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) |
| 2026-03-26 00:00 |
00:07:39.24 |
-20:55:23.0 |
HIP 553 |
16.08 |
| 2026-03-26 12:00 |
00:07:44.30 |
-20:55:00.4 |
HIP 553 |
17.24 |
| 2026-03-27 00:00 |
00:07:49.37 |
-20:54:38.1 |
HIP 553 |
18.41 |
| 2026-03-27 12:00 |
00:07:54.42 |
-20:54:16.1 |
HIP 553 |
19.58 |
| 2026-03-28 00:00 |
00:07:59.47 |
-20:53:54.4 |
HIP 553 |
20.76 |
| 2026-03-28 12:00 |
00:08:04.52 |
-20:53:33.1 |
HIP 553 |
21.94 |
| 2026-03-29 00:00 |
00:08:09.56 |
-20:53:12.1 |
HIP 724 |
22.41 |
| 2026-03-29 12:00 |
00:08:14.59 |
-20:52:51.4 |
HIP 724 |
22.12 |
| 2026-03-30 00:00 |
00:08:19.62 |
-20:52:31.1 |
HIP 724 |
21.90 |
| 2026-03-30 12:00 |
00:08:24.64 |
-20:52:11.1 |
HIP 724 |
21.75 |
| 2026-03-31 00:00 |
00:08:29.65 |
-20:51:51.4 |
HIP 724 |
21.65 |
| 2026-03-31 12:00 |
00:08:34.66 |
-20:51:32.1 |
HIP 724 |
21.62 |
| 2026-04-01 00:00 |
00:08:39.65 |
-20:51:13.2 |
HIP 724 |
21.65 |
| 2026-04-01 12:00 |
00:08:44.64 |
-20:50:54.6 |
HIP 724 |
21.74 |
| 2026-04-02 00:00 |
00:08:49.62 |
-20:50:36.3 |
HIP 724 |
21.89 |
| 2026-04-02 12:00 |
00:08:54.59 |
-20:50:18.4 |
HIP 724 |
22.10 |
| 2026-04-03 00:00 |
00:08:59.55 |
-20:50:00.8 |
HIP 724 |
22.36 |
| 2026-04-03 12:00 |
00:09:04.50 |
-20:49:43.6 |
HIP 724 |
22.68 |
| 2026-04-04 00:00 |
00:09:09.44 |
-20:49:26.8 |
HIP 724 |
23.06 |
| 2026-04-04 12:00 |
00:09:14.37 |
-20:49:10.3 |
HIP 724 |
23.47 |
| 2026-04-05 00:00 |
00:09:19.29 |
-20:48:54.1 |
HIP 724 |
23.94 |
| 2026-04-05 12:00 |
00:09:24.19 |
-20:48:38.3 |
HIP 724 |
24.44 |
| 2026-04-06 00:00 |
00:09:29.09 |
-20:48:22.9 |
HIP 724 |
24.99 |
| 2026-04-06 12:00 |
00:09:33.97 |
-20:48:07.9 |
HIP 911 |
24.63 |
| 2026-04-07 00:00 |
00:09:38.84 |
-20:47:53.2 |
HIP 911 |
23.46 |
| 2026-04-07 12:00 |
00:09:43.70 |
-20:47:38.9 |
HIP 911 |
22.30 |
| 2026-04-08 00:00 |
00:09:48.54 |
-20:47:24.9 |
HIP 911 |
21.15 |
| 2026-04-08 12:00 |
00:09:53.37 |
-20:47:11.3 |
HIP 911 |
20.00 |
| 2026-04-09 00:00 |
00:09:58.18 |
-20:46:58.1 |
HIP 911 |
18.85 |
| 2026-04-09 12:00 |
00:10:02.98 |
-20:46:45.3 |
HIP 911 |
17.71 |
| 2026-04-10 00:00 |
00:10:07.77 |
-20:46:32.9 |
HIP 911 |
16.57 |
| 2026-04-10 12:00 |
00:10:12.54 |
-20:46:20.8 |
HIP 911 |
15.44 |
| 2026-04-11 00:00 |
00:10:17.29 |
-20:46:09.1 |
HIP 911 |
14.31 |
| 2026-04-11 12:00 |
00:10:22.03 |
-20:45:57.8 |
HIP 911 |
13.19 |
| 2026-04-12 00:00 |
00:10:26.75 |
-20:45:46.9 |
HIP 911 |
12.07 |
| 2026-04-12 12:00 |
00:10:31.46 |
-20:45:36.4 |
HIP 911 |
10.95 |
| 2026-04-13 00:00 |
00:10:36.15 |
-20:45:26.2 |
HIP 911 |
9.85 |
| 2026-04-13 12:00 |
00:10:40.82 |
-20:45:16.5 |
HIP 911 |
8.74 |
| 2026-04-14 00:00 |
00:10:45.47 |
-20:45:07.1 |
HIP 911 |
7.65 |
| 2026-04-14 12:00 |
00:10:50.10 |
-20:44:58.2 |
HIP 911 |
6.56 |
| 2026-04-15 00:00 |
00:10:54.71 |
-20:44:49.6 |
HIP 911 |
5.48 |
| 2026-04-15 12:00 |
00:10:59.31 |
-20:44:41.4 |
HIP 911 |
4.40 |
| 2026-04-16 00:00 |
00:11:03.88 |
-20:44:33.7 |
HIP 911 |
3.34 |