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) |
| 2026-07-29 00:00 |
08:20:37.38 |
+09:37:09.0 |
HIP 40879 |
13.29 |
| 2026-07-29 12:00 |
08:20:54.78 |
+09:36:16.2 |
HIP 40879 |
13.79 |
| 2026-07-30 00:00 |
08:21:12.17 |
+09:35:23.1 |
HIP 40879 |
15.54 |
| 2026-07-30 12:00 |
08:21:29.55 |
+09:34:29.7 |
HIP 40879 |
18.20 |
| 2026-07-31 00:00 |
08:21:46.92 |
+09:33:36.0 |
HIP 41064 |
15.63 |
| 2026-07-31 12:00 |
08:22:04.28 |
+09:32:42.0 |
HIP 41064 |
11.35 |
| 2026-08-01 00:00 |
08:22:21.62 |
+09:31:47.6 |
HIP 41064 |
7.18 |
| 2026-08-01 12:00 |
08:22:38.95 |
+09:30:52.9 |
HIP 41064 |
3.54 |
| 2026-08-02 00:00 |
08:22:56.27 |
+09:29:58.0 |
HIP 41064 |
3.41 |
| 2026-08-02 12:00 |
08:23:13.57 |
+09:29:02.7 |
HIP 41064 |
6.98 |
| 2026-08-03 00:00 |
08:23:30.86 |
+09:28:07.1 |
HIP 41064 |
11.13 |
| 2026-08-03 12:00 |
08:23:48.13 |
+09:27:11.2 |
HIP 41183 |
14.69 |
| 2026-08-04 00:00 |
08:24:05.38 |
+09:26:15.0 |
HIP 41183 |
12.46 |
| 2026-08-04 12:00 |
08:24:22.62 |
+09:25:18.6 |
HIP 41257 |
9.48 |
| 2026-08-05 00:00 |
08:24:39.85 |
+09:24:21.8 |
HIP 41257 |
5.37 |
| 2026-08-05 12:00 |
08:24:57.05 |
+09:23:24.7 |
HIP 41257 |
2.37 |
| 2026-08-06 00:00 |
08:25:14.24 |
+09:22:27.4 |
HIP 41257 |
4.49 |
| 2026-08-06 12:00 |
08:25:31.40 |
+09:21:29.7 |
HIP 41257 |
8.52 |
| 2026-08-07 00:00 |
08:25:48.55 |
+09:20:31.8 |
HIP 41257 |
12.75 |
| 2026-08-07 12:00 |
08:26:05.68 |
+09:19:33.6 |
HIP 41358 |
13.28 |
| 2026-08-08 00:00 |
08:26:22.79 |
+09:18:35.1 |
HIP 41358 |
14.10 |
| 2026-08-08 12:00 |
08:26:39.88 |
+09:17:36.3 |
HIP 41358 |
16.09 |
| 2026-08-09 00:00 |
08:26:56.94 |
+09:16:37.3 |
HIP 41358 |
18.89 |
| 2026-08-09 12:00 |
08:27:13.98 |
+09:15:38.0 |
HIP 41358 |
22.17 |
| 2026-08-10 00:00 |
08:27:31.00 |
+09:14:38.4 |
HIP 41358 |
25.77 |
| 2026-08-10 12:00 |
08:27:48.00 |
+09:13:38.5 |
HIP 41648 |
28.61 |
| 2026-08-11 00:00 |
08:28:04.97 |
+09:12:38.4 |
HIP 41648 |
25.43 |
| 2026-08-11 12:00 |
08:28:21.92 |
+09:11:38.0 |
HIP 41648 |
22.64 |
| 2026-08-12 00:00 |
08:28:38.84 |
+09:10:37.4 |
HIP 41648 |
20.39 |
| 2026-08-12 12:00 |
08:28:55.73 |
+09:09:36.5 |
HIP 41648 |
18.86 |
| 2026-08-13 00:00 |
08:29:12.60 |
+09:08:35.4 |
HIP 41648 |
18.24 |
| 2026-08-13 12:00 |
08:29:29.44 |
+09:07:34.0 |
HIP 41648 |
18.62 |
| 2026-08-14 00:00 |
08:29:46.25 |
+09:06:32.4 |
HIP 41648 |
19.94 |
| 2026-08-14 12:00 |
08:30:03.03 |
+09:05:30.5 |
HIP 41776 |
17.17 |
| 2026-08-15 00:00 |
08:30:19.78 |
+09:04:28.4 |
HIP 41776 |
13.95 |
| 2026-08-15 12:00 |
08:30:36.50 |
+09:03:26.1 |
HIP 41776 |
11.43 |
| 2026-08-16 00:00 |
08:30:53.19 |
+09:02:23.5 |
HIP 41776 |
10.15 |
| 2026-08-16 12:00 |
08:31:09.85 |
+09:01:20.7 |
HIP 41776 |
10.57 |
| 2026-08-17 00:00 |
08:31:26.48 |
+09:00:17.7 |
HIP 41776 |
12.51 |
| 2026-08-17 12:00 |
08:31:43.08 |
+08:59:14.5 |
HIP 41872 |
10.32 |
| 2026-08-18 00:00 |
08:31:59.64 |
+08:58:11.0 |
HIP 41872 |
6.61 |
| 2026-08-18 12:00 |
08:32:16.16 |
+08:57:07.4 |
HIP 41872 |
4.06 |
| 2026-08-19 00:00 |
08:32:32.66 |
+08:56:03.5 |
HIP 41872 |
4.98 |