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) |
| 2026-09-20 00:00 |
21:01:16.06 |
-10:15:42.7 |
HIP 103851 |
25.19 |
| 2026-09-20 12:00 |
21:01:02.69 |
-10:17:03.9 |
HIP 103659 |
24.53 |
| 2026-09-21 00:00 |
21:00:49.59 |
-10:18:24.2 |
HIP 103659 |
21.76 |
| 2026-09-21 12:00 |
21:00:36.78 |
-10:19:43.7 |
HIP 103659 |
19.25 |
| 2026-09-22 00:00 |
21:00:24.24 |
-10:21:02.4 |
HIP 103659 |
17.09 |
| 2026-09-22 12:00 |
21:00:11.98 |
-10:22:20.2 |
HIP 103659 |
15.38 |
| 2026-09-23 00:00 |
21:00:00.01 |
-10:23:37.2 |
HIP 103659 |
14.24 |
| 2026-09-23 12:00 |
20:59:48.32 |
-10:24:53.2 |
HIP 103659 |
13.75 |
| 2026-09-24 00:00 |
20:59:36.92 |
-10:26:08.4 |
HIP 103659 |
13.95 |
| 2026-09-24 12:00 |
20:59:25.80 |
-10:27:22.6 |
HIP 103659 |
14.75 |
| 2026-09-25 00:00 |
20:59:14.97 |
-10:28:35.9 |
HIP 103581 |
14.22 |
| 2026-09-25 12:00 |
20:59:04.44 |
-10:29:48.3 |
HIP 103581 |
13.25 |
| 2026-09-26 00:00 |
20:58:54.19 |
-10:30:59.7 |
HIP 103581 |
12.83 |
| 2026-09-26 12:00 |
20:58:44.24 |
-10:32:10.2 |
HIP 103581 |
12.98 |
| 2026-09-27 00:00 |
20:58:34.58 |
-10:33:19.8 |
HIP 103581 |
13.64 |
| 2026-09-27 12:00 |
20:58:25.22 |
-10:34:28.4 |
HIP 103581 |
14.70 |
| 2026-09-28 00:00 |
20:58:16.15 |
-10:35:35.9 |
HIP 103581 |
16.04 |
| 2026-09-28 12:00 |
20:58:07.39 |
-10:36:42.6 |
HIP 103581 |
17.57 |
| 2026-09-29 00:00 |
20:57:58.92 |
-10:37:48.2 |
HIP 103581 |
19.22 |
| 2026-09-29 12:00 |
20:57:50.75 |
-10:38:52.8 |
HIP 103388 |
19.89 |
| 2026-09-30 00:00 |
20:57:42.88 |
-10:39:56.4 |
HIP 103388 |
19.11 |
| 2026-09-30 12:00 |
20:57:35.32 |
-10:40:58.9 |
HIP 103388 |
18.60 |
| 2026-10-01 00:00 |
20:57:28.06 |
-10:42:00.5 |
HIP 103388 |
18.35 |
| 2026-10-01 12:00 |
20:57:21.10 |
-10:43:01.0 |
HIP 103388 |
18.34 |
| 2026-10-02 00:00 |
20:57:14.45 |
-10:44:00.4 |
HIP 103388 |
18.56 |
| 2026-10-02 12:00 |
20:57:08.10 |
-10:44:58.8 |
HIP 103388 |
18.98 |
| 2026-10-03 00:00 |
20:57:02.07 |
-10:45:56.2 |
HIP 103388 |
19.56 |
| 2026-10-03 12:00 |
20:56:56.34 |
-10:46:52.4 |
HIP 103388 |
20.27 |
| 2026-10-04 00:00 |
20:56:50.91 |
-10:47:47.6 |
HIP 103388 |
21.07 |
| 2026-10-04 12:00 |
20:56:45.80 |
-10:48:41.7 |
HIP 103388 |
21.95 |
| 2026-10-05 00:00 |
20:56:41.00 |
-10:49:34.7 |
HIP 103388 |
22.87 |
| 2026-10-05 12:00 |
20:56:36.51 |
-10:50:26.5 |
HIP 103388 |
23.82 |
| 2026-10-06 00:00 |
20:56:32.34 |
-10:51:17.3 |
HIP 103388 |
24.79 |
| 2026-10-06 12:00 |
20:56:28.47 |
-10:52:06.9 |
HIP 103388 |
25.76 |
| 2026-10-07 00:00 |
20:56:24.92 |
-10:52:55.4 |
HIP 103388 |
26.71 |
| 2026-10-07 12:00 |
20:56:21.68 |
-10:53:42.8 |
HIP 103388 |
27.65 |
| 2026-10-08 00:00 |
20:56:18.76 |
-10:54:29.0 |
HIP 103280 |
27.78 |
| 2026-10-08 12:00 |
20:56:16.15 |
-10:55:14.0 |
HIP 103280 |
26.82 |
| 2026-10-09 00:00 |
20:56:13.85 |
-10:55:57.9 |
HIP 103280 |
25.91 |
| 2026-10-09 12:00 |
20:56:11.87 |
-10:56:40.6 |
HIP 103280 |
25.05 |
| 2026-10-10 00:00 |
20:56:10.21 |
-10:57:22.1 |
HIP 103280 |
24.25 |
| 2026-10-10 12:00 |
20:56:08.86 |
-10:58:02.4 |
HIP 103280 |
23.50 |
| 2026-10-11 00:00 |
20:56:07.83 |
-10:58:41.5 |
HIP 103280 |
22.80 |