P/2020 B4 (Sheppard)
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) |
| 2026-02-03 00:00 |
17:30:25.74 |
-13:02:30.7 |
HIP 85691 |
18.81 |
| 2026-02-03 12:00 |
17:30:40.50 |
-13:02:07.9 |
HIP 85691 |
18.71 |
| 2026-02-04 00:00 |
17:30:55.18 |
-13:01:44.7 |
HIP 85691 |
19.30 |
| 2026-02-04 12:00 |
17:31:09.78 |
-13:01:21.1 |
HIP 85691 |
20.52 |
| 2026-02-05 00:00 |
17:31:24.30 |
-13:00:57.1 |
HIP 85691 |
22.24 |
| 2026-02-05 12:00 |
17:31:38.74 |
-13:00:32.8 |
HIP 85691 |
24.36 |
| 2026-02-06 00:00 |
17:31:53.09 |
-13:00:08.1 |
HIP 85691 |
26.77 |
| 2026-02-06 12:00 |
17:32:07.36 |
-12:59:43.0 |
HIP 85809 |
28.35 |
| 2026-02-07 00:00 |
17:32:21.54 |
-12:59:17.6 |
HIP 85809 |
28.35 |
| 2026-02-07 12:00 |
17:32:35.64 |
-12:58:51.8 |
HIP 85809 |
28.76 |
| 2026-02-08 00:00 |
17:32:49.65 |
-12:58:25.7 |
HIP 85809 |
29.56 |
| 2026-02-08 12:00 |
17:33:03.58 |
-12:57:59.2 |
HIP 85809 |
30.72 |
| 2026-02-09 00:00 |
17:33:17.41 |
-12:57:32.3 |
HIP 85871 |
32.05 |
| 2026-02-09 12:00 |
17:33:31.16 |
-12:57:05.1 |
HIP 85871 |
33.33 |
| 2026-02-10 00:00 |
17:33:44.82 |
-12:56:37.6 |
HIP 85939 |
33.69 |
| 2026-02-10 12:00 |
17:33:58.40 |
-12:56:09.7 |
HIP 85939 |
34.17 |
| 2026-02-11 00:00 |
17:34:11.88 |
-12:55:41.4 |
HIP 85939 |
34.97 |
| 2026-02-11 12:00 |
17:34:25.27 |
-12:55:12.8 |
HIP 85939 |
36.05 |
| 2026-02-12 00:00 |
17:34:38.56 |
-12:54:43.9 |
HIP 86059 |
35.12 |
| 2026-02-12 12:00 |
17:34:51.77 |
-12:54:14.6 |
HIP 86059 |
33.93 |
| 2026-02-13 00:00 |
17:35:04.88 |
-12:53:45.0 |
HIP 86059 |
33.01 |
| 2026-02-13 12:00 |
17:35:17.90 |
-12:53:15.0 |
HIP 86059 |
32.38 |
| 2026-02-14 00:00 |
17:35:30.82 |
-12:52:44.7 |
HIP 86059 |
32.06 |
| 2026-02-14 12:00 |
17:35:43.65 |
-12:52:14.1 |
HIP 86059 |
32.05 |
| 2026-02-15 00:00 |
17:35:56.39 |
-12:51:43.1 |
HIP 86059 |
32.34 |
| 2026-02-15 12:00 |
17:36:09.02 |
-12:51:11.9 |
HIP 86059 |
32.91 |
| 2026-02-16 00:00 |
17:36:21.56 |
-12:50:40.2 |
HIP 86059 |
33.74 |
| 2026-02-16 12:00 |
17:36:34.00 |
-12:50:08.3 |
HIP 86059 |
34.82 |
| 2026-02-17 00:00 |
17:36:46.35 |
-12:49:36.1 |
HIP 86059 |
36.11 |
| 2026-02-17 12:00 |
17:36:58.59 |
-12:49:03.5 |
HIP 86338 |
35.47 |
| 2026-02-18 00:00 |
17:37:10.73 |
-12:48:30.6 |
HIP 86338 |
33.19 |
| 2026-02-18 12:00 |
17:37:22.78 |
-12:47:57.4 |
HIP 86338 |
31.04 |
| 2026-02-19 00:00 |
17:37:34.72 |
-12:47:23.9 |
HIP 86338 |
29.05 |
| 2026-02-19 12:00 |
17:37:46.56 |
-12:46:50.1 |
HIP 86338 |
27.24 |
| 2026-02-20 00:00 |
17:37:58.29 |
-12:46:15.9 |
HIP 86338 |
25.65 |
| 2026-02-20 12:00 |
17:38:09.93 |
-12:45:41.5 |
HIP 86338 |
24.31 |
| 2026-02-21 00:00 |
17:38:21.46 |
-12:45:06.8 |
HIP 86338 |
23.25 |
| 2026-02-21 12:00 |
17:38:32.88 |
-12:44:31.8 |
HIP 86338 |
22.51 |
| 2026-02-22 00:00 |
17:38:44.21 |
-12:43:56.5 |
HIP 86338 |
22.10 |
| 2026-02-22 12:00 |
17:38:55.42 |
-12:43:20.9 |
HIP 86338 |
22.04 |
| 2026-02-23 00:00 |
17:39:06.53 |
-12:42:45.0 |
HIP 86338 |
22.31 |
| 2026-02-23 12:00 |
17:39:17.54 |
-12:42:08.8 |
HIP 86338 |
22.91 |
| 2026-02-24 00:00 |
17:39:28.43 |
-12:41:32.3 |
HIP 86338 |
23.79 |