메타데이터
| 항목 |
값 |
| 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 |
Osculating 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
21:45:40.23 |
-09:15:37.5 |
HIP 107487 |
8.94 |
| 2026-05-12 12:00 |
21:45:54.30 |
-09:13:40.7 |
HIP 107487 |
6.13 |
| 2026-05-13 00:00 |
21:46:08.21 |
-09:11:44.5 |
HIP 107487 |
5.21 |
| 2026-05-13 12:00 |
21:46:21.94 |
-09:09:49.0 |
HIP 107487 |
6.89 |
| 2026-05-14 00:00 |
21:46:35.50 |
-09:07:54.1 |
HIP 107487 |
9.87 |
| 2026-05-14 12:00 |
21:46:48.89 |
-09:05:59.8 |
HIP 107487 |
13.28 |
| 2026-05-15 00:00 |
21:47:02.09 |
-09:04:06.2 |
HIP 107487 |
16.82 |
| 2026-05-15 12:00 |
21:47:15.13 |
-09:02:13.3 |
HIP 107487 |
20.41 |
| 2026-05-16 00:00 |
21:47:27.98 |
-09:00:21.0 |
HIP 107487 |
24.00 |
| 2026-05-16 12:00 |
21:47:40.65 |
-08:58:29.4 |
HIP 107487 |
27.57 |
| 2026-05-17 00:00 |
21:47:53.14 |
-08:56:38.6 |
HIP 107487 |
31.12 |
| 2026-05-17 12:00 |
21:48:05.45 |
-08:54:48.4 |
HIP 107539 |
32.23 |
| 2026-05-18 00:00 |
21:48:17.58 |
-08:52:58.9 |
HIP 107539 |
32.60 |
| 2026-05-18 12:00 |
21:48:29.52 |
-08:51:10.1 |
HIP 107820 |
32.05 |
| 2026-05-19 00:00 |
21:48:41.27 |
-08:49:22.1 |
HIP 107820 |
29.77 |
| 2026-05-19 12:00 |
21:48:52.84 |
-08:47:34.8 |
HIP 107820 |
27.77 |
| 2026-05-20 00:00 |
21:49:04.23 |
-08:45:48.3 |
HIP 107820 |
26.08 |
| 2026-05-20 12:00 |
21:49:15.42 |
-08:44:02.5 |
HIP 107820 |
24.75 |
| 2026-05-21 00:00 |
21:49:26.42 |
-08:42:17.4 |
HIP 107743 |
23.63 |
| 2026-05-21 12:00 |
21:49:37.24 |
-08:40:33.1 |
HIP 107743 |
21.85 |
| 2026-05-22 00:00 |
21:49:47.86 |
-08:38:49.6 |
HIP 107743 |
20.42 |
| 2026-05-22 12:00 |
21:49:58.29 |
-08:37:06.9 |
HIP 107743 |
19.40 |
| 2026-05-23 00:00 |
21:50:08.53 |
-08:35:25.0 |
HIP 107743 |
18.82 |
| 2026-05-23 12:00 |
21:50:18.57 |
-08:33:43.8 |
HIP 107743 |
18.71 |
| 2026-05-24 00:00 |
21:50:28.42 |
-08:32:03.5 |
HIP 107743 |
19.05 |
| 2026-05-24 12:00 |
21:50:38.07 |
-08:30:24.0 |
HIP 107743 |
19.81 |
| 2026-05-25 00:00 |
21:50:47.53 |
-08:28:45.2 |
HIP 107743 |
20.90 |
| 2026-05-25 12:00 |
21:50:56.78 |
-08:27:07.4 |
HIP 107743 |
22.27 |
| 2026-05-26 00:00 |
21:51:05.84 |
-08:25:30.3 |
HIP 107959 |
19.92 |
| 2026-05-26 12:00 |
21:51:14.70 |
-08:23:54.1 |
HIP 107959 |
17.31 |
| 2026-05-27 00:00 |
21:51:23.35 |
-08:22:18.7 |
HIP 107959 |
14.78 |
| 2026-05-27 12:00 |
21:51:31.81 |
-08:20:44.2 |
HIP 107959 |
12.36 |
| 2026-05-28 00:00 |
21:51:40.06 |
-08:19:10.5 |
HIP 107959 |
10.09 |
| 2026-05-28 12:00 |
21:51:48.10 |
-08:17:37.7 |
HIP 107959 |
8.05 |
| 2026-05-29 00:00 |
21:51:55.95 |
-08:16:05.8 |
HIP 107959 |
6.42 |
| 2026-05-29 12:00 |
21:52:03.58 |
-08:14:34.8 |
HIP 107959 |
5.49 |
| 2026-05-30 00:00 |
21:52:11.01 |
-08:13:04.7 |
HIP 107959 |
5.55 |
| 2026-05-30 12:00 |
21:52:18.22 |
-08:11:35.5 |
HIP 107959 |
6.53 |
| 2026-05-31 00:00 |
21:52:25.23 |
-08:10:07.2 |
HIP 107959 |
8.06 |
| 2026-05-31 12:00 |
21:52:32.03 |
-08:08:39.8 |
HIP 107959 |
9.84 |
| 2026-06-01 00:00 |
21:52:38.62 |
-08:07:13.3 |
HIP 107959 |
11.75 |
| 2026-06-01 12:00 |
21:52:44.99 |
-08:05:47.8 |
HIP 107959 |
13.70 |
| 2026-06-02 00:00 |
21:52:51.15 |
-08:04:23.2 |
HIP 107959 |
15.65 |