메타데이터
| 항목 |
값 |
| Designation |
C/2020 H4 (Leonard) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-29T06:41:40.873920Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:15Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-04-21T11:20:52.512000Z |
| Discovery magnitude (MPC) |
19.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-04-30.0000000 |
| e |
0.99234750 |
| q (au) |
0.937676 |
| a (au) |
122.531978 |
| i (deg) |
84.325459 |
| Ω (om, deg) |
307.763404 |
| ω (w, deg) |
116.826499 |
| M (ma, deg) |
359.911872 |
밝기
산란 + 전체 선형
$$
M_a = (12.688 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.688 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.988 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
07:02:40.30 |
-67:08:28.9 |
HIP 33993 |
15.43 |
| 2026-07-29 12:00 |
07:02:55.72 |
-67:09:15.8 |
HIP 33993 |
15.98 |
| 2026-07-30 00:00 |
07:03:11.09 |
-67:10:03.4 |
HIP 33993 |
16.70 |
| 2026-07-30 12:00 |
07:03:26.41 |
-67:10:51.6 |
HIP 33993 |
17.56 |
| 2026-07-31 00:00 |
07:03:41.69 |
-67:11:40.5 |
HIP 33993 |
18.55 |
| 2026-07-31 12:00 |
07:03:56.93 |
-67:12:30.2 |
HIP 33993 |
19.65 |
| 2026-08-01 00:00 |
07:04:12.12 |
-67:13:20.4 |
HIP 34308 |
19.52 |
| 2026-08-01 12:00 |
07:04:27.26 |
-67:14:11.4 |
HIP 34308 |
18.98 |
| 2026-08-02 00:00 |
07:04:42.36 |
-67:15:03.0 |
HIP 34308 |
18.60 |
| 2026-08-02 12:00 |
07:04:57.40 |
-67:15:55.3 |
HIP 34308 |
18.38 |
| 2026-08-03 00:00 |
07:05:12.40 |
-67:16:48.3 |
HIP 34308 |
18.33 |
| 2026-08-03 12:00 |
07:05:27.35 |
-67:17:41.9 |
HIP 34308 |
18.45 |
| 2026-08-04 00:00 |
07:05:42.25 |
-67:18:36.2 |
HIP 34308 |
18.73 |
| 2026-08-04 12:00 |
07:05:57.10 |
-67:19:31.2 |
HIP 34308 |
19.18 |
| 2026-08-05 00:00 |
07:06:11.89 |
-67:20:26.8 |
HIP 34308 |
19.78 |
| 2026-08-05 12:00 |
07:06:26.63 |
-67:21:23.1 |
HIP 34308 |
20.51 |
| 2026-08-06 00:00 |
07:06:41.32 |
-67:22:20.0 |
HIP 34308 |
21.37 |
| 2026-08-06 12:00 |
07:06:55.95 |
-67:23:17.6 |
HIP 34308 |
22.34 |
| 2026-08-07 00:00 |
07:07:10.53 |
-67:24:15.8 |
HIP 34308 |
23.40 |
| 2026-08-07 12:00 |
07:07:25.05 |
-67:25:14.7 |
HIP 34308 |
24.55 |
| 2026-08-08 00:00 |
07:07:39.51 |
-67:26:14.2 |
HIP 34308 |
25.76 |
| 2026-08-08 12:00 |
07:07:53.92 |
-67:27:14.4 |
HIP 34308 |
27.05 |
| 2026-08-09 00:00 |
07:08:08.26 |
-67:28:15.2 |
HIP 34712 |
27.95 |
| 2026-08-09 12:00 |
07:08:22.55 |
-67:29:16.7 |
HIP 34386 |
27.14 |
| 2026-08-10 00:00 |
07:08:36.78 |
-67:30:18.8 |
HIP 34386 |
26.33 |
| 2026-08-10 12:00 |
07:08:50.94 |
-67:31:21.6 |
HIP 34805 |
25.05 |
| 2026-08-11 00:00 |
07:09:05.04 |
-67:32:24.9 |
HIP 34805 |
23.34 |
| 2026-08-11 12:00 |
07:09:19.08 |
-67:33:28.9 |
HIP 34805 |
21.62 |
| 2026-08-12 00:00 |
07:09:33.05 |
-67:34:33.6 |
HIP 34805 |
19.91 |
| 2026-08-12 12:00 |
07:09:46.95 |
-67:35:38.8 |
HIP 34805 |
18.20 |
| 2026-08-13 00:00 |
07:10:00.79 |
-67:36:44.7 |
HIP 34805 |
16.48 |
| 2026-08-13 12:00 |
07:10:14.57 |
-67:37:51.2 |
HIP 34805 |
14.77 |
| 2026-08-14 00:00 |
07:10:28.27 |
-67:38:58.3 |
HIP 34805 |
13.05 |
| 2026-08-14 12:00 |
07:10:41.90 |
-67:40:06.0 |
HIP 34805 |
11.34 |
| 2026-08-15 00:00 |
07:10:55.47 |
-67:41:14.3 |
HIP 34805 |
9.62 |
| 2026-08-15 12:00 |
07:11:08.96 |
-67:42:23.2 |
HIP 34805 |
7.91 |
| 2026-08-16 00:00 |
07:11:22.38 |
-67:43:32.8 |
HIP 34805 |
6.21 |
| 2026-08-16 12:00 |
07:11:35.73 |
-67:44:42.9 |
HIP 34805 |
4.52 |
| 2026-08-17 00:00 |
07:11:49.00 |
-67:45:53.6 |
HIP 34805 |
2.87 |
| 2026-08-17 12:00 |
07:12:02.20 |
-67:47:04.9 |
HIP 34805 |
1.44 |
| 2026-08-18 00:00 |
07:12:15.33 |
-67:48:16.8 |
HIP 34805 |
1.36 |
| 2026-08-18 12:00 |
07:12:28.37 |
-67:49:29.2 |
HIP 34805 |
2.76 |
| 2026-08-19 00:00 |
07:12:41.34 |
-67:50:42.3 |
HIP 34805 |
4.40 |