메타데이터
| 항목 |
값 |
| Designation |
P/2012 U2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-12-04T06:27:38.750400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:26Z |
| Obs used |
36 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-11-14.0000000 |
| e |
0.50656873 |
| q (au) |
3.627785 |
| a (au) |
7.352159 |
| i (deg) |
10.534475 |
| Ω (om, deg) |
186.863069 |
| ω (w, deg) |
229.534876 |
| M (ma, deg) |
358.997883 |
밝기
산란 + 전체 선형
$$
M_a = (9.078 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
9.078 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.973 |
| δ90 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
17:28:15.77 |
-12:34:08.7 |
HIP 85397 |
18.29 |
| 2026-09-20 12:00 |
17:28:20.17 |
-12:34:46.1 |
HIP 85397 |
19.47 |
| 2026-09-21 00:00 |
17:28:24.67 |
-12:35:23.4 |
HIP 85397 |
20.67 |
| 2026-09-21 12:00 |
17:28:29.27 |
-12:36:00.7 |
HIP 85397 |
21.91 |
| 2026-09-22 00:00 |
17:28:33.99 |
-12:36:38.0 |
HIP 85397 |
23.18 |
| 2026-09-22 12:00 |
17:28:38.81 |
-12:37:15.3 |
HIP 85397 |
24.47 |
| 2026-09-23 00:00 |
17:28:43.73 |
-12:37:52.6 |
HIP 85397 |
25.80 |
| 2026-09-23 12:00 |
17:28:48.76 |
-12:38:29.9 |
HIP 85397 |
27.15 |
| 2026-09-24 00:00 |
17:28:53.89 |
-12:39:07.2 |
HIP 85397 |
28.53 |
| 2026-09-24 12:00 |
17:28:59.13 |
-12:39:44.4 |
HIP 85397 |
29.93 |
| 2026-09-25 00:00 |
17:29:04.47 |
-12:40:21.7 |
HIP 85397 |
31.36 |
| 2026-09-25 12:00 |
17:29:09.91 |
-12:40:58.9 |
HIP 85397 |
32.82 |
| 2026-09-26 00:00 |
17:29:15.46 |
-12:41:36.0 |
HIP 85397 |
34.29 |
| 2026-09-26 12:00 |
17:29:21.10 |
-12:42:13.2 |
HIP 85397 |
35.80 |
| 2026-09-27 00:00 |
17:29:26.85 |
-12:42:50.3 |
HIP 85397 |
37.32 |
| 2026-09-27 12:00 |
17:29:32.71 |
-12:43:27.4 |
HIP 85809 |
37.99 |
| 2026-09-28 00:00 |
17:29:38.66 |
-12:44:04.4 |
HIP 85809 |
36.82 |
| 2026-09-28 12:00 |
17:29:44.72 |
-12:44:41.4 |
HIP 85809 |
35.66 |
| 2026-09-29 00:00 |
17:29:50.87 |
-12:45:18.4 |
HIP 85809 |
34.51 |
| 2026-09-29 12:00 |
17:29:57.13 |
-12:45:55.3 |
HIP 85809 |
33.38 |
| 2026-09-30 00:00 |
17:30:03.49 |
-12:46:32.2 |
HIP 85809 |
32.28 |
| 2026-09-30 12:00 |
17:30:09.95 |
-12:47:09.0 |
HIP 85809 |
31.20 |
| 2026-10-01 00:00 |
17:30:16.50 |
-12:47:45.8 |
HIP 85809 |
30.15 |
| 2026-10-01 12:00 |
17:30:23.16 |
-12:48:22.5 |
HIP 85809 |
29.15 |
| 2026-10-02 00:00 |
17:30:29.92 |
-12:48:59.1 |
HIP 85809 |
28.21 |
| 2026-10-02 12:00 |
17:30:36.77 |
-12:49:35.7 |
HIP 85809 |
27.32 |
| 2026-10-03 00:00 |
17:30:43.73 |
-12:50:12.3 |
HIP 85809 |
26.51 |
| 2026-10-03 12:00 |
17:30:50.78 |
-12:50:48.7 |
HIP 85809 |
25.78 |
| 2026-10-04 00:00 |
17:30:57.93 |
-12:51:25.1 |
HIP 85809 |
25.14 |
| 2026-10-04 12:00 |
17:31:05.17 |
-12:52:01.4 |
HIP 85809 |
24.62 |
| 2026-10-05 00:00 |
17:31:12.52 |
-12:52:37.7 |
HIP 85809 |
24.21 |
| 2026-10-05 12:00 |
17:31:19.96 |
-12:53:13.9 |
HIP 85809 |
23.94 |
| 2026-10-06 00:00 |
17:31:27.50 |
-12:53:49.9 |
HIP 85809 |
23.81 |
| 2026-10-06 12:00 |
17:31:35.13 |
-12:54:25.9 |
HIP 85809 |
23.83 |
| 2026-10-07 00:00 |
17:31:42.86 |
-12:55:01.9 |
HIP 85809 |
24.00 |
| 2026-10-07 12:00 |
17:31:50.69 |
-12:55:37.7 |
HIP 85809 |
24.33 |
| 2026-10-08 00:00 |
17:31:58.61 |
-12:56:13.4 |
HIP 85809 |
24.81 |
| 2026-10-08 12:00 |
17:32:06.62 |
-12:56:49.1 |
HIP 85809 |
25.45 |
| 2026-10-09 00:00 |
17:32:14.73 |
-12:57:24.6 |
HIP 85809 |
26.23 |
| 2026-10-09 12:00 |
17:32:22.94 |
-12:58:00.0 |
HIP 85809 |
27.15 |
| 2026-10-10 00:00 |
17:32:31.23 |
-12:58:35.4 |
HIP 85809 |
28.20 |
| 2026-10-10 12:00 |
17:32:39.62 |
-12:59:10.6 |
HIP 85809 |
29.36 |
| 2026-10-11 00:00 |
17:32:48.10 |
-12:59:45.7 |
HIP 85871 |
29.17 |