메타데이터
| 항목 |
값 |
| Designation |
C/2016 U1 (NEOWISE) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-01-14T00:24:03.925440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:28Z |
| Obs used |
366 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
12.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2016-12-12.0000000 |
| e |
1.00025297 |
| q (au) |
0.319170 |
| a (au) |
-1261.677714 |
| i (deg) |
46.434833 |
| Ω (om, deg) |
61.428521 |
| ω (w, deg) |
162.748270 |
| M (ma, deg) |
-0.000726 |
밝기
산란 + 전체 선형
$$
M_a = (15.005 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.005 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.984 |
| k |
0.993 |
| δ90 |
9.928 |
| 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 |
| 2016-10-21 |
2017-01-12 |
-0.0100 |
-1.052 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:55:54.07 |
-04:52:24.5 |
HIP 13721 |
31.03 |
| 2026-05-12 12:00 |
02:55:58.54 |
-04:52:06.4 |
HIP 13827 |
30.87 |
| 2026-05-13 00:00 |
02:56:03.00 |
-04:51:48.5 |
HIP 13827 |
29.72 |
| 2026-05-13 12:00 |
02:56:07.46 |
-04:51:30.8 |
HIP 13827 |
28.57 |
| 2026-05-14 00:00 |
02:56:11.92 |
-04:51:13.4 |
HIP 13827 |
27.42 |
| 2026-05-14 12:00 |
02:56:16.37 |
-04:50:56.2 |
HIP 13827 |
26.28 |
| 2026-05-15 00:00 |
02:56:20.81 |
-04:50:39.2 |
HIP 13827 |
25.14 |
| 2026-05-15 12:00 |
02:56:25.25 |
-04:50:22.5 |
HIP 13827 |
24.00 |
| 2026-05-16 00:00 |
02:56:29.69 |
-04:50:06.0 |
HIP 13827 |
22.86 |
| 2026-05-16 12:00 |
02:56:34.12 |
-04:49:49.7 |
HIP 13827 |
21.73 |
| 2026-05-17 00:00 |
02:56:38.54 |
-04:49:33.7 |
HIP 13827 |
20.59 |
| 2026-05-17 12:00 |
02:56:42.96 |
-04:49:17.9 |
HIP 13827 |
19.46 |
| 2026-05-18 00:00 |
02:56:47.37 |
-04:49:02.3 |
HIP 13827 |
18.34 |
| 2026-05-18 12:00 |
02:56:51.77 |
-04:48:47.0 |
HIP 13827 |
17.22 |
| 2026-05-19 00:00 |
02:56:56.17 |
-04:48:31.9 |
HIP 13827 |
16.10 |
| 2026-05-19 12:00 |
02:57:00.56 |
-04:48:17.1 |
HIP 13827 |
14.98 |
| 2026-05-20 00:00 |
02:57:04.94 |
-04:48:02.5 |
HIP 13827 |
13.87 |
| 2026-05-20 12:00 |
02:57:09.32 |
-04:47:48.1 |
HIP 13827 |
12.76 |
| 2026-05-21 00:00 |
02:57:13.68 |
-04:47:34.0 |
HIP 13827 |
11.66 |
| 2026-05-21 12:00 |
02:57:18.04 |
-04:47:20.1 |
HIP 13827 |
10.57 |
| 2026-05-22 00:00 |
02:57:22.39 |
-04:47:06.5 |
HIP 13827 |
9.48 |
| 2026-05-22 12:00 |
02:57:26.73 |
-04:46:53.1 |
HIP 13827 |
8.39 |
| 2026-05-23 00:00 |
02:57:31.06 |
-04:46:40.0 |
HIP 13827 |
7.32 |
| 2026-05-23 12:00 |
02:57:35.38 |
-04:46:27.1 |
HIP 13827 |
6.27 |
| 2026-05-24 00:00 |
02:57:39.69 |
-04:46:14.4 |
HIP 13827 |
5.23 |
| 2026-05-24 12:00 |
02:57:43.99 |
-04:46:02.0 |
HIP 13827 |
4.24 |
| 2026-05-25 00:00 |
02:57:48.28 |
-04:45:49.9 |
HIP 13827 |
3.30 |
| 2026-05-25 12:00 |
02:57:52.56 |
-04:45:38.0 |
HIP 13827 |
2.50 |
| 2026-05-26 00:00 |
02:57:56.83 |
-04:45:26.3 |
HIP 13827 |
1.99 |
| 2026-05-26 12:00 |
02:58:01.09 |
-04:45:14.9 |
HIP 13827 |
2.00 |
| 2026-05-27 00:00 |
02:58:05.33 |
-04:45:03.8 |
HIP 13827 |
2.53 |
| 2026-05-27 12:00 |
02:58:09.57 |
-04:44:52.8 |
HIP 13827 |
3.33 |
| 2026-05-28 00:00 |
02:58:13.79 |
-04:44:42.2 |
HIP 13827 |
4.25 |
| 2026-05-28 12:00 |
02:58:18.00 |
-04:44:31.8 |
HIP 13827 |
5.22 |
| 2026-05-29 00:00 |
02:58:22.20 |
-04:44:21.6 |
HIP 13827 |
6.22 |
| 2026-05-29 12:00 |
02:58:26.38 |
-04:44:11.7 |
HIP 13827 |
7.24 |
| 2026-05-30 00:00 |
02:58:30.56 |
-04:44:02.0 |
HIP 13827 |
8.26 |
| 2026-05-30 12:00 |
02:58:34.72 |
-04:43:52.6 |
HIP 13910 |
8.96 |
| 2026-05-31 00:00 |
02:58:38.86 |
-04:43:43.5 |
HIP 13910 |
8.06 |
| 2026-05-31 12:00 |
02:58:43.00 |
-04:43:34.6 |
HIP 13910 |
7.20 |
| 2026-06-01 00:00 |
02:58:47.11 |
-04:43:25.9 |
HIP 13910 |
6.39 |
| 2026-06-01 12:00 |
02:58:51.22 |
-04:43:17.5 |
HIP 13910 |
5.67 |
| 2026-06-02 00:00 |
02:58:55.31 |
-04:43:09.4 |
HIP 13910 |
5.04 |