메타데이터
| 항목 |
값 |
| Designation |
C/2017 U4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-09-25T16:38:00.893760Z |
| Orbit solution date (soln_date, UTC) |
2023-02-13T23:12:42Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
10.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-01-03.0000000 |
| e |
1.00304382 |
| q (au) |
7.724158 |
| a (au) |
-2537.649728 |
| i (deg) |
158.225721 |
| Ω (om, deg) |
245.952559 |
| ω (w, deg) |
159.177100 |
| M (ma, deg) |
-0.002049 |
밝기
산란 + 전체 선형
$$
M_a = (2.306 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
2.306 |
| n |
6.000 |
| gf |
0.992 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.972 |
| 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 |
00:14:25.07 |
-20:47:30.0 |
HIP 1072 |
18.75 |
| 2026-05-12 12:00 |
00:14:28.07 |
-20:47:45.0 |
HIP 1072 |
19.47 |
| 2026-05-13 00:00 |
00:14:31.04 |
-20:48:00.4 |
HIP 1072 |
20.19 |
| 2026-05-13 12:00 |
00:14:33.96 |
-20:48:16.2 |
HIP 1072 |
20.91 |
| 2026-05-14 00:00 |
00:14:36.85 |
-20:48:32.5 |
HIP 1072 |
21.63 |
| 2026-05-14 12:00 |
00:14:39.69 |
-20:48:49.2 |
HIP 1072 |
22.34 |
| 2026-05-15 00:00 |
00:14:42.50 |
-20:49:06.4 |
HIP 1072 |
23.05 |
| 2026-05-15 12:00 |
00:14:45.27 |
-20:49:24.0 |
HIP 1147 |
23.10 |
| 2026-05-16 00:00 |
00:14:47.99 |
-20:49:42.1 |
HIP 1147 |
22.97 |
| 2026-05-16 12:00 |
00:14:50.67 |
-20:50:00.6 |
HIP 1147 |
22.86 |
| 2026-05-17 00:00 |
00:14:53.32 |
-20:50:19.6 |
HIP 1147 |
22.76 |
| 2026-05-17 12:00 |
00:14:55.92 |
-20:50:39.1 |
HIP 1147 |
22.66 |
| 2026-05-18 00:00 |
00:14:58.48 |
-20:50:58.9 |
HIP 1147 |
22.58 |
| 2026-05-18 12:00 |
00:15:00.99 |
-20:51:19.3 |
HIP 1147 |
22.50 |
| 2026-05-19 00:00 |
00:15:03.47 |
-20:51:40.1 |
HIP 1147 |
22.44 |
| 2026-05-19 12:00 |
00:15:05.90 |
-20:52:01.3 |
HIP 1147 |
22.38 |
| 2026-05-20 00:00 |
00:15:08.28 |
-20:52:23.0 |
HIP 1147 |
22.34 |
| 2026-05-20 12:00 |
00:15:10.63 |
-20:52:45.1 |
HIP 1147 |
22.30 |
| 2026-05-21 00:00 |
00:15:12.93 |
-20:53:07.7 |
HIP 1147 |
22.26 |
| 2026-05-21 12:00 |
00:15:15.18 |
-20:53:30.7 |
HIP 1147 |
22.24 |
| 2026-05-22 00:00 |
00:15:17.40 |
-20:53:54.2 |
HIP 1147 |
22.22 |
| 2026-05-22 12:00 |
00:15:19.56 |
-20:54:18.1 |
HIP 1147 |
22.21 |
| 2026-05-23 00:00 |
00:15:21.68 |
-20:54:42.5 |
HIP 1147 |
22.20 |
| 2026-05-23 12:00 |
00:15:23.76 |
-20:55:07.3 |
HIP 1147 |
22.20 |
| 2026-05-24 00:00 |
00:15:25.79 |
-20:55:32.6 |
HIP 1147 |
22.21 |
| 2026-05-24 12:00 |
00:15:27.78 |
-20:55:58.3 |
HIP 1147 |
22.22 |
| 2026-05-25 00:00 |
00:15:29.72 |
-20:56:24.5 |
HIP 1147 |
22.24 |
| 2026-05-25 12:00 |
00:15:31.61 |
-20:56:51.0 |
HIP 1147 |
22.26 |
| 2026-05-26 00:00 |
00:15:33.46 |
-20:57:18.1 |
HIP 1147 |
22.29 |
| 2026-05-26 12:00 |
00:15:35.27 |
-20:57:45.5 |
HIP 1147 |
22.32 |
| 2026-05-27 00:00 |
00:15:37.02 |
-20:58:13.5 |
HIP 1147 |
22.35 |
| 2026-05-27 12:00 |
00:15:38.73 |
-20:58:41.8 |
HIP 1147 |
22.39 |
| 2026-05-28 00:00 |
00:15:40.39 |
-20:59:10.6 |
HIP 1147 |
22.43 |
| 2026-05-28 12:00 |
00:15:42.00 |
-20:59:39.8 |
HIP 1147 |
22.48 |
| 2026-05-29 00:00 |
00:15:43.57 |
-21:00:09.5 |
HIP 1147 |
22.53 |
| 2026-05-29 12:00 |
00:15:45.09 |
-21:00:39.6 |
HIP 1147 |
22.58 |
| 2026-05-30 00:00 |
00:15:46.56 |
-21:01:10.1 |
HIP 1147 |
22.63 |
| 2026-05-30 12:00 |
00:15:47.98 |
-21:01:41.1 |
HIP 1147 |
22.69 |
| 2026-05-31 00:00 |
00:15:49.35 |
-21:02:12.5 |
HIP 1147 |
22.75 |
| 2026-05-31 12:00 |
00:15:50.68 |
-21:02:44.4 |
HIP 1147 |
22.82 |
| 2026-06-01 00:00 |
00:15:51.96 |
-21:03:16.6 |
HIP 1147 |
22.89 |
| 2026-06-01 12:00 |
00:15:53.18 |
-21:03:49.4 |
HIP 1147 |
22.96 |
| 2026-06-02 00:00 |
00:15:54.36 |
-21:04:22.5 |
HIP 1147 |
23.03 |