메타데이터
| 항목 |
값 |
| Designation |
C/2017 U5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-12-19T02:35:57.655680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:37Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
10.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-11-25.0000000 |
| e |
0.74456954 |
| q (au) |
4.326737 |
| a (au) |
16.939001 |
| i (deg) |
18.956551 |
| Ω (om, deg) |
163.115368 |
| ω (w, deg) |
262.150770 |
| M (ma, deg) |
359.659169 |
밝기
산란 + 전체 선형
$$
M_a = (14.300 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.300 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-05-12 00:00 |
13:20:44.98 |
+04:27:55.6 |
HIP 65121 |
19.98 |
| 2026-05-12 12:00 |
13:20:40.06 |
+04:28:17.2 |
HIP 65121 |
20.36 |
| 2026-05-13 00:00 |
13:20:35.18 |
+04:28:38.4 |
HIP 65121 |
20.81 |
| 2026-05-13 12:00 |
13:20:30.33 |
+04:28:59.3 |
HIP 65106 |
20.66 |
| 2026-05-14 00:00 |
13:20:25.51 |
+04:29:19.7 |
HIP 65106 |
20.41 |
| 2026-05-14 12:00 |
13:20:20.73 |
+04:29:39.8 |
HIP 65106 |
20.23 |
| 2026-05-15 00:00 |
13:20:15.98 |
+04:29:59.4 |
HIP 65106 |
20.14 |
| 2026-05-15 12:00 |
13:20:11.27 |
+04:30:18.7 |
HIP 64958 |
19.82 |
| 2026-05-16 00:00 |
13:20:06.60 |
+04:30:37.5 |
HIP 64958 |
18.61 |
| 2026-05-16 12:00 |
13:20:01.96 |
+04:30:56.0 |
HIP 64958 |
17.42 |
| 2026-05-17 00:00 |
13:19:57.36 |
+04:31:14.0 |
HIP 64958 |
16.23 |
| 2026-05-17 12:00 |
13:19:52.80 |
+04:31:31.7 |
HIP 64958 |
15.06 |
| 2026-05-18 00:00 |
13:19:48.28 |
+04:31:49.0 |
HIP 64958 |
13.89 |
| 2026-05-18 12:00 |
13:19:43.80 |
+04:32:05.8 |
HIP 64958 |
12.74 |
| 2026-05-19 00:00 |
13:19:39.36 |
+04:32:22.3 |
HIP 64958 |
11.60 |
| 2026-05-19 12:00 |
13:19:34.96 |
+04:32:38.3 |
HIP 64958 |
10.47 |
| 2026-05-20 00:00 |
13:19:30.59 |
+04:32:53.9 |
HIP 64958 |
9.36 |
| 2026-05-20 12:00 |
13:19:26.27 |
+04:33:09.2 |
HIP 64958 |
8.25 |
| 2026-05-21 00:00 |
13:19:21.99 |
+04:33:24.0 |
HIP 64958 |
7.15 |
| 2026-05-21 12:00 |
13:19:17.75 |
+04:33:38.4 |
HIP 64958 |
6.07 |
| 2026-05-22 00:00 |
13:19:13.56 |
+04:33:52.4 |
HIP 64958 |
5.00 |
| 2026-05-22 12:00 |
13:19:09.40 |
+04:34:06.0 |
HIP 64958 |
3.94 |
| 2026-05-23 00:00 |
13:19:05.29 |
+04:34:19.2 |
HIP 64958 |
2.89 |
| 2026-05-23 12:00 |
13:19:01.22 |
+04:34:32.0 |
HIP 64958 |
1.86 |
| 2026-05-24 00:00 |
13:18:57.20 |
+04:34:44.4 |
HIP 64958 |
0.84 |
| 2026-05-24 12:00 |
13:18:53.21 |
+04:34:56.3 |
HIP 64958 |
0.25 |
| 2026-05-25 00:00 |
13:18:49.27 |
+04:35:07.9 |
HIP 64958 |
1.20 |
| 2026-05-25 12:00 |
13:18:45.38 |
+04:35:19.0 |
HIP 64958 |
2.18 |
| 2026-05-26 00:00 |
13:18:41.53 |
+04:35:29.8 |
HIP 64958 |
3.16 |
| 2026-05-26 12:00 |
13:18:37.73 |
+04:35:40.1 |
HIP 64958 |
4.12 |
| 2026-05-27 00:00 |
13:18:33.97 |
+04:35:50.0 |
HIP 64958 |
5.07 |
| 2026-05-27 12:00 |
13:18:30.25 |
+04:35:59.5 |
HIP 64958 |
6.01 |
| 2026-05-28 00:00 |
13:18:26.58 |
+04:36:08.7 |
HIP 64958 |
6.94 |
| 2026-05-28 12:00 |
13:18:22.96 |
+04:36:17.3 |
HIP 64958 |
7.85 |
| 2026-05-29 00:00 |
13:18:19.38 |
+04:36:25.6 |
HIP 64958 |
8.75 |
| 2026-05-29 12:00 |
13:18:15.85 |
+04:36:33.5 |
HIP 64958 |
9.64 |
| 2026-05-30 00:00 |
13:18:12.37 |
+04:36:41.0 |
HIP 64958 |
10.52 |
| 2026-05-30 12:00 |
13:18:08.93 |
+04:36:48.0 |
HIP 64958 |
11.38 |
| 2026-05-31 00:00 |
13:18:05.55 |
+04:36:54.7 |
HIP 64958 |
12.23 |
| 2026-05-31 12:00 |
13:18:02.20 |
+04:37:00.9 |
HIP 64958 |
13.07 |
| 2026-06-01 00:00 |
13:17:58.91 |
+04:37:06.8 |
HIP 64958 |
13.90 |
| 2026-06-01 12:00 |
13:17:55.66 |
+04:37:12.2 |
HIP 64958 |
14.71 |
| 2026-06-02 00:00 |
13:17:52.47 |
+04:37:17.2 |
HIP 64958 |
15.51 |