420P/Hill
메타데이터
| 항목 |
값 |
| Designation |
420P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-06-29T08:33:30.939840Z |
| Orbit solution date (soln_date, UTC) |
2024-05-30T01:12:43Z |
| Obs used |
223 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2014-08-01.0000000 |
| e |
0.49432464 |
| q (au) |
2.787876 |
| a (au) |
5.513174 |
| i (deg) |
14.459998 |
| Ω (om, deg) |
174.032327 |
| ω (w, deg) |
157.611202 |
| M (ma, deg) |
141.513392 |
밝기
산란 + 전체 선형
$$
M_a = (14.775 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.775 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.856 |
| k |
0.999 |
| δ90 |
10.000 |
| 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) |
| 2026-02-03 00:00 |
07:41:24.30 |
+07:23:57.3 |
HIP 37558 |
16.98 |
| 2026-02-03 12:00 |
07:41:11.84 |
+07:25:03.9 |
HIP 37558 |
19.78 |
| 2026-02-04 00:00 |
07:40:59.44 |
+07:26:10.9 |
HIP 37558 |
22.70 |
| 2026-02-04 12:00 |
07:40:47.13 |
+07:27:18.1 |
HIP 37558 |
25.68 |
| 2026-02-05 00:00 |
07:40:34.88 |
+07:28:25.7 |
HIP 37328 |
25.08 |
| 2026-02-05 12:00 |
07:40:22.72 |
+07:29:33.5 |
HIP 37328 |
22.74 |
| 2026-02-06 00:00 |
07:40:10.63 |
+07:30:41.7 |
HIP 37328 |
20.65 |
| 2026-02-06 12:00 |
07:39:58.62 |
+07:31:50.1 |
HIP 37328 |
18.88 |
| 2026-02-07 00:00 |
07:39:46.70 |
+07:32:58.9 |
HIP 37328 |
17.50 |
| 2026-02-07 12:00 |
07:39:34.86 |
+07:34:07.9 |
HIP 37328 |
16.61 |
| 2026-02-08 00:00 |
07:39:23.10 |
+07:35:17.1 |
HIP 37264 |
14.94 |
| 2026-02-08 12:00 |
07:39:11.43 |
+07:36:26.6 |
HIP 37264 |
13.42 |
| 2026-02-09 00:00 |
07:38:59.85 |
+07:37:36.4 |
HIP 37264 |
12.49 |
| 2026-02-09 12:00 |
07:38:48.36 |
+07:38:46.4 |
HIP 37264 |
12.28 |
| 2026-02-10 00:00 |
07:38:36.96 |
+07:39:56.6 |
HIP 37264 |
12.81 |
| 2026-02-10 12:00 |
07:38:25.65 |
+07:41:07.0 |
HIP 37264 |
13.98 |
| 2026-02-11 00:00 |
07:38:14.44 |
+07:42:17.7 |
HIP 37264 |
15.64 |
| 2026-02-11 12:00 |
07:38:03.33 |
+07:43:28.5 |
HIP 37264 |
17.63 |
| 2026-02-12 00:00 |
07:37:52.31 |
+07:44:39.6 |
HIP 37232 |
19.72 |
| 2026-02-12 12:00 |
07:37:41.39 |
+07:45:50.8 |
HIP 37232 |
21.09 |
| 2026-02-13 00:00 |
07:37:30.57 |
+07:47:02.3 |
HIP 37232 |
22.73 |
| 2026-02-13 12:00 |
07:37:19.85 |
+07:48:13.9 |
HIP 37232 |
24.59 |
| 2026-02-14 00:00 |
07:37:09.23 |
+07:49:25.7 |
HIP 37232 |
26.61 |
| 2026-02-14 12:00 |
07:36:58.72 |
+07:50:37.6 |
HIP 36922 |
28.05 |
| 2026-02-15 00:00 |
07:36:48.31 |
+07:51:49.7 |
HIP 36922 |
26.71 |
| 2026-02-15 12:00 |
07:36:38.02 |
+07:53:01.9 |
HIP 36922 |
25.64 |
| 2026-02-16 00:00 |
07:36:27.83 |
+07:54:14.2 |
HIP 36922 |
24.86 |
| 2026-02-16 12:00 |
07:36:17.75 |
+07:55:26.7 |
HIP 36922 |
24.40 |
| 2026-02-17 00:00 |
07:36:07.78 |
+07:56:39.3 |
HIP 36922 |
24.26 |
| 2026-02-17 12:00 |
07:35:57.92 |
+07:57:52.0 |
HIP 36922 |
24.45 |
| 2026-02-18 00:00 |
07:35:48.18 |
+07:59:04.8 |
HIP 36922 |
24.94 |
| 2026-02-18 12:00 |
07:35:38.55 |
+08:00:17.7 |
HIP 36922 |
25.71 |
| 2026-02-19 00:00 |
07:35:29.04 |
+08:01:30.7 |
HIP 36922 |
26.73 |
| 2026-02-19 12:00 |
07:35:19.65 |
+08:02:43.7 |
HIP 36922 |
27.96 |
| 2026-02-20 00:00 |
07:35:10.37 |
+08:03:56.8 |
HIP 36911 |
27.14 |
| 2026-02-20 12:00 |
07:35:01.21 |
+08:05:10.0 |
HIP 36911 |
26.25 |
| 2026-02-21 00:00 |
07:34:52.18 |
+08:06:23.2 |
HIP 36911 |
25.57 |
| 2026-02-21 12:00 |
07:34:43.26 |
+08:07:36.5 |
HIP 36911 |
25.13 |
| 2026-02-22 00:00 |
07:34:34.47 |
+08:08:49.8 |
HIP 36911 |
24.92 |
| 2026-02-22 12:00 |
07:34:25.80 |
+08:10:03.1 |
HIP 36911 |
24.94 |
| 2026-02-23 00:00 |
07:34:17.26 |
+08:11:16.4 |
HIP 36675 |
24.58 |
| 2026-02-23 12:00 |
07:34:08.84 |
+08:12:29.8 |
HIP 36675 |
22.22 |
| 2026-02-24 00:00 |
07:34:00.54 |
+08:13:43.1 |
HIP 36675 |
19.90 |