메타데이터
| 항목 |
값 |
| Designation |
C/2019 L2 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-02T01:58:42.522240Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T02:26:14Z |
| Obs used |
117 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
27.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-11T18:48:21.312000Z |
| Discovery magnitude (MPC) |
18.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-07-05.0000000 |
| e |
0.93676409 |
| q (au) |
1.621540 |
| a (au) |
25.642708 |
| i (deg) |
152.187378 |
| Ω (om, deg) |
12.534296 |
| ω (w, deg) |
18.816880 |
| M (ma, deg) |
0.712861 |
밝기
산란 + 전체 선형
$$
M_a = (13.141 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.141 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:12:40.56 |
-02:59:29.1 |
HIP 64569 |
23.68 |
| 2026-07-29 12:00 |
13:12:41.69 |
-02:59:48.3 |
HIP 64569 |
23.58 |
| 2026-07-30 00:00 |
13:12:42.86 |
-03:00:07.8 |
HIP 64569 |
23.49 |
| 2026-07-30 12:00 |
13:12:44.09 |
-03:00:27.6 |
HIP 64569 |
23.39 |
| 2026-07-31 00:00 |
13:12:45.35 |
-03:00:47.6 |
HIP 64569 |
23.30 |
| 2026-07-31 12:00 |
13:12:46.67 |
-03:01:07.9 |
HIP 64569 |
23.20 |
| 2026-08-01 00:00 |
13:12:48.03 |
-03:01:28.4 |
HIP 64569 |
23.11 |
| 2026-08-01 12:00 |
13:12:49.44 |
-03:01:49.2 |
HIP 64569 |
23.02 |
| 2026-08-02 00:00 |
13:12:50.89 |
-03:02:10.2 |
HIP 64569 |
22.93 |
| 2026-08-02 12:00 |
13:12:52.39 |
-03:02:31.4 |
HIP 64569 |
22.85 |
| 2026-08-03 00:00 |
13:12:53.93 |
-03:02:52.9 |
HIP 64569 |
22.78 |
| 2026-08-03 12:00 |
13:12:55.52 |
-03:03:14.7 |
HIP 64569 |
22.71 |
| 2026-08-04 00:00 |
13:12:57.15 |
-03:03:36.6 |
HIP 64569 |
22.64 |
| 2026-08-04 12:00 |
13:12:58.83 |
-03:03:58.8 |
HIP 64569 |
22.59 |
| 2026-08-05 00:00 |
13:13:00.56 |
-03:04:21.3 |
HIP 64569 |
22.54 |
| 2026-08-05 12:00 |
13:13:02.32 |
-03:04:43.9 |
HIP 64569 |
22.50 |
| 2026-08-06 00:00 |
13:13:04.14 |
-03:05:06.8 |
HIP 64569 |
22.48 |
| 2026-08-06 12:00 |
13:13:05.99 |
-03:05:30.0 |
HIP 64569 |
22.46 |
| 2026-08-07 00:00 |
13:13:07.89 |
-03:05:53.3 |
HIP 64569 |
22.46 |
| 2026-08-07 12:00 |
13:13:09.84 |
-03:06:16.9 |
HIP 64569 |
22.47 |
| 2026-08-08 00:00 |
13:13:11.82 |
-03:06:40.7 |
HIP 64569 |
22.49 |
| 2026-08-08 12:00 |
13:13:13.85 |
-03:07:04.8 |
HIP 64569 |
22.53 |
| 2026-08-09 00:00 |
13:13:15.93 |
-03:07:29.0 |
HIP 64512 |
22.23 |
| 2026-08-09 12:00 |
13:13:18.05 |
-03:07:53.5 |
HIP 64512 |
21.80 |
| 2026-08-10 00:00 |
13:13:20.20 |
-03:08:18.2 |
HIP 64512 |
21.37 |
| 2026-08-10 12:00 |
13:13:22.41 |
-03:08:43.1 |
HIP 64512 |
20.96 |
| 2026-08-11 00:00 |
13:13:24.65 |
-03:09:08.3 |
HIP 64512 |
20.55 |
| 2026-08-11 12:00 |
13:13:26.94 |
-03:09:33.6 |
HIP 64512 |
20.16 |
| 2026-08-12 00:00 |
13:13:29.27 |
-03:09:59.2 |
HIP 64512 |
19.79 |
| 2026-08-12 12:00 |
13:13:31.64 |
-03:10:24.9 |
HIP 64512 |
19.43 |
| 2026-08-13 00:00 |
13:13:34.05 |
-03:10:50.9 |
HIP 64512 |
19.09 |
| 2026-08-13 12:00 |
13:13:36.50 |
-03:11:17.1 |
HIP 64512 |
18.78 |
| 2026-08-14 00:00 |
13:13:38.99 |
-03:11:43.4 |
HIP 64512 |
18.49 |
| 2026-08-14 12:00 |
13:13:41.52 |
-03:12:10.0 |
HIP 64512 |
18.22 |
| 2026-08-15 00:00 |
13:13:44.10 |
-03:12:36.8 |
HIP 64512 |
17.98 |
| 2026-08-15 12:00 |
13:13:46.71 |
-03:13:03.8 |
HIP 64512 |
17.78 |
| 2026-08-16 00:00 |
13:13:49.36 |
-03:13:30.9 |
HIP 64512 |
17.61 |
| 2026-08-16 12:00 |
13:13:52.06 |
-03:13:58.3 |
HIP 64512 |
17.48 |
| 2026-08-17 00:00 |
13:13:54.79 |
-03:14:25.9 |
HIP 64512 |
17.38 |
| 2026-08-17 12:00 |
13:13:57.56 |
-03:14:53.6 |
HIP 64512 |
17.33 |
| 2026-08-18 00:00 |
13:14:00.36 |
-03:15:21.5 |
HIP 64512 |
17.32 |
| 2026-08-18 12:00 |
13:14:03.21 |
-03:15:49.6 |
HIP 64512 |
17.35 |
| 2026-08-19 00:00 |
13:14:06.09 |
-03:16:17.9 |
HIP 64512 |
17.43 |