메타데이터
| 항목 |
값 |
| Designation |
C/2013 S1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-08-02T22:01:29.435520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:40Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-10-10.0000000 |
| e |
1.00043244 |
| q (au) |
2.824323 |
| a (au) |
-6531.154578 |
| i (deg) |
83.961966 |
| Ω (om, deg) |
221.536559 |
| ω (w, deg) |
166.064281 |
| M (ma, deg) |
0.000127 |
밝기
산란 + 전체 선형
$$
M_a = (11.895 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.895 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.503 |
| k |
0.800 |
| δ90 |
9.999 |
| 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 |
11:58:48.64 |
-56:42:43.8 |
HIP 58356 |
11.31 |
| 2026-07-29 12:00 |
11:58:53.24 |
-56:42:07.5 |
HIP 58356 |
12.17 |
| 2026-07-30 00:00 |
11:58:57.87 |
-56:41:31.6 |
HIP 58356 |
13.03 |
| 2026-07-30 12:00 |
11:59:02.55 |
-56:40:56.0 |
HIP 58356 |
13.90 |
| 2026-07-31 00:00 |
11:59:07.27 |
-56:40:20.8 |
HIP 58346 |
14.34 |
| 2026-07-31 12:00 |
11:59:12.03 |
-56:39:46.0 |
HIP 58346 |
14.38 |
| 2026-08-01 00:00 |
11:59:16.83 |
-56:39:11.5 |
HIP 58346 |
14.47 |
| 2026-08-01 12:00 |
11:59:21.67 |
-56:38:37.4 |
HIP 58346 |
14.62 |
| 2026-08-02 00:00 |
11:59:26.55 |
-56:38:03.6 |
HIP 58346 |
14.83 |
| 2026-08-02 12:00 |
11:59:31.47 |
-56:37:30.2 |
HIP 58346 |
15.10 |
| 2026-08-03 00:00 |
11:59:36.43 |
-56:36:57.2 |
HIP 58346 |
15.42 |
| 2026-08-03 12:00 |
11:59:41.42 |
-56:36:24.6 |
HIP 58618 |
15.22 |
| 2026-08-04 00:00 |
11:59:46.46 |
-56:35:52.3 |
HIP 58618 |
14.35 |
| 2026-08-04 12:00 |
11:59:51.53 |
-56:35:20.4 |
HIP 58618 |
13.48 |
| 2026-08-05 00:00 |
11:59:56.65 |
-56:34:48.8 |
HIP 58618 |
12.60 |
| 2026-08-05 12:00 |
12:00:01.80 |
-56:34:17.7 |
HIP 58618 |
11.73 |
| 2026-08-06 00:00 |
12:00:06.98 |
-56:33:46.9 |
HIP 58618 |
10.85 |
| 2026-08-06 12:00 |
12:00:12.21 |
-56:33:16.5 |
HIP 58618 |
9.97 |
| 2026-08-07 00:00 |
12:00:17.47 |
-56:32:46.5 |
HIP 58618 |
9.09 |
| 2026-08-07 12:00 |
12:00:22.76 |
-56:32:16.9 |
HIP 58618 |
8.22 |
| 2026-08-08 00:00 |
12:00:28.10 |
-56:31:47.6 |
HIP 58618 |
7.34 |
| 2026-08-08 12:00 |
12:00:33.47 |
-56:31:18.8 |
HIP 58618 |
6.45 |
| 2026-08-09 00:00 |
12:00:38.87 |
-56:30:50.3 |
HIP 58618 |
5.57 |
| 2026-08-09 12:00 |
12:00:44.31 |
-56:30:22.2 |
HIP 58618 |
4.69 |
| 2026-08-10 00:00 |
12:00:49.79 |
-56:29:54.5 |
HIP 58618 |
3.81 |
| 2026-08-10 12:00 |
12:00:55.30 |
-56:29:27.2 |
HIP 58618 |
2.93 |
| 2026-08-11 00:00 |
12:01:00.84 |
-56:29:00.3 |
HIP 58618 |
2.04 |
| 2026-08-11 12:00 |
12:01:06.42 |
-56:28:33.8 |
HIP 58618 |
1.17 |
| 2026-08-12 00:00 |
12:01:12.03 |
-56:28:07.7 |
HIP 58618 |
0.34 |
| 2026-08-12 12:00 |
12:01:17.67 |
-56:27:42.0 |
HIP 58618 |
0.67 |
| 2026-08-13 00:00 |
12:01:23.35 |
-56:27:16.7 |
HIP 58618 |
1.54 |
| 2026-08-13 12:00 |
12:01:29.06 |
-56:26:51.8 |
HIP 58618 |
2.42 |
| 2026-08-14 00:00 |
12:01:34.80 |
-56:26:27.3 |
HIP 58618 |
3.31 |
| 2026-08-14 12:00 |
12:01:40.58 |
-56:26:03.1 |
HIP 58618 |
4.20 |
| 2026-08-15 00:00 |
12:01:46.38 |
-56:25:39.4 |
HIP 58618 |
5.09 |
| 2026-08-15 12:00 |
12:01:52.21 |
-56:25:16.1 |
HIP 58618 |
5.99 |
| 2026-08-16 00:00 |
12:01:58.08 |
-56:24:53.2 |
HIP 58618 |
6.88 |
| 2026-08-16 12:00 |
12:02:03.98 |
-56:24:30.8 |
HIP 58618 |
7.78 |
| 2026-08-17 00:00 |
12:02:09.90 |
-56:24:08.7 |
HIP 58618 |
8.67 |
| 2026-08-17 12:00 |
12:02:15.86 |
-56:23:47.0 |
HIP 58618 |
9.57 |
| 2026-08-18 00:00 |
12:02:21.84 |
-56:23:25.7 |
HIP 58711 |
10.28 |
| 2026-08-18 12:00 |
12:02:27.85 |
-56:23:04.9 |
HIP 58711 |
10.56 |
| 2026-08-19 00:00 |
12:02:33.89 |
-56:22:44.4 |
HIP 58711 |
10.89 |