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) |
| 2026-09-20 00:00 |
12:59:33.96 |
-56:00:34.9 |
HIP 63424 |
6.11 |
| 2026-09-20 12:00 |
12:59:40.20 |
-56:00:29.1 |
HIP 63424 |
5.75 |
| 2026-09-21 00:00 |
12:59:46.44 |
-56:00:23.7 |
HIP 63424 |
5.52 |
| 2026-09-21 12:00 |
12:59:52.71 |
-56:00:18.7 |
HIP 63424 |
5.42 |
| 2026-09-22 00:00 |
12:59:58.98 |
-56:00:14.0 |
HIP 63424 |
5.48 |
| 2026-09-22 12:00 |
13:00:05.27 |
-56:00:09.8 |
HIP 63424 |
5.68 |
| 2026-09-23 00:00 |
13:00:11.58 |
-56:00:06.0 |
HIP 63424 |
6.02 |
| 2026-09-23 12:00 |
13:00:17.90 |
-56:00:02.7 |
HIP 63424 |
6.46 |
| 2026-09-24 00:00 |
13:00:24.23 |
-55:59:59.7 |
HIP 63424 |
7.00 |
| 2026-09-24 12:00 |
13:00:30.58 |
-55:59:57.1 |
HIP 63424 |
7.61 |
| 2026-09-25 00:00 |
13:00:36.94 |
-55:59:55.0 |
HIP 63424 |
8.27 |
| 2026-09-25 12:00 |
13:00:43.31 |
-55:59:53.2 |
HIP 63424 |
8.98 |
| 2026-09-26 00:00 |
13:00:49.69 |
-55:59:51.9 |
HIP 63424 |
9.72 |
| 2026-09-26 12:00 |
13:00:56.08 |
-55:59:50.9 |
HIP 63424 |
10.50 |
| 2026-09-27 00:00 |
13:01:02.49 |
-55:59:50.4 |
HIP 63424 |
11.29 |
| 2026-09-27 12:00 |
13:01:08.90 |
-55:59:50.3 |
HIP 63424 |
12.10 |
| 2026-09-28 00:00 |
13:01:15.33 |
-55:59:50.5 |
HIP 63424 |
12.93 |
| 2026-09-28 12:00 |
13:01:21.76 |
-55:59:51.2 |
HIP 63424 |
13.77 |
| 2026-09-29 00:00 |
13:01:28.21 |
-55:59:52.3 |
HIP 63424 |
14.62 |
| 2026-09-29 12:00 |
13:01:34.66 |
-55:59:53.8 |
HIP 63695 |
15.05 |
| 2026-09-30 00:00 |
13:01:41.12 |
-55:59:55.6 |
HIP 63695 |
14.24 |
| 2026-09-30 12:00 |
13:01:47.59 |
-55:59:57.9 |
HIP 63695 |
13.43 |
| 2026-10-01 00:00 |
13:01:54.07 |
-56:00:00.6 |
HIP 63695 |
12.63 |
| 2026-10-01 12:00 |
13:02:00.56 |
-56:00:03.7 |
HIP 63695 |
11.84 |
| 2026-10-02 00:00 |
13:02:07.05 |
-56:00:07.2 |
HIP 63695 |
11.06 |
| 2026-10-02 12:00 |
13:02:13.55 |
-56:00:11.1 |
HIP 63695 |
10.30 |
| 2026-10-03 00:00 |
13:02:20.06 |
-56:00:15.4 |
HIP 63695 |
9.56 |
| 2026-10-03 12:00 |
13:02:26.57 |
-56:00:20.0 |
HIP 63695 |
8.85 |
| 2026-10-04 00:00 |
13:02:33.09 |
-56:00:25.1 |
HIP 63695 |
8.17 |
| 2026-10-04 12:00 |
13:02:39.61 |
-56:00:30.6 |
HIP 63695 |
7.54 |
| 2026-10-05 00:00 |
13:02:46.14 |
-56:00:36.5 |
HIP 63695 |
6.96 |
| 2026-10-05 12:00 |
13:02:52.67 |
-56:00:42.7 |
HIP 63695 |
6.46 |
| 2026-10-06 00:00 |
13:02:59.21 |
-56:00:49.4 |
HIP 63695 |
6.04 |
| 2026-10-06 12:00 |
13:03:05.75 |
-56:00:56.5 |
HIP 63695 |
5.74 |
| 2026-10-07 00:00 |
13:03:12.29 |
-56:01:03.9 |
HIP 63695 |
5.57 |
| 2026-10-07 12:00 |
13:03:18.84 |
-56:01:11.8 |
HIP 63695 |
5.55 |
| 2026-10-08 00:00 |
13:03:25.39 |
-56:01:20.0 |
HIP 63695 |
5.67 |
| 2026-10-08 12:00 |
13:03:31.94 |
-56:01:28.6 |
HIP 63695 |
5.92 |
| 2026-10-09 00:00 |
13:03:38.49 |
-56:01:37.7 |
HIP 63695 |
6.30 |
| 2026-10-09 12:00 |
13:03:45.04 |
-56:01:47.1 |
HIP 63695 |
6.78 |
| 2026-10-10 00:00 |
13:03:51.59 |
-56:01:56.9 |
HIP 63695 |
7.34 |
| 2026-10-10 12:00 |
13:03:58.14 |
-56:02:07.1 |
HIP 63695 |
7.97 |
| 2026-10-11 00:00 |
13:04:04.70 |
-56:02:17.6 |
HIP 63695 |
8.65 |