메타데이터
| 항목 |
값 |
| Designation |
C/2019 F1 (ATLAS-Africano) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-06-22T19:03:30.551040Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:29Z |
| Obs used |
1964 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
5.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-03-29T10:03:21.600000Z |
| Discovery magnitude (MPC) |
18.40 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2020-10-21.0000000 |
| e |
1.00348898 |
| q (au) |
3.595914 |
| a (au) |
-1030.647736 |
| i (deg) |
54.175708 |
| Ω (om, deg) |
38.726260 |
| ω (w, deg) |
251.113825 |
| M (ma, deg) |
-0.007292 |
밝기
산란 + 전체 선형
$$
M_a = (8.031 + 2.895\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.031 |
| n |
2.895 |
| gf |
0.914 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-02-08 |
2019-10-14 |
+8.8747 |
-7.840 |
| 2019-10-14 |
2020-05-26 |
-6.5457 |
+4.593 |
| 2020-05-26 |
2021-06-18 |
-3.0290 |
+1.838 |
| 2021-06-27 |
2022-08-28 |
+0.5643 |
+0.081 |
| 2022-08-28 |
2022-12-25 |
-8.8752 |
+7.089 |
| 2022-12-25 |
2024-01-31 |
+9.9762 |
-7.455 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:39:15.76 |
+22:40:42.1 |
HIP 12257 |
33.56 |
| 2026-05-12 12:00 |
02:39:24.53 |
+22:41:43.9 |
HIP 12257 |
34.01 |
| 2026-05-13 00:00 |
02:39:33.29 |
+22:42:45.8 |
HIP 12257 |
34.59 |
| 2026-05-13 12:00 |
02:39:42.04 |
+22:43:47.7 |
HIP 12257 |
35.30 |
| 2026-05-14 00:00 |
02:39:50.77 |
+22:44:49.6 |
HIP 12257 |
36.15 |
| 2026-05-14 12:00 |
02:39:59.49 |
+22:45:51.5 |
HIP 12257 |
37.10 |
| 2026-05-15 00:00 |
02:40:08.20 |
+22:46:53.5 |
HIP 12556 |
37.41 |
| 2026-05-15 12:00 |
02:40:16.90 |
+22:47:55.5 |
HIP 12665 |
37.17 |
| 2026-05-16 00:00 |
02:40:25.58 |
+22:48:57.5 |
HIP 12665 |
34.92 |
| 2026-05-16 12:00 |
02:40:34.24 |
+22:49:59.6 |
HIP 12665 |
32.68 |
| 2026-05-17 00:00 |
02:40:42.90 |
+22:51:01.6 |
HIP 12665 |
30.44 |
| 2026-05-17 12:00 |
02:40:51.53 |
+22:52:03.7 |
HIP 12665 |
28.20 |
| 2026-05-18 00:00 |
02:41:00.15 |
+22:53:05.8 |
HIP 12665 |
25.97 |
| 2026-05-18 12:00 |
02:41:08.76 |
+22:54:07.8 |
HIP 12665 |
23.74 |
| 2026-05-19 00:00 |
02:41:17.34 |
+22:55:09.9 |
HIP 12665 |
21.51 |
| 2026-05-19 12:00 |
02:41:25.91 |
+22:56:12.0 |
HIP 12665 |
19.29 |
| 2026-05-20 00:00 |
02:41:34.46 |
+22:57:14.2 |
HIP 12665 |
17.08 |
| 2026-05-20 12:00 |
02:41:42.99 |
+22:58:16.3 |
HIP 12665 |
14.88 |
| 2026-05-21 00:00 |
02:41:51.50 |
+22:59:18.4 |
HIP 12665 |
12.69 |
| 2026-05-21 12:00 |
02:42:00.00 |
+23:00:20.5 |
HIP 12665 |
10.51 |
| 2026-05-22 00:00 |
02:42:08.47 |
+23:01:22.6 |
HIP 12665 |
8.35 |
| 2026-05-22 12:00 |
02:42:16.92 |
+23:02:24.7 |
HIP 12665 |
6.24 |
| 2026-05-23 00:00 |
02:42:25.36 |
+23:03:26.8 |
HIP 12665 |
4.22 |
| 2026-05-23 12:00 |
02:42:33.77 |
+23:04:28.9 |
HIP 12665 |
2.54 |
| 2026-05-24 00:00 |
02:42:42.15 |
+23:05:31.0 |
HIP 12665 |
2.16 |
| 2026-05-24 12:00 |
02:42:50.52 |
+23:06:33.0 |
HIP 12665 |
3.53 |
| 2026-05-25 00:00 |
02:42:58.86 |
+23:07:35.1 |
HIP 12665 |
5.45 |
| 2026-05-25 12:00 |
02:43:07.19 |
+23:08:37.1 |
HIP 12665 |
7.52 |
| 2026-05-26 00:00 |
02:43:15.48 |
+23:09:39.1 |
HIP 12665 |
9.62 |
| 2026-05-26 12:00 |
02:43:23.76 |
+23:10:41.1 |
HIP 12665 |
11.75 |
| 2026-05-27 00:00 |
02:43:32.01 |
+23:11:43.1 |
HIP 12665 |
13.88 |
| 2026-05-27 12:00 |
02:43:40.23 |
+23:12:45.1 |
HIP 12665 |
16.01 |
| 2026-05-28 00:00 |
02:43:48.43 |
+23:13:47.0 |
HIP 12830 |
17.82 |
| 2026-05-28 12:00 |
02:43:56.60 |
+23:14:48.9 |
HIP 12830 |
15.68 |
| 2026-05-29 00:00 |
02:44:04.75 |
+23:15:50.8 |
HIP 12830 |
13.54 |
| 2026-05-29 12:00 |
02:44:12.87 |
+23:16:52.7 |
HIP 12830 |
11.41 |
| 2026-05-30 00:00 |
02:44:20.97 |
+23:17:54.5 |
HIP 12830 |
9.29 |
| 2026-05-30 12:00 |
02:44:29.04 |
+23:18:56.3 |
HIP 12830 |
7.17 |
| 2026-05-31 00:00 |
02:44:37.08 |
+23:19:58.1 |
HIP 12830 |
5.06 |
| 2026-05-31 12:00 |
02:44:45.09 |
+23:20:59.8 |
HIP 12830 |
2.97 |
| 2026-06-01 00:00 |
02:44:53.07 |
+23:22:01.5 |
HIP 12830 |
0.93 |
| 2026-06-01 12:00 |
02:45:01.03 |
+23:23:03.2 |
HIP 12830 |
1.33 |
| 2026-06-02 00:00 |
02:45:08.96 |
+23:24:04.8 |
HIP 12830 |
3.38 |