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) |
| 2026-03-26 00:00 |
06:01:55.02 |
+39:37:21.5 |
HIP 28410 |
22.12 |
| 2026-03-26 12:00 |
06:01:55.51 |
+39:36:45.4 |
HIP 28410 |
22.32 |
| 2026-03-27 00:00 |
06:01:56.06 |
+39:36:09.4 |
HIP 28410 |
22.54 |
| 2026-03-27 12:00 |
06:01:56.68 |
+39:35:33.4 |
HIP 28410 |
22.79 |
| 2026-03-28 00:00 |
06:01:57.38 |
+39:34:57.5 |
HIP 28410 |
23.06 |
| 2026-03-28 12:00 |
06:01:58.14 |
+39:34:21.6 |
HIP 28410 |
23.36 |
| 2026-03-29 00:00 |
06:01:58.97 |
+39:33:45.8 |
HIP 28410 |
23.69 |
| 2026-03-29 12:00 |
06:01:59.87 |
+39:33:10.1 |
HIP 28410 |
24.04 |
| 2026-03-30 00:00 |
06:02:00.84 |
+39:32:34.5 |
HIP 28410 |
24.41 |
| 2026-03-30 12:00 |
06:02:01.87 |
+39:31:58.9 |
HIP 28410 |
24.80 |
| 2026-03-31 00:00 |
06:02:02.98 |
+39:31:23.4 |
HIP 28410 |
25.22 |
| 2026-03-31 12:00 |
06:02:04.15 |
+39:30:48.0 |
HIP 28410 |
25.65 |
| 2026-04-01 00:00 |
06:02:05.39 |
+39:30:12.6 |
HIP 28410 |
26.10 |
| 2026-04-01 12:00 |
06:02:06.69 |
+39:29:37.3 |
HIP 28410 |
26.58 |
| 2026-04-02 00:00 |
06:02:08.07 |
+39:29:02.1 |
HIP 28410 |
27.07 |
| 2026-04-02 12:00 |
06:02:09.51 |
+39:28:27.0 |
HIP 28410 |
27.58 |
| 2026-04-03 00:00 |
06:02:11.01 |
+39:27:52.0 |
HIP 28410 |
28.10 |
| 2026-04-03 12:00 |
06:02:12.59 |
+39:27:17.0 |
HIP 28410 |
28.64 |
| 2026-04-04 00:00 |
06:02:14.23 |
+39:26:42.2 |
HIP 28410 |
29.20 |
| 2026-04-04 12:00 |
06:02:15.93 |
+39:26:07.4 |
HIP 28410 |
29.77 |
| 2026-04-05 00:00 |
06:02:17.70 |
+39:25:32.7 |
HIP 28410 |
30.35 |
| 2026-04-05 12:00 |
06:02:19.53 |
+39:24:58.1 |
HIP 28410 |
30.95 |
| 2026-04-06 00:00 |
06:02:21.43 |
+39:24:23.6 |
HIP 28410 |
31.56 |
| 2026-04-06 12:00 |
06:02:23.40 |
+39:23:49.2 |
HIP 28410 |
32.19 |
| 2026-04-07 00:00 |
06:02:25.42 |
+39:23:14.9 |
HIP 28410 |
32.82 |
| 2026-04-07 12:00 |
06:02:27.51 |
+39:22:40.6 |
HIP 28410 |
33.47 |
| 2026-04-08 00:00 |
06:02:29.67 |
+39:22:06.5 |
HIP 28853 |
34.05 |
| 2026-04-08 12:00 |
06:02:31.89 |
+39:21:32.5 |
HIP 28853 |
33.63 |
| 2026-04-09 00:00 |
06:02:34.17 |
+39:20:58.5 |
HIP 28853 |
33.21 |
| 2026-04-09 12:00 |
06:02:36.51 |
+39:20:24.7 |
HIP 28853 |
32.78 |
| 2026-04-10 00:00 |
06:02:38.92 |
+39:19:51.0 |
HIP 28853 |
32.36 |
| 2026-04-10 12:00 |
06:02:41.39 |
+39:19:17.3 |
HIP 28853 |
31.93 |
| 2026-04-11 00:00 |
06:02:43.92 |
+39:18:43.8 |
HIP 28853 |
31.50 |
| 2026-04-11 12:00 |
06:02:46.51 |
+39:18:10.4 |
HIP 28853 |
31.07 |
| 2026-04-12 00:00 |
06:02:49.16 |
+39:17:37.1 |
HIP 28853 |
30.64 |
| 2026-04-12 12:00 |
06:02:51.88 |
+39:17:03.9 |
HIP 28853 |
30.22 |
| 2026-04-13 00:00 |
06:02:54.65 |
+39:16:30.8 |
HIP 28853 |
29.79 |
| 2026-04-13 12:00 |
06:02:57.49 |
+39:15:57.8 |
HIP 28853 |
29.37 |
| 2026-04-14 00:00 |
06:03:00.39 |
+39:15:24.9 |
HIP 28853 |
28.94 |
| 2026-04-14 12:00 |
06:03:03.34 |
+39:14:52.1 |
HIP 28853 |
28.53 |
| 2026-04-15 00:00 |
06:03:06.36 |
+39:14:19.4 |
HIP 28853 |
28.11 |
| 2026-04-15 12:00 |
06:03:09.43 |
+39:13:46.9 |
HIP 28853 |
27.70 |
| 2026-04-16 00:00 |
06:03:12.56 |
+39:13:14.5 |
HIP 28853 |
27.30 |