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) |
| 2026-05-12 00:00 |
07:39:40.65 |
+10:28:11.9 |
HIP 37435 |
29.20 |
| 2026-05-12 12:00 |
07:39:52.16 |
+10:28:30.2 |
HIP 37435 |
27.49 |
| 2026-05-13 00:00 |
07:40:03.77 |
+10:28:48.0 |
HIP 37435 |
25.96 |
| 2026-05-13 12:00 |
07:40:15.46 |
+10:29:05.2 |
HIP 37435 |
24.65 |
| 2026-05-14 00:00 |
07:40:27.24 |
+10:29:22.0 |
HIP 37435 |
23.61 |
| 2026-05-14 12:00 |
07:40:39.12 |
+10:29:38.2 |
HIP 37435 |
22.87 |
| 2026-05-15 00:00 |
07:40:51.08 |
+10:29:53.8 |
HIP 37518 |
20.78 |
| 2026-05-15 12:00 |
07:41:03.12 |
+10:30:09.0 |
HIP 37518 |
18.24 |
| 2026-05-16 00:00 |
07:41:15.26 |
+10:30:23.6 |
HIP 37518 |
15.84 |
| 2026-05-16 12:00 |
07:41:27.47 |
+10:30:37.7 |
HIP 37518 |
13.68 |
| 2026-05-17 00:00 |
07:41:39.78 |
+10:30:51.3 |
HIP 37518 |
11.88 |
| 2026-05-17 12:00 |
07:41:52.16 |
+10:31:04.4 |
HIP 37518 |
10.67 |
| 2026-05-18 00:00 |
07:42:04.63 |
+10:31:16.9 |
HIP 37518 |
10.27 |
| 2026-05-18 12:00 |
07:42:17.18 |
+10:31:28.9 |
HIP 37518 |
10.78 |
| 2026-05-19 00:00 |
07:42:29.82 |
+10:31:40.4 |
HIP 37518 |
12.10 |
| 2026-05-19 12:00 |
07:42:42.53 |
+10:31:51.4 |
HIP 37518 |
14.02 |
| 2026-05-20 00:00 |
07:42:55.33 |
+10:32:01.8 |
HIP 37518 |
16.34 |
| 2026-05-20 12:00 |
07:43:08.20 |
+10:32:11.7 |
HIP 37518 |
18.92 |
| 2026-05-21 00:00 |
07:43:21.15 |
+10:32:21.1 |
HIP 37518 |
21.68 |
| 2026-05-21 12:00 |
07:43:34.18 |
+10:32:30.0 |
HIP 37518 |
24.57 |
| 2026-05-22 00:00 |
07:43:47.29 |
+10:32:38.3 |
HIP 37518 |
27.54 |
| 2026-05-22 12:00 |
07:44:00.47 |
+10:32:46.1 |
HIP 37871 |
27.53 |
| 2026-05-23 00:00 |
07:44:13.72 |
+10:32:53.4 |
HIP 37871 |
24.52 |
| 2026-05-23 12:00 |
07:44:27.05 |
+10:33:00.2 |
HIP 37871 |
21.56 |
| 2026-05-24 00:00 |
07:44:40.46 |
+10:33:06.5 |
HIP 37871 |
18.69 |
| 2026-05-24 12:00 |
07:44:53.94 |
+10:33:12.2 |
HIP 37871 |
15.96 |
| 2026-05-25 00:00 |
07:45:07.49 |
+10:33:17.5 |
HIP 37871 |
13.48 |
| 2026-05-25 12:00 |
07:45:21.11 |
+10:33:22.2 |
HIP 37871 |
11.42 |
| 2026-05-26 00:00 |
07:45:34.80 |
+10:33:26.4 |
HIP 37871 |
10.07 |
| 2026-05-26 12:00 |
07:45:48.56 |
+10:33:30.0 |
HIP 37871 |
9.74 |
| 2026-05-27 00:00 |
07:46:02.39 |
+10:33:33.2 |
HIP 37871 |
10.55 |
| 2026-05-27 12:00 |
07:46:16.29 |
+10:33:35.9 |
HIP 37871 |
12.28 |
| 2026-05-28 00:00 |
07:46:30.26 |
+10:33:38.0 |
HIP 37921 |
12.93 |
| 2026-05-28 12:00 |
07:46:44.29 |
+10:33:39.6 |
HIP 37921 |
14.22 |
| 2026-05-29 00:00 |
07:46:58.39 |
+10:33:40.7 |
HIP 37921 |
16.17 |
| 2026-05-29 12:00 |
07:47:12.56 |
+10:33:41.3 |
HIP 37921 |
18.59 |
| 2026-05-30 00:00 |
07:47:26.79 |
+10:33:41.4 |
HIP 37921 |
21.32 |
| 2026-05-30 12:00 |
07:47:41.09 |
+10:33:41.0 |
HIP 37921 |
24.27 |
| 2026-05-31 00:00 |
07:47:55.45 |
+10:33:40.1 |
HIP 38153 |
22.89 |
| 2026-05-31 12:00 |
07:48:09.87 |
+10:33:38.7 |
HIP 38153 |
20.32 |
| 2026-06-01 00:00 |
07:48:24.35 |
+10:33:36.7 |
HIP 38153 |
18.07 |
| 2026-06-01 12:00 |
07:48:38.90 |
+10:33:34.3 |
HIP 38153 |
16.31 |
| 2026-06-02 00:00 |
07:48:53.51 |
+10:33:31.3 |
HIP 38153 |
15.19 |