C/2009 K2 (Catalina)
메타데이터
| 항목 |
값 |
| Designation |
C/2009 K2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-02-07T11:38:37.547520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:31Z |
| Obs used |
665 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
7.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2009-08-14.0000000 |
| e |
0.99777882 |
| q (au) |
3.246176 |
| a (au) |
1461.466569 |
| i (deg) |
66.821915 |
| Ω (om, deg) |
123.805511 |
| ω (w, deg) |
147.693496 |
| M (ma, deg) |
359.996869 |
밝기
산란 + 전체 선형
$$
M_a = (8.365 + 4.470\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.365 |
| n |
4.470 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-02-03 00:00 |
05:23:37.86 |
-36:49:44.4 |
HIP 25190 |
10.06 |
| 2026-02-03 12:00 |
05:23:35.29 |
-36:49:04.4 |
HIP 25190 |
9.26 |
| 2026-02-04 00:00 |
05:23:32.75 |
-36:48:24.1 |
HIP 25190 |
8.47 |
| 2026-02-04 12:00 |
05:23:30.25 |
-36:47:43.5 |
HIP 25190 |
7.69 |
| 2026-02-05 00:00 |
05:23:27.78 |
-36:47:02.7 |
HIP 25190 |
6.92 |
| 2026-02-05 12:00 |
05:23:25.34 |
-36:46:21.6 |
HIP 25190 |
6.16 |
| 2026-02-06 00:00 |
05:23:22.94 |
-36:45:40.3 |
HIP 25190 |
5.43 |
| 2026-02-06 12:00 |
05:23:20.57 |
-36:44:58.8 |
HIP 25190 |
4.72 |
| 2026-02-07 00:00 |
05:23:18.23 |
-36:44:17.0 |
HIP 25190 |
4.06 |
| 2026-02-07 12:00 |
05:23:15.94 |
-36:43:35.0 |
HIP 25190 |
3.48 |
| 2026-02-08 00:00 |
05:23:13.67 |
-36:42:52.7 |
HIP 25190 |
3.01 |
| 2026-02-08 12:00 |
05:23:11.44 |
-36:42:10.2 |
HIP 25190 |
2.71 |
| 2026-02-09 00:00 |
05:23:09.25 |
-36:41:27.5 |
HIP 25190 |
2.65 |
| 2026-02-09 12:00 |
05:23:07.09 |
-36:40:44.6 |
HIP 25190 |
2.84 |
| 2026-02-10 00:00 |
05:23:04.97 |
-36:40:01.5 |
HIP 25190 |
3.23 |
| 2026-02-10 12:00 |
05:23:02.88 |
-36:39:18.1 |
HIP 25190 |
3.77 |
| 2026-02-11 00:00 |
05:23:00.83 |
-36:38:34.5 |
HIP 25190 |
4.39 |
| 2026-02-11 12:00 |
05:22:58.82 |
-36:37:50.8 |
HIP 25190 |
5.07 |
| 2026-02-12 00:00 |
05:22:56.84 |
-36:37:06.8 |
HIP 25190 |
5.79 |
| 2026-02-12 12:00 |
05:22:54.90 |
-36:36:22.6 |
HIP 25190 |
6.53 |
| 2026-02-13 00:00 |
05:22:53.00 |
-36:35:38.2 |
HIP 25190 |
7.28 |
| 2026-02-13 12:00 |
05:22:51.13 |
-36:34:53.7 |
HIP 25190 |
8.05 |
| 2026-02-14 00:00 |
05:22:49.30 |
-36:34:08.9 |
HIP 25190 |
8.83 |
| 2026-02-14 12:00 |
05:22:47.50 |
-36:33:23.9 |
HIP 25190 |
9.61 |
| 2026-02-15 00:00 |
05:22:45.75 |
-36:32:38.8 |
HIP 25190 |
10.40 |
| 2026-02-15 12:00 |
05:22:44.03 |
-36:31:53.5 |
HIP 25190 |
11.19 |
| 2026-02-16 00:00 |
05:22:42.35 |
-36:31:08.0 |
HIP 25186 |
11.06 |
| 2026-02-16 12:00 |
05:22:40.70 |
-36:30:22.4 |
HIP 25186 |
10.67 |
| 2026-02-17 00:00 |
05:22:39.09 |
-36:29:36.5 |
HIP 25186 |
10.34 |
| 2026-02-17 12:00 |
05:22:37.53 |
-36:28:50.5 |
HIP 25186 |
10.05 |
| 2026-02-18 00:00 |
05:22:36.00 |
-36:28:04.4 |
HIP 25186 |
9.82 |
| 2026-02-18 12:00 |
05:22:34.50 |
-36:27:18.1 |
HIP 25186 |
9.64 |
| 2026-02-19 00:00 |
05:22:33.05 |
-36:26:31.6 |
HIP 25186 |
9.53 |
| 2026-02-19 12:00 |
05:22:31.63 |
-36:25:45.0 |
HIP 25186 |
9.47 |
| 2026-02-20 00:00 |
05:22:30.25 |
-36:24:58.2 |
HIP 25186 |
9.49 |
| 2026-02-20 12:00 |
05:22:28.91 |
-36:24:11.3 |
HIP 25186 |
9.56 |
| 2026-02-21 00:00 |
05:22:27.61 |
-36:23:24.3 |
HIP 25186 |
9.70 |
| 2026-02-21 12:00 |
05:22:26.35 |
-36:22:37.1 |
HIP 25186 |
9.90 |
| 2026-02-22 00:00 |
05:22:25.12 |
-36:21:49.8 |
HIP 25186 |
10.15 |
| 2026-02-22 12:00 |
05:22:23.94 |
-36:21:02.4 |
HIP 25186 |
10.46 |
| 2026-02-23 00:00 |
05:22:22.79 |
-36:20:14.9 |
HIP 25186 |
10.81 |
| 2026-02-23 12:00 |
05:22:21.68 |
-36:19:27.2 |
HIP 25186 |
11.21 |
| 2026-02-24 00:00 |
05:22:20.61 |
-36:18:39.4 |
HIP 25186 |
11.64 |