메타데이터
| 항목 |
값 |
| Designation |
P/2017 U3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-04-21T20:05:53.658240Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:39Z |
| Obs used |
73 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2017-08-27.0000000 |
| e |
0.09998087 |
| q (au) |
4.443406 |
| a (au) |
4.937013 |
| i (deg) |
15.908436 |
| Ω (om, deg) |
165.150002 |
| ω (w, deg) |
297.458320 |
| M (ma, deg) |
305.836360 |
밝기
산란 + 전체 선형
$$
M_a = (15.774 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.774 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.580 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
22:36:11.06 |
-04:20:04.6 |
HIP 111710 |
24.38 |
| 2026-07-29 12:00 |
22:36:01.21 |
-04:21:38.1 |
HIP 111710 |
27.17 |
| 2026-07-30 00:00 |
22:35:51.24 |
-04:23:12.6 |
HIP 111484 |
27.94 |
| 2026-07-30 12:00 |
22:35:41.13 |
-04:24:48.2 |
HIP 111373 |
28.56 |
| 2026-07-31 00:00 |
22:35:30.90 |
-04:26:24.9 |
HIP 111373 |
25.89 |
| 2026-07-31 12:00 |
22:35:20.54 |
-04:28:02.6 |
HIP 111373 |
23.26 |
| 2026-08-01 00:00 |
22:35:10.06 |
-04:29:41.3 |
HIP 111373 |
20.72 |
| 2026-08-01 12:00 |
22:34:59.46 |
-04:31:21.0 |
HIP 111373 |
18.32 |
| 2026-08-02 00:00 |
22:34:48.73 |
-04:33:01.8 |
HIP 111373 |
16.15 |
| 2026-08-02 12:00 |
22:34:37.88 |
-04:34:43.5 |
HIP 111373 |
14.34 |
| 2026-08-03 00:00 |
22:34:26.92 |
-04:36:26.3 |
HIP 111373 |
13.05 |
| 2026-08-03 12:00 |
22:34:15.83 |
-04:38:10.0 |
HIP 111373 |
12.47 |
| 2026-08-04 00:00 |
22:34:04.64 |
-04:39:54.7 |
HIP 111373 |
12.74 |
| 2026-08-04 12:00 |
22:33:53.33 |
-04:41:40.3 |
HIP 111381 |
11.44 |
| 2026-08-05 00:00 |
22:33:41.90 |
-04:43:26.9 |
HIP 111381 |
10.15 |
| 2026-08-05 12:00 |
22:33:30.37 |
-04:45:14.5 |
HIP 111381 |
9.88 |
| 2026-08-06 00:00 |
22:33:18.73 |
-04:47:03.0 |
HIP 111381 |
10.75 |
| 2026-08-06 12:00 |
22:33:06.98 |
-04:48:52.4 |
HIP 111381 |
12.54 |
| 2026-08-07 00:00 |
22:32:55.12 |
-04:50:42.7 |
HIP 111381 |
14.95 |
| 2026-08-07 12:00 |
22:32:43.16 |
-04:52:33.9 |
HIP 111381 |
17.75 |
| 2026-08-08 00:00 |
22:32:31.11 |
-04:54:26.0 |
HIP 111281 |
16.01 |
| 2026-08-08 12:00 |
22:32:18.95 |
-04:56:18.9 |
HIP 111281 |
14.75 |
| 2026-08-09 00:00 |
22:32:06.69 |
-04:58:12.8 |
HIP 111281 |
14.29 |
| 2026-08-09 12:00 |
22:31:54.34 |
-05:00:07.4 |
HIP 111281 |
14.72 |
| 2026-08-10 00:00 |
22:31:41.90 |
-05:02:02.9 |
HIP 111281 |
16.00 |
| 2026-08-10 12:00 |
22:31:29.36 |
-05:03:59.3 |
HIP 111281 |
17.95 |
| 2026-08-11 00:00 |
22:31:16.74 |
-05:05:56.4 |
HIP 111281 |
20.41 |
| 2026-08-11 12:00 |
22:31:04.03 |
-05:07:54.3 |
HIP 111102 |
20.95 |
| 2026-08-12 00:00 |
22:30:51.24 |
-05:09:53.0 |
HIP 111102 |
21.68 |
| 2026-08-12 12:00 |
22:30:38.36 |
-05:11:52.5 |
HIP 111102 |
23.02 |
| 2026-08-13 00:00 |
22:30:25.41 |
-05:13:52.6 |
HIP 111102 |
24.88 |
| 2026-08-13 12:00 |
22:30:12.37 |
-05:15:53.6 |
HIP 111102 |
27.16 |
| 2026-08-14 00:00 |
22:29:59.27 |
-05:17:55.2 |
HIP 111102 |
29.78 |
| 2026-08-14 12:00 |
22:29:46.09 |
-05:19:57.5 |
HIP 111102 |
32.65 |
| 2026-08-15 00:00 |
22:29:32.84 |
-05:22:00.6 |
HIP 111102 |
35.73 |
| 2026-08-15 12:00 |
22:29:19.52 |
-05:24:04.2 |
HIP 110920 |
37.12 |
| 2026-08-16 00:00 |
22:29:06.14 |
-05:26:08.6 |
HIP 110883 |
33.74 |
| 2026-08-16 12:00 |
22:28:52.70 |
-05:28:13.5 |
HIP 110883 |
30.21 |
| 2026-08-17 00:00 |
22:28:39.19 |
-05:30:19.1 |
HIP 110883 |
26.78 |
| 2026-08-17 12:00 |
22:28:25.63 |
-05:32:25.2 |
HIP 110883 |
23.50 |
| 2026-08-18 00:00 |
22:28:12.01 |
-05:34:32.0 |
HIP 110883 |
20.45 |
| 2026-08-18 12:00 |
22:27:58.34 |
-05:36:39.3 |
HIP 110883 |
17.77 |
| 2026-08-19 00:00 |
22:27:44.62 |
-05:38:47.1 |
HIP 110883 |
15.67 |