메타데이터
| 항목 |
값 |
| Designation |
C/2017 C1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-18T22:42:46.506240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:29Z |
| Obs used |
60 |
| NEO |
- |
| M1 |
18.100 |
| K1 |
8.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-03-06.0000000 |
| e |
0.92781552 |
| q (au) |
1.501755 |
| a (au) |
20.804403 |
| i (deg) |
65.752241 |
| Ω (om, deg) |
357.457191 |
| ω (w, deg) |
110.204316 |
| M (ma, deg) |
0.478338 |
밝기
산란 + 전체 선형
$$
M_a = (17.436 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.436 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.703 |
| 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) |
| 2026-06-01 00:00 |
09:30:09.25 |
-87:01:41.2 |
HIP 45816 |
11.08 |
| 2026-06-01 12:00 |
09:30:40.82 |
-87:00:24.8 |
HIP 45816 |
12.33 |
| 2026-06-02 00:00 |
09:31:12.79 |
-86:59:08.5 |
HIP 45816 |
13.60 |
| 2026-06-02 12:00 |
09:31:45.12 |
-86:57:52.4 |
HIP 45816 |
14.88 |
| 2026-06-03 00:00 |
09:32:17.83 |
-86:56:36.5 |
HIP 45816 |
16.18 |
| 2026-06-03 12:00 |
09:32:50.90 |
-86:55:20.7 |
HIP 45816 |
17.48 |
| 2026-06-04 00:00 |
09:33:24.33 |
-86:54:05.1 |
HIP 48620 |
17.39 |
| 2026-06-04 12:00 |
09:33:58.10 |
-86:52:49.7 |
HIP 48620 |
17.08 |
| 2026-06-05 00:00 |
09:34:32.20 |
-86:51:34.4 |
HIP 48620 |
16.86 |
| 2026-06-05 12:00 |
09:35:06.64 |
-86:50:19.3 |
HIP 48620 |
16.73 |
| 2026-06-06 00:00 |
09:35:41.39 |
-86:49:04.4 |
HIP 48620 |
16.69 |
| 2026-06-06 12:00 |
09:36:16.46 |
-86:47:49.6 |
HIP 48620 |
16.75 |
| 2026-06-07 00:00 |
09:36:51.84 |
-86:46:35.1 |
HIP 48620 |
16.91 |
| 2026-06-07 12:00 |
09:37:27.52 |
-86:45:20.7 |
HIP 48620 |
17.16 |
| 2026-06-08 00:00 |
09:38:03.50 |
-86:44:06.5 |
HIP 48620 |
17.49 |
| 2026-06-08 12:00 |
09:38:39.76 |
-86:42:52.5 |
HIP 48620 |
17.91 |
| 2026-06-09 00:00 |
09:39:16.30 |
-86:41:38.7 |
HIP 48620 |
18.40 |
| 2026-06-09 12:00 |
09:39:53.13 |
-86:40:25.1 |
HIP 48620 |
18.97 |
| 2026-06-10 00:00 |
09:40:30.22 |
-86:39:11.7 |
HIP 48620 |
19.60 |
| 2026-06-10 12:00 |
09:41:07.57 |
-86:37:58.5 |
HIP 48620 |
20.29 |
| 2026-06-11 00:00 |
09:41:45.19 |
-86:36:45.5 |
HIP 48620 |
21.04 |
| 2026-06-11 12:00 |
09:42:23.06 |
-86:35:32.7 |
HIP 48620 |
21.83 |
| 2026-06-12 00:00 |
09:43:01.18 |
-86:34:20.1 |
HIP 48620 |
22.66 |
| 2026-06-12 12:00 |
09:43:39.54 |
-86:33:07.7 |
HIP 48620 |
23.53 |
| 2026-06-13 00:00 |
09:44:18.14 |
-86:31:55.5 |
HIP 48620 |
24.43 |
| 2026-06-13 12:00 |
09:44:56.97 |
-86:30:43.6 |
HIP 48620 |
25.37 |
| 2026-06-14 00:00 |
09:45:36.03 |
-86:29:31.8 |
HIP 48620 |
26.33 |
| 2026-06-14 12:00 |
09:46:15.31 |
-86:28:20.3 |
HIP 48620 |
27.32 |
| 2026-06-15 00:00 |
09:46:54.81 |
-86:27:09.0 |
HIP 48620 |
28.32 |
| 2026-06-15 12:00 |
09:47:34.53 |
-86:25:58.0 |
HIP 46892 |
29.01 |
| 2026-06-16 00:00 |
09:48:14.45 |
-86:24:47.2 |
HIP 46892 |
28.34 |
| 2026-06-16 12:00 |
09:48:54.57 |
-86:23:36.6 |
HIP 46892 |
27.73 |
| 2026-06-17 00:00 |
09:49:34.90 |
-86:22:26.2 |
HIP 48976 |
27.05 |
| 2026-06-17 12:00 |
09:50:15.42 |
-86:21:16.1 |
HIP 48976 |
25.73 |
| 2026-06-18 00:00 |
09:50:56.12 |
-86:20:06.2 |
HIP 48976 |
24.40 |
| 2026-06-18 12:00 |
09:51:37.02 |
-86:18:56.6 |
HIP 48976 |
23.08 |
| 2026-06-19 00:00 |
09:52:18.09 |
-86:17:47.2 |
HIP 48976 |
21.77 |
| 2026-06-19 12:00 |
09:52:59.34 |
-86:16:38.0 |
HIP 48976 |
20.46 |
| 2026-06-20 00:00 |
09:53:40.77 |
-86:15:29.1 |
HIP 48976 |
19.15 |
| 2026-06-20 12:00 |
09:54:22.36 |
-86:14:20.5 |
HIP 48976 |
17.85 |
| 2026-06-21 00:00 |
09:55:04.11 |
-86:13:12.1 |
HIP 48976 |
16.56 |
| 2026-06-21 12:00 |
09:55:46.03 |
-86:12:04.0 |
HIP 48976 |
15.28 |
| 2026-06-22 00:00 |
09:56:28.11 |
-86:10:56.1 |
HIP 48976 |
14.02 |