메타데이터
| 항목 |
값 |
| Designation |
C/2019 H1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-04-27T17:40:42.101760Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:33Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-04-18T21:12:57.600000Z |
| Discovery magnitude (MPC) |
18.00 R |
| Discovery observatory (MPC) |
C51 · WISE |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2019-05-16.0000000 |
| e |
0.99219409 |
| q (au) |
1.844784 |
| a (au) |
236.331687 |
| i (deg) |
104.580185 |
| Ω (om, deg) |
269.186008 |
| ω (w, deg) |
19.282675 |
| M (ma, deg) |
0.004955 |
밝기
산란 + 전체 선형
$$
M_a = (17.164 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.164 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.518 |
| k |
0.800 |
| 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 |
06:07:06.23 |
+38:48:08.9 |
HIP 28947 |
18.54 |
| 2026-05-12 12:00 |
06:07:11.89 |
+38:47:43.7 |
HIP 28947 |
19.31 |
| 2026-05-13 00:00 |
06:07:17.59 |
+38:47:18.7 |
HIP 28947 |
20.11 |
| 2026-05-13 12:00 |
06:07:23.33 |
+38:46:53.8 |
HIP 28946 |
20.25 |
| 2026-05-14 00:00 |
06:07:29.10 |
+38:46:29.1 |
HIP 28946 |
20.45 |
| 2026-05-14 12:00 |
06:07:34.91 |
+38:46:04.5 |
HIP 28946 |
20.72 |
| 2026-05-15 00:00 |
06:07:40.75 |
+38:45:40.1 |
HIP 28946 |
21.06 |
| 2026-05-15 12:00 |
06:07:46.62 |
+38:45:15.9 |
HIP 28946 |
21.47 |
| 2026-05-16 00:00 |
06:07:52.54 |
+38:44:51.8 |
HIP 28946 |
21.94 |
| 2026-05-16 12:00 |
06:07:58.48 |
+38:44:27.8 |
HIP 28946 |
22.48 |
| 2026-05-17 00:00 |
06:08:04.46 |
+38:44:04.0 |
HIP 28946 |
23.08 |
| 2026-05-17 12:00 |
06:08:10.47 |
+38:43:40.4 |
HIP 28946 |
23.74 |
| 2026-05-18 00:00 |
06:08:16.51 |
+38:43:16.9 |
HIP 28946 |
24.45 |
| 2026-05-18 12:00 |
06:08:22.59 |
+38:42:53.6 |
HIP 28946 |
25.20 |
| 2026-05-19 00:00 |
06:08:28.70 |
+38:42:30.4 |
HIP 28946 |
26.00 |
| 2026-05-19 12:00 |
06:08:34.83 |
+38:42:07.4 |
HIP 28946 |
26.84 |
| 2026-05-20 00:00 |
06:08:41.00 |
+38:41:44.6 |
HIP 29204 |
26.16 |
| 2026-05-20 12:00 |
06:08:47.20 |
+38:41:21.9 |
HIP 29204 |
25.35 |
| 2026-05-21 00:00 |
06:08:53.43 |
+38:40:59.4 |
HIP 29204 |
24.58 |
| 2026-05-21 12:00 |
06:08:59.69 |
+38:40:37.0 |
HIP 29204 |
23.85 |
| 2026-05-22 00:00 |
06:09:05.97 |
+38:40:14.8 |
HIP 29204 |
23.17 |
| 2026-05-22 12:00 |
06:09:12.28 |
+38:39:52.7 |
HIP 29204 |
22.54 |
| 2026-05-23 00:00 |
06:09:18.62 |
+38:39:30.8 |
HIP 29204 |
21.98 |
| 2026-05-23 12:00 |
06:09:24.99 |
+38:39:09.1 |
HIP 29204 |
21.48 |
| 2026-05-24 00:00 |
06:09:31.39 |
+38:38:47.5 |
HIP 29204 |
21.05 |
| 2026-05-24 12:00 |
06:09:37.81 |
+38:38:26.1 |
HIP 29204 |
20.69 |
| 2026-05-25 00:00 |
06:09:44.25 |
+38:38:04.9 |
HIP 29204 |
20.42 |
| 2026-05-25 12:00 |
06:09:50.72 |
+38:37:43.8 |
HIP 29204 |
20.23 |
| 2026-05-26 00:00 |
06:09:57.22 |
+38:37:22.8 |
HIP 29204 |
20.13 |
| 2026-05-26 12:00 |
06:10:03.74 |
+38:37:02.1 |
HIP 29204 |
20.12 |
| 2026-05-27 00:00 |
06:10:10.29 |
+38:36:41.4 |
HIP 29204 |
20.20 |
| 2026-05-27 12:00 |
06:10:16.85 |
+38:36:21.0 |
HIP 29204 |
20.38 |
| 2026-05-28 00:00 |
06:10:23.44 |
+38:36:00.7 |
HIP 29204 |
20.64 |
| 2026-05-28 12:00 |
06:10:30.06 |
+38:35:40.6 |
HIP 29204 |
20.98 |
| 2026-05-29 00:00 |
06:10:36.69 |
+38:35:20.6 |
HIP 29204 |
21.41 |
| 2026-05-29 12:00 |
06:10:43.35 |
+38:35:00.8 |
HIP 29204 |
21.92 |
| 2026-05-30 00:00 |
06:10:50.03 |
+38:34:41.1 |
HIP 29452 |
21.69 |
| 2026-05-30 12:00 |
06:10:56.73 |
+38:34:21.6 |
HIP 29452 |
20.82 |
| 2026-05-31 00:00 |
06:11:03.45 |
+38:34:02.3 |
HIP 29452 |
20.00 |
| 2026-05-31 12:00 |
06:11:10.19 |
+38:33:43.2 |
HIP 29452 |
19.24 |
| 2026-06-01 00:00 |
06:11:16.95 |
+38:33:24.2 |
HIP 29452 |
18.53 |
| 2026-06-01 12:00 |
06:11:23.74 |
+38:33:05.3 |
HIP 29452 |
17.90 |
| 2026-06-02 00:00 |
06:11:30.53 |
+38:32:46.6 |
HIP 29452 |
17.35 |