메타데이터
| 항목 |
값 |
| Designation |
C/2019 B1 (Africano) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-03-19T22:08:42.066240Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:11Z |
| Obs used |
161 |
| NEO |
- |
| M1 |
17.400 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-19T11:27:31.680000Z |
| Discovery magnitude (MPC) |
17.80 G |
| Discovery observatory (MPC) |
703 · Catalina Sky Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-02-10.0000000 |
| e |
0.98972323 |
| q (au) |
1.597291 |
| a (au) |
155.427414 |
| i (deg) |
123.362586 |
| Ω (om, deg) |
290.432385 |
| ω (w, deg) |
174.882827 |
| M (ma, deg) |
359.980711 |
밝기
산란 + 전체 선형
$$
M_a = (16.811 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.811 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
0.983 |
| 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) |
| 2026-05-12 00:00 |
22:08:08.30 |
-44:44:52.1 |
HIP 109292 |
3.53 |
| 2026-05-12 12:00 |
22:08:08.76 |
-44:45:34.6 |
HIP 109292 |
3.79 |
| 2026-05-13 00:00 |
22:08:09.17 |
-44:46:17.5 |
HIP 109292 |
4.17 |
| 2026-05-13 12:00 |
22:08:09.50 |
-44:47:00.6 |
HIP 109292 |
4.64 |
| 2026-05-14 00:00 |
22:08:09.76 |
-44:47:44.1 |
HIP 109292 |
5.18 |
| 2026-05-14 12:00 |
22:08:09.96 |
-44:48:27.9 |
HIP 109292 |
5.77 |
| 2026-05-15 00:00 |
22:08:10.08 |
-44:49:12.0 |
HIP 109292 |
6.40 |
| 2026-05-15 12:00 |
22:08:10.14 |
-44:49:56.4 |
HIP 109292 |
7.06 |
| 2026-05-16 00:00 |
22:08:10.13 |
-44:50:41.0 |
HIP 109292 |
7.75 |
| 2026-05-16 12:00 |
22:08:10.05 |
-44:51:26.0 |
HIP 109292 |
8.45 |
| 2026-05-17 00:00 |
22:08:09.89 |
-44:52:11.3 |
HIP 109292 |
9.17 |
| 2026-05-17 12:00 |
22:08:09.67 |
-44:52:56.8 |
HIP 109292 |
9.90 |
| 2026-05-18 00:00 |
22:08:09.38 |
-44:53:42.7 |
HIP 109292 |
10.65 |
| 2026-05-18 12:00 |
22:08:09.02 |
-44:54:28.8 |
HIP 109292 |
11.40 |
| 2026-05-19 00:00 |
22:08:08.59 |
-44:55:15.2 |
HIP 109292 |
12.17 |
| 2026-05-19 12:00 |
22:08:08.09 |
-44:56:01.8 |
HIP 109292 |
12.94 |
| 2026-05-20 00:00 |
22:08:07.51 |
-44:56:48.7 |
HIP 109292 |
13.73 |
| 2026-05-20 12:00 |
22:08:06.87 |
-44:57:35.9 |
HIP 109292 |
14.52 |
| 2026-05-21 00:00 |
22:08:06.16 |
-44:58:23.4 |
HIP 109292 |
15.31 |
| 2026-05-21 12:00 |
22:08:05.37 |
-44:59:11.1 |
HIP 109292 |
16.12 |
| 2026-05-22 00:00 |
22:08:04.52 |
-44:59:59.0 |
HIP 109292 |
16.93 |
| 2026-05-22 12:00 |
22:08:03.59 |
-45:00:47.2 |
HIP 109292 |
17.75 |
| 2026-05-23 00:00 |
22:08:02.60 |
-45:01:35.7 |
HIP 109292 |
18.58 |
| 2026-05-23 12:00 |
22:08:01.53 |
-45:02:24.4 |
HIP 109292 |
19.41 |
| 2026-05-24 00:00 |
22:08:00.40 |
-45:03:13.3 |
HIP 109292 |
20.25 |
| 2026-05-24 12:00 |
22:07:59.19 |
-45:04:02.4 |
HIP 109292 |
21.10 |
| 2026-05-25 00:00 |
22:07:57.91 |
-45:04:51.8 |
HIP 109292 |
21.95 |
| 2026-05-25 12:00 |
22:07:56.56 |
-45:05:41.4 |
HIP 109166 |
21.72 |
| 2026-05-26 00:00 |
22:07:55.14 |
-45:06:31.2 |
HIP 109166 |
20.90 |
| 2026-05-26 12:00 |
22:07:53.65 |
-45:07:21.2 |
HIP 109166 |
20.07 |
| 2026-05-27 00:00 |
22:07:52.09 |
-45:08:11.5 |
HIP 109166 |
19.23 |
| 2026-05-27 12:00 |
22:07:50.46 |
-45:09:01.9 |
HIP 109166 |
18.39 |
| 2026-05-28 00:00 |
22:07:48.76 |
-45:09:52.6 |
HIP 109166 |
17.54 |
| 2026-05-28 12:00 |
22:07:46.98 |
-45:10:43.4 |
HIP 109166 |
16.69 |
| 2026-05-29 00:00 |
22:07:45.14 |
-45:11:34.5 |
HIP 109166 |
15.83 |
| 2026-05-29 12:00 |
22:07:43.23 |
-45:12:25.7 |
HIP 109166 |
14.97 |
| 2026-05-30 00:00 |
22:07:41.24 |
-45:13:17.1 |
HIP 109166 |
14.10 |
| 2026-05-30 12:00 |
22:07:39.18 |
-45:14:08.7 |
HIP 109166 |
13.23 |
| 2026-05-31 00:00 |
22:07:37.06 |
-45:15:00.5 |
HIP 109166 |
12.36 |
| 2026-05-31 12:00 |
22:07:34.86 |
-45:15:52.5 |
HIP 109166 |
11.49 |
| 2026-06-01 00:00 |
22:07:32.59 |
-45:16:44.6 |
HIP 109166 |
10.62 |
| 2026-06-01 12:00 |
22:07:30.25 |
-45:17:36.9 |
HIP 109166 |
9.76 |
| 2026-06-02 00:00 |
22:07:27.84 |
-45:18:29.4 |
HIP 109166 |
8.90 |