메타데이터
| 항목 |
값 |
| Designation |
P/2020 B4 (Sheppard) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-11-25T07:31:50.350080Z |
| Orbit solution date (soln_date, UTC) |
2023-05-18T19:13:12Z |
| Obs used |
20 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
13.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-01-26T04:22:00.480000Z |
| Discovery magnitude (MPC) |
22.50 r |
| Discovery observatory (MPC) |
807 · Cerro Tololo Observatory, La Serena |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-06-04.0000000 |
| e |
0.19253094 |
| q (au) |
6.438946 |
| a (au) |
7.974232 |
| i (deg) |
11.601007 |
| Ω (om, deg) |
186.003502 |
| ω (w, deg) |
342.456738 |
| M (ma, deg) |
336.394550 |
밝기
산란 + 전체 선형
$$
M_a = (6.184 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.184 |
| n |
6.000 |
| gf |
0.935 |
| gb |
-0.981 |
| k |
1.000 |
| δ90 |
7.586 |
| 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) |
| 2026-05-12 00:00 |
17:43:03.70 |
-10:46:02.4 |
HIP 86702 |
2.72 |
| 2026-05-12 12:00 |
17:42:55.83 |
-10:45:24.3 |
HIP 86702 |
2.29 |
| 2026-05-13 00:00 |
17:42:47.88 |
-10:44:46.4 |
HIP 86702 |
3.38 |
| 2026-05-13 12:00 |
17:42:39.83 |
-10:44:08.8 |
HIP 86702 |
5.12 |
| 2026-05-14 00:00 |
17:42:31.69 |
-10:43:31.5 |
HIP 86702 |
7.05 |
| 2026-05-14 12:00 |
17:42:23.46 |
-10:42:54.6 |
HIP 86702 |
9.08 |
| 2026-05-15 00:00 |
17:42:15.14 |
-10:42:17.9 |
HIP 86702 |
11.15 |
| 2026-05-15 12:00 |
17:42:06.74 |
-10:41:41.6 |
HIP 86702 |
13.26 |
| 2026-05-16 00:00 |
17:41:58.25 |
-10:41:05.6 |
HIP 86702 |
15.39 |
| 2026-05-16 12:00 |
17:41:49.67 |
-10:40:29.9 |
HIP 86702 |
17.55 |
| 2026-05-17 00:00 |
17:41:41.02 |
-10:39:54.5 |
HIP 86702 |
19.74 |
| 2026-05-17 12:00 |
17:41:32.28 |
-10:39:19.5 |
HIP 86702 |
21.94 |
| 2026-05-18 00:00 |
17:41:23.46 |
-10:38:44.8 |
HIP 86702 |
24.17 |
| 2026-05-18 12:00 |
17:41:14.56 |
-10:38:10.4 |
HIP 86702 |
26.41 |
| 2026-05-19 00:00 |
17:41:05.59 |
-10:37:36.4 |
HIP 86702 |
28.68 |
| 2026-05-19 12:00 |
17:40:56.54 |
-10:37:02.7 |
HIP 86702 |
30.96 |
| 2026-05-20 00:00 |
17:40:47.41 |
-10:36:29.4 |
HIP 86370 |
32.24 |
| 2026-05-20 12:00 |
17:40:38.21 |
-10:35:56.4 |
HIP 86370 |
30.63 |
| 2026-05-21 00:00 |
17:40:28.94 |
-10:35:23.8 |
HIP 86370 |
29.11 |
| 2026-05-21 12:00 |
17:40:19.60 |
-10:34:51.5 |
HIP 86370 |
27.68 |
| 2026-05-22 00:00 |
17:40:10.19 |
-10:34:19.6 |
HIP 86370 |
26.37 |
| 2026-05-22 12:00 |
17:40:00.71 |
-10:33:48.1 |
HIP 86370 |
25.20 |
| 2026-05-23 00:00 |
17:39:51.16 |
-10:33:16.9 |
HIP 86370 |
24.20 |
| 2026-05-23 12:00 |
17:39:41.55 |
-10:32:46.1 |
HIP 86370 |
23.38 |
| 2026-05-24 00:00 |
17:39:31.87 |
-10:32:15.7 |
HIP 86370 |
22.79 |
| 2026-05-24 12:00 |
17:39:22.13 |
-10:31:45.6 |
HIP 86370 |
22.43 |
| 2026-05-25 00:00 |
17:39:12.33 |
-10:31:16.0 |
HIP 86370 |
22.32 |
| 2026-05-25 12:00 |
17:39:02.47 |
-10:30:46.7 |
HIP 86370 |
22.48 |
| 2026-05-26 00:00 |
17:38:52.56 |
-10:30:17.7 |
HIP 86370 |
22.90 |
| 2026-05-26 12:00 |
17:38:42.58 |
-10:29:49.2 |
HIP 86370 |
23.57 |
| 2026-05-27 00:00 |
17:38:32.55 |
-10:29:21.1 |
HIP 86370 |
24.47 |
| 2026-05-27 12:00 |
17:38:22.47 |
-10:28:53.3 |
HIP 86370 |
25.59 |
| 2026-05-28 00:00 |
17:38:12.33 |
-10:28:25.9 |
HIP 86370 |
26.89 |
| 2026-05-28 12:00 |
17:38:02.14 |
-10:27:59.0 |
HIP 86313 |
27.65 |
| 2026-05-29 00:00 |
17:37:51.90 |
-10:27:32.4 |
HIP 86313 |
28.37 |
| 2026-05-29 12:00 |
17:37:41.61 |
-10:27:06.2 |
HIP 86313 |
29.28 |
| 2026-05-30 00:00 |
17:37:31.28 |
-10:26:40.5 |
HIP 86313 |
30.39 |
| 2026-05-30 12:00 |
17:37:20.89 |
-10:26:15.1 |
HIP 86313 |
31.66 |
| 2026-05-31 00:00 |
17:37:10.47 |
-10:25:50.1 |
HIP 86313 |
33.09 |
| 2026-05-31 12:00 |
17:37:00.00 |
-10:25:25.6 |
HIP 86313 |
34.65 |
| 2026-06-01 00:00 |
17:36:49.49 |
-10:25:01.4 |
HIP 86190 |
35.14 |
| 2026-06-01 12:00 |
17:36:38.93 |
-10:24:37.7 |
HIP 86190 |
34.71 |
| 2026-06-02 00:00 |
17:36:28.34 |
-10:24:14.4 |
HIP 86190 |
34.49 |