
-07:47:41.5 |
HIP 106510 |
9.89 |
| 2026-08-03 12:00 |
21:34:37.31 |
-07:48:53.9 |
HIP 106510 |
5.76 |
| 2026-08-04 00:00 |
21:34:15.25 |
-07:50:07.4 |
HIP 106510 |
5.54 |
| 2026-08-04 12:00 |
21:33:53.07 |
-07:51:21.9 |
HIP 106510 |
9.57 |
| 2026-08-05 00:00 |
21:33:30.77 |
-07:52:37.4 |
HIP 106510 |
14.73 |
| 2026-08-05 12:00 |
21:33:08.36 |
-07:53:53.8 |
HIP 106510 |
20.19 |
| 2026-08-06 00:00 |
21:32:45.84 |
-07:55:11.3 |
HIP 106449 |
24.06 |
| 2026-08-06 12:00 |
21:32:23.22 |
-07:56:29.8 |
HIP 106449 |
28.46 |
| 2026-08-07 00:00 |
21:32:00.50 |
-07:57:49.1 |
HIP 106449 |
33.30 |
| 2026-08-07 12:00 |
21:31:37.67 |
-07:59:09.5 |
HIP 106449 |
38.43 |
| 2026-08-08 00:00 |
21:31:14.76 |
-08:00:30.7 |
HIP 106142 |
40.30 |
| 2026-08-08 12:00 |
21:30:51.76 |
-08:01:52.8 |
HIP 106142 |
36.68 |
| 2026-08-09 00:00 |
21:30:28.67 |
-08:03:15.9 |
HIP 106142 |
33.68 |
| 2026-08-09 12:00 |
21:30:05.50 |
-08:04:39.8 |
HIP 106142 |
31.48 |
| 2026-08-10 00:00 |
21:29:42.26 |
-08:06:04.5 |
HIP 106142 |
30.27 |
| 2026-08-10 12:00 |
21:29:18.95 |
-08:07:30.0 |
HIP 105970 |
27.18 |
| 2026-08-11 00:00 |
21:28:55.58 |
-08:08:56.4 |
HIP 105970 |
21.56 |
| 2026-08-11 12:00 |
21:28:32.14 |
-08:10:23.5 |
HIP 105970 |
16.16 |
| 2026-08-12 00:00 |
21:28:08.65 |
-08:11:51.4 |
HIP 105970 |
11.35 |
| 2026-08-12 12:00 |
21:27:45.11 |
-08:13:20.1 |
HIP 105970 |
8.25 |
| 2026-08-13 00:00 |
21:27:21.53 |
-08:14:49.4 |
HIP 105970 |
8.92 |
| 2026-08-13 12:00 |
21:26:57.90 |
-08:16:19.5 |
HIP 105970 |
12.79 |
| 2026-08-14 00:00 |
21:26:34.24 |
-08:17:50.2 |
HIP 105970 |
17.91 |
| 2026-08-14 12:00 |
21:26:10.54 |
-08:19:21.6 |
HIP 105734 |
20.23 |
| 2026-08-15 00:00 |
21:25:46.83 |
-08:20:53.6 |
HIP 105734 |
16.04 |
| 2026-08-15 12:00 |
21:25:23.09 |
-08:22:26.3 |
HIP 105734 |
13.39 |
| 2026-08-16 00:00 |
21:24:59.33 |
-08:23:59.5 |
HIP 105734 |
13.24 |
| 2026-08-16 12:00 |
21:24:35.57 |
-08:25:33.2 |
HIP 105734 |
15.67 |
| 2026-08-17 00:00 |
21:24:11.80 |
-08:27:07.6 |
HIP 105734 |
19.75 |
| 2026-08-17 12:00 |
21:23:48.03 |
-08:28:42.4 |
HIP 105734 |
24.67 |
| 2026-08-18 00:00 |
21:23:24.26 |
-08:30:17.7 |
HIP 105734 |
30.04 |
| 2026-08-18 12:00 |
21:23:00.50 |
-08:31:53.5 |
HIP 105424 |
30.30 |
| 2026-08-19 00:00 |
21:22:36.76 |
-08:33:29.8 |
HIP 105424 |
26.52 |