메타데이터
| 항목 |
값 |
| Designation |
C/2019 F2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-08T21:26:06.544320Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:31Z |
| Obs used |
683 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
24.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-03-26T07:21:56.332800Z |
| Discovery magnitude (MPC) |
17.58 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-05-07.0000000 |
| e |
0.86507120 |
| q (au) |
2.232882 |
| a (au) |
16.548594 |
| i (deg) |
19.188643 |
| Ω (om, deg) |
175.867930 |
| ω (w, deg) |
10.953986 |
| M (ma, deg) |
358.171475 |
밝기
산란 + 전체 선형
$$
M_a = (8.336 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.336 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2019-02-26 |
2019-04-23 |
+11.7951 |
-5.190 |
| 2019-04-23 |
2019-06-26 |
+19.2752 |
-8.502 |
| 2019-12-28 |
2020-07-20 |
+5.9715 |
-2.763 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
22:24:04.81 |
-02:54:17.1 |
HIP 110563 |
9.32 |
| 2026-03-26 12:00 |
22:24:11.73 |
-02:53:34.8 |
HIP 110563 |
9.40 |
| 2026-03-27 00:00 |
22:24:18.62 |
-02:52:52.6 |
HIP 110563 |
9.84 |
| 2026-03-27 12:00 |
22:24:25.48 |
-02:52:10.5 |
HIP 110563 |
10.58 |
| 2026-03-28 00:00 |
22:24:32.31 |
-02:51:28.5 |
HIP 110563 |
11.57 |
| 2026-03-28 12:00 |
22:24:39.11 |
-02:50:46.5 |
HIP 110563 |
12.74 |
| 2026-03-29 00:00 |
22:24:45.88 |
-02:50:04.6 |
HIP 110563 |
14.05 |
| 2026-03-29 12:00 |
22:24:52.62 |
-02:49:22.8 |
HIP 110563 |
15.46 |
| 2026-03-30 00:00 |
22:24:59.33 |
-02:48:41.1 |
HIP 110563 |
16.94 |
| 2026-03-30 12:00 |
22:25:06.00 |
-02:47:59.5 |
HIP 110753 |
17.11 |
| 2026-03-31 00:00 |
22:25:12.65 |
-02:47:17.9 |
HIP 110753 |
15.43 |
| 2026-03-31 12:00 |
22:25:19.26 |
-02:46:36.5 |
HIP 110753 |
13.80 |
| 2026-04-01 00:00 |
22:25:25.84 |
-02:45:55.1 |
HIP 110753 |
12.22 |
| 2026-04-01 12:00 |
22:25:32.38 |
-02:45:13.8 |
HIP 110753 |
10.71 |
| 2026-04-02 00:00 |
22:25:38.89 |
-02:44:32.6 |
HIP 110753 |
9.31 |
| 2026-04-02 12:00 |
22:25:45.37 |
-02:43:51.6 |
HIP 110753 |
8.05 |
| 2026-04-03 00:00 |
22:25:51.81 |
-02:43:10.6 |
HIP 110753 |
7.02 |
| 2026-04-03 12:00 |
22:25:58.22 |
-02:42:29.7 |
HIP 110753 |
6.31 |
| 2026-04-04 00:00 |
22:26:04.59 |
-02:41:48.9 |
HIP 110753 |
6.04 |
| 2026-04-04 12:00 |
22:26:10.93 |
-02:41:08.3 |
HIP 110753 |
6.25 |
| 2026-04-05 00:00 |
22:26:17.23 |
-02:40:27.7 |
HIP 110753 |
6.90 |
| 2026-04-05 12:00 |
22:26:23.50 |
-02:39:47.3 |
HIP 110753 |
7.87 |
| 2026-04-06 00:00 |
22:26:29.73 |
-02:39:07.0 |
HIP 110753 |
9.05 |
| 2026-04-06 12:00 |
22:26:35.93 |
-02:38:26.8 |
HIP 110753 |
10.37 |
| 2026-04-07 00:00 |
22:26:42.09 |
-02:37:46.7 |
HIP 110753 |
11.78 |
| 2026-04-07 12:00 |
22:26:48.21 |
-02:37:06.7 |
HIP 110753 |
13.24 |
| 2026-04-08 00:00 |
22:26:54.29 |
-02:36:26.9 |
HIP 110753 |
14.74 |
| 2026-04-08 12:00 |
22:27:00.34 |
-02:35:47.2 |
HIP 110753 |
16.26 |
| 2026-04-09 00:00 |
22:27:06.35 |
-02:35:07.6 |
HIP 110753 |
17.80 |
| 2026-04-09 12:00 |
22:27:12.32 |
-02:34:28.2 |
HIP 110753 |
19.34 |
| 2026-04-10 00:00 |
22:27:18.25 |
-02:33:48.9 |
HIP 110753 |
20.89 |
| 2026-04-10 12:00 |
22:27:24.14 |
-02:33:09.7 |
HIP 110955 |
22.35 |
| 2026-04-11 00:00 |
22:27:29.99 |
-02:32:30.7 |
HIP 110955 |
20.76 |
| 2026-04-11 12:00 |
22:27:35.81 |
-02:31:51.8 |
HIP 110955 |
19.17 |
| 2026-04-12 00:00 |
22:27:41.58 |
-02:31:13.1 |
HIP 110955 |
17.59 |
| 2026-04-12 12:00 |
22:27:47.31 |
-02:30:34.5 |
HIP 110955 |
16.03 |
| 2026-04-13 00:00 |
22:27:53.00 |
-02:29:56.1 |
HIP 110955 |
14.48 |
| 2026-04-13 12:00 |
22:27:58.65 |
-02:29:17.8 |
HIP 110955 |
12.93 |
| 2026-04-14 00:00 |
22:28:04.26 |
-02:28:39.7 |
HIP 110955 |
11.41 |
| 2026-04-14 12:00 |
22:28:09.83 |
-02:28:01.7 |
HIP 110955 |
9.89 |
| 2026-04-15 00:00 |
22:28:15.36 |
-02:27:24.0 |
HIP 110955 |
8.39 |
| 2026-04-15 12:00 |
22:28:20.84 |
-02:26:46.3 |
HIP 110955 |
6.91 |
| 2026-04-16 00:00 |
22:28:26.28 |
-02:26:08.9 |
HIP 110955 |
5.45 |