메타데이터
| 항목 |
값 |
| Designation |
P/2020 U2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-12-25T16:46:43.095360Z |
| Orbit solution date (soln_date, UTC) |
2021-07-01T22:13:00Z |
| Obs used |
301 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
26.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-10-20T09:20:45.801600Z |
| Discovery magnitude (MPC) |
21.70 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-01-12.0000000 |
| e |
0.51048764 |
| q (au) |
1.848825 |
| a (au) |
3.776871 |
| i (deg) |
6.420975 |
| Ω (om, deg) |
342.901523 |
| ω (w, deg) |
84.644930 |
| M (ma, deg) |
2.323134 |
밝기
산란 + 전체 선형
$$
M_a = (12.635 + 5.176\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
12.635 |
| n |
5.176 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-07-29 00:00 |
19:04:48.99 |
-29:13:44.3 |
HIP 93769 |
15.45 |
| 2026-07-29 12:00 |
19:04:27.58 |
-29:13:46.7 |
HIP 93769 |
19.48 |
| 2026-07-30 00:00 |
19:04:06.30 |
-29:13:48.2 |
HIP 93769 |
23.71 |
| 2026-07-30 12:00 |
19:03:45.15 |
-29:13:49.0 |
HIP 93485 |
19.81 |
| 2026-07-31 00:00 |
19:03:24.14 |
-29:13:48.9 |
HIP 93485 |
15.57 |
| 2026-07-31 12:00 |
19:03:03.25 |
-29:13:48.0 |
HIP 93485 |
11.64 |
| 2026-08-01 00:00 |
19:02:42.51 |
-29:13:46.3 |
HIP 93485 |
8.38 |
| 2026-08-01 12:00 |
19:02:21.91 |
-29:13:43.9 |
HIP 93485 |
6.80 |
| 2026-08-02 00:00 |
19:02:01.45 |
-29:13:40.6 |
HIP 93485 |
7.90 |
| 2026-08-02 12:00 |
19:01:41.15 |
-29:13:36.6 |
HIP 93485 |
10.87 |
| 2026-08-03 00:00 |
19:01:21.00 |
-29:13:31.7 |
HIP 93485 |
14.57 |
| 2026-08-03 12:00 |
19:01:01.00 |
-29:13:26.1 |
HIP 93485 |
18.55 |
| 2026-08-04 00:00 |
19:00:41.16 |
-29:13:19.7 |
HIP 93485 |
22.64 |
| 2026-08-04 12:00 |
19:00:21.48 |
-29:13:12.5 |
HIP 93181 |
26.71 |
| 2026-08-05 00:00 |
19:00:01.97 |
-29:13:04.6 |
HIP 93181 |
23.70 |
| 2026-08-05 12:00 |
18:59:42.63 |
-29:12:55.9 |
HIP 93181 |
21.14 |
| 2026-08-06 00:00 |
18:59:23.46 |
-29:12:46.4 |
HIP 93181 |
19.22 |
| 2026-08-06 12:00 |
18:59:04.46 |
-29:12:36.2 |
HIP 93181 |
18.09 |
| 2026-08-07 00:00 |
18:58:45.64 |
-29:12:25.2 |
HIP 93181 |
17.88 |
| 2026-08-07 12:00 |
18:58:27.00 |
-29:12:13.5 |
HIP 93181 |
18.61 |
| 2026-08-08 00:00 |
18:58:08.55 |
-29:12:01.0 |
HIP 93181 |
20.14 |
| 2026-08-08 12:00 |
18:57:50.28 |
-29:11:47.8 |
HIP 93181 |
22.29 |
| 2026-08-09 00:00 |
18:57:32.20 |
-29:11:33.9 |
HIP 93181 |
24.87 |
| 2026-08-09 12:00 |
18:57:14.32 |
-29:11:19.3 |
HIP 92940 |
22.44 |
| 2026-08-10 00:00 |
18:56:56.63 |
-29:11:03.9 |
HIP 92870 |
19.87 |
| 2026-08-10 12:00 |
18:56:39.14 |
-29:10:47.8 |
HIP 92870 |
16.10 |
| 2026-08-11 00:00 |
18:56:21.86 |
-29:10:31.0 |
HIP 92870 |
12.42 |
| 2026-08-11 12:00 |
18:56:04.77 |
-29:10:13.5 |
HIP 92870 |
8.86 |
| 2026-08-12 00:00 |
18:55:47.90 |
-29:09:55.3 |
HIP 92870 |
5.59 |
| 2026-08-12 12:00 |
18:55:31.23 |
-29:09:36.4 |
HIP 92870 |
3.38 |
| 2026-08-13 00:00 |
18:55:14.78 |
-29:09:16.8 |
HIP 92870 |
4.27 |
| 2026-08-13 12:00 |
18:54:58.55 |
-29:08:56.6 |
HIP 92870 |
7.10 |
| 2026-08-14 00:00 |
18:54:42.53 |
-29:08:35.7 |
HIP 92870 |
10.36 |
| 2026-08-14 12:00 |
18:54:26.73 |
-29:08:14.1 |
HIP 92870 |
13.70 |
| 2026-08-15 00:00 |
18:54:11.16 |
-29:07:51.9 |
HIP 92870 |
17.05 |
| 2026-08-15 12:00 |
18:53:55.81 |
-29:07:29.0 |
HIP 92870 |
20.37 |
| 2026-08-16 00:00 |
18:53:40.68 |
-29:07:05.4 |
HIP 92643 |
20.94 |
| 2026-08-16 12:00 |
18:53:25.79 |
-29:06:41.3 |
HIP 92643 |
19.28 |
| 2026-08-17 00:00 |
18:53:11.13 |
-29:06:16.5 |
HIP 92643 |
18.10 |
| 2026-08-17 12:00 |
18:52:56.70 |
-29:05:51.0 |
HIP 92643 |
17.46 |
| 2026-08-18 00:00 |
18:52:42.50 |
-29:05:25.0 |
HIP 92643 |
17.40 |
| 2026-08-18 12:00 |
18:52:28.54 |
-29:04:58.4 |
HIP 92564 |
17.18 |
| 2026-08-19 00:00 |
18:52:14.82 |
-29:04:31.1 |
HIP 92564 |
16.07 |