메타데이터
| 항목 |
값 |
| Designation |
C/2012 S4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-06-28T00:33:42.019200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:22Z |
| Obs used |
924 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-04-24.0000000 |
| e |
0.99998199 |
| q (au) |
4.348728 |
| a (au) |
241497.706412 |
| i (deg) |
126.541334 |
| Ω (om, deg) |
173.103524 |
| ω (w, deg) |
163.615485 |
| M (ma, deg) |
359.999999 |
밝기
산란 + 전체 선형
$$
M_a = (7.722 + 4.989\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.722 |
| n |
4.989 |
| gf |
0.979 |
| gb |
-0.511 |
| k |
0.800 |
| δ90 |
9.878 |
| 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) |
| 2026-06-01 00:00 |
12:53:26.89 |
-58:38:25.7 |
HIP 62823 |
10.26 |
| 2026-06-01 12:00 |
12:53:22.19 |
-58:37:27.1 |
HIP 62823 |
10.45 |
| 2026-06-02 00:00 |
12:53:17.54 |
-58:36:28.4 |
HIP 62823 |
10.77 |
| 2026-06-02 12:00 |
12:53:12.96 |
-58:35:29.5 |
HIP 62823 |
11.21 |
| 2026-06-03 00:00 |
12:53:08.44 |
-58:34:30.5 |
HIP 62823 |
11.75 |
| 2026-06-03 12:00 |
12:53:03.98 |
-58:33:31.4 |
HIP 62756 |
12.33 |
| 2026-06-04 00:00 |
12:52:59.58 |
-58:32:32.2 |
HIP 62756 |
11.46 |
| 2026-06-04 12:00 |
12:52:55.24 |
-58:31:32.9 |
HIP 62756 |
10.66 |
| 2026-06-05 00:00 |
12:52:50.96 |
-58:30:33.5 |
HIP 62756 |
9.92 |
| 2026-06-05 12:00 |
12:52:46.75 |
-58:29:34.0 |
HIP 62756 |
9.27 |
| 2026-06-06 00:00 |
12:52:42.60 |
-58:28:34.4 |
HIP 62756 |
8.73 |
| 2026-06-06 12:00 |
12:52:38.50 |
-58:27:34.7 |
HIP 62756 |
8.32 |
| 2026-06-07 00:00 |
12:52:34.48 |
-58:26:34.9 |
HIP 62756 |
8.06 |
| 2026-06-07 12:00 |
12:52:30.51 |
-58:25:35.0 |
HIP 62756 |
7.95 |
| 2026-06-08 00:00 |
12:52:26.61 |
-58:24:35.1 |
HIP 62756 |
8.01 |
| 2026-06-08 12:00 |
12:52:22.76 |
-58:23:35.0 |
HIP 62756 |
8.23 |
| 2026-06-09 00:00 |
12:52:18.99 |
-58:22:35.0 |
HIP 62756 |
8.60 |
| 2026-06-09 12:00 |
12:52:15.27 |
-58:21:34.8 |
HIP 62756 |
9.10 |
| 2026-06-10 00:00 |
12:52:11.62 |
-58:20:34.6 |
HIP 62756 |
9.70 |
| 2026-06-10 12:00 |
12:52:08.03 |
-58:19:34.3 |
HIP 62756 |
10.39 |
| 2026-06-11 00:00 |
12:52:04.51 |
-58:18:34.0 |
HIP 62756 |
11.16 |
| 2026-06-11 12:00 |
12:52:01.05 |
-58:17:33.6 |
HIP 62756 |
11.98 |
| 2026-06-12 00:00 |
12:51:57.65 |
-58:16:33.2 |
HIP 62680 |
12.29 |
| 2026-06-12 12:00 |
12:51:54.32 |
-58:15:32.8 |
HIP 62680 |
11.40 |
| 2026-06-13 00:00 |
12:51:51.05 |
-58:14:32.3 |
HIP 62680 |
10.55 |
| 2026-06-13 12:00 |
12:51:47.85 |
-58:13:31.8 |
HIP 62680 |
9.77 |
| 2026-06-14 00:00 |
12:51:44.71 |
-58:12:31.3 |
HIP 62680 |
9.05 |
| 2026-06-14 12:00 |
12:51:41.64 |
-58:11:30.7 |
HIP 62680 |
8.42 |
| 2026-06-15 00:00 |
12:51:38.63 |
-58:10:30.2 |
HIP 62680 |
7.91 |
| 2026-06-15 12:00 |
12:51:35.68 |
-58:09:29.6 |
HIP 62680 |
7.52 |
| 2026-06-16 00:00 |
12:51:32.80 |
-58:08:29.0 |
HIP 62680 |
7.28 |
| 2026-06-16 12:00 |
12:51:29.99 |
-58:07:28.5 |
HIP 62680 |
7.21 |
| 2026-06-17 00:00 |
12:51:27.24 |
-58:06:27.9 |
HIP 62680 |
7.30 |
| 2026-06-17 12:00 |
12:51:24.55 |
-58:05:27.3 |
HIP 62680 |
7.55 |
| 2026-06-18 00:00 |
12:51:21.93 |
-58:04:26.8 |
HIP 62680 |
7.94 |
| 2026-06-18 12:00 |
12:51:19.38 |
-58:03:26.3 |
HIP 62658 |
7.88 |
| 2026-06-19 00:00 |
12:51:16.89 |
-58:02:25.8 |
HIP 62658 |
7.59 |
| 2026-06-19 12:00 |
12:51:14.46 |
-58:01:25.3 |
HIP 62658 |
7.45 |
| 2026-06-20 00:00 |
12:51:12.10 |
-58:00:24.8 |
HIP 62658 |
7.47 |
| 2026-06-20 12:00 |
12:51:09.81 |
-57:59:24.4 |
HIP 62658 |
7.65 |
| 2026-06-21 00:00 |
12:51:07.58 |
-57:58:24.1 |
HIP 62658 |
7.96 |
| 2026-06-21 12:00 |
12:51:05.41 |
-57:57:23.8 |
HIP 62658 |
8.40 |
| 2026-06-22 00:00 |
12:51:03.31 |
-57:56:23.5 |
HIP 62658 |
8.95 |