C/2015 X2 (Catalina)
메타데이터
| 항목 |
값 |
| Designation |
C/2015 X2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-12-20T17:13:10.505280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:18Z |
| Obs used |
43 |
| NEO |
- |
| M1 |
16.100 |
| K1 |
10.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-12-12.0000000 |
| e |
0.87907924 |
| q (au) |
1.904555 |
| a (au) |
15.750441 |
| i (deg) |
72.458476 |
| Ω (om, deg) |
101.094124 |
| ω (w, deg) |
42.018183 |
| M (ma, deg) |
359.862546 |
밝기
산란 + 전체 선형
$$
M_a = (18.961 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
18.961 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
19:35:53.86 |
-40:44:08.1 |
HIP 96391 |
14.30 |
| 2026-02-03 12:00 |
19:36:01.28 |
-40:44:13.7 |
HIP 96391 |
14.53 |
| 2026-02-04 00:00 |
19:36:08.67 |
-40:44:19.5 |
HIP 96391 |
14.89 |
| 2026-02-04 12:00 |
19:36:16.05 |
-40:44:25.5 |
HIP 96391 |
15.38 |
| 2026-02-05 00:00 |
19:36:23.40 |
-40:44:31.8 |
HIP 96391 |
15.98 |
| 2026-02-05 12:00 |
19:36:30.72 |
-40:44:38.3 |
HIP 96391 |
16.67 |
| 2026-02-06 00:00 |
19:36:38.02 |
-40:44:45.1 |
HIP 96391 |
17.45 |
| 2026-02-06 12:00 |
19:36:45.30 |
-40:44:52.1 |
HIP 96391 |
18.31 |
| 2026-02-07 00:00 |
19:36:52.55 |
-40:44:59.3 |
HIP 96391 |
19.22 |
| 2026-02-07 12:00 |
19:36:59.78 |
-40:45:06.9 |
HIP 96391 |
20.19 |
| 2026-02-08 00:00 |
19:37:06.97 |
-40:45:14.6 |
HIP 96391 |
21.20 |
| 2026-02-08 12:00 |
19:37:14.15 |
-40:45:22.7 |
HIP 96391 |
22.25 |
| 2026-02-09 00:00 |
19:37:21.29 |
-40:45:30.9 |
HIP 96391 |
23.34 |
| 2026-02-09 12:00 |
19:37:28.41 |
-40:45:39.5 |
HIP 96703 |
23.92 |
| 2026-02-10 00:00 |
19:37:35.49 |
-40:45:48.2 |
HIP 96703 |
22.57 |
| 2026-02-10 12:00 |
19:37:42.55 |
-40:45:57.3 |
HIP 96703 |
21.22 |
| 2026-02-11 00:00 |
19:37:49.58 |
-40:46:06.6 |
HIP 96703 |
19.88 |
| 2026-02-11 12:00 |
19:37:56.58 |
-40:46:16.1 |
HIP 96703 |
18.55 |
| 2026-02-12 00:00 |
19:38:03.55 |
-40:46:25.9 |
HIP 96703 |
17.22 |
| 2026-02-12 12:00 |
19:38:10.49 |
-40:46:35.9 |
HIP 96703 |
15.90 |
| 2026-02-13 00:00 |
19:38:17.40 |
-40:46:46.2 |
HIP 96703 |
14.58 |
| 2026-02-13 12:00 |
19:38:24.28 |
-40:46:56.8 |
HIP 96703 |
13.26 |
| 2026-02-14 00:00 |
19:38:31.12 |
-40:47:07.6 |
HIP 96703 |
11.96 |
| 2026-02-14 12:00 |
19:38:37.93 |
-40:47:18.7 |
HIP 96703 |
10.65 |
| 2026-02-15 00:00 |
19:38:44.71 |
-40:47:30.0 |
HIP 96703 |
9.36 |
| 2026-02-15 12:00 |
19:38:51.46 |
-40:47:41.6 |
HIP 96703 |
8.07 |
| 2026-02-16 00:00 |
19:38:58.17 |
-40:47:53.5 |
HIP 96703 |
6.78 |
| 2026-02-16 12:00 |
19:39:04.85 |
-40:48:05.6 |
HIP 96703 |
5.50 |
| 2026-02-17 00:00 |
19:39:11.49 |
-40:48:17.9 |
HIP 96703 |
4.23 |
| 2026-02-17 12:00 |
19:39:18.10 |
-40:48:30.5 |
HIP 96703 |
2.96 |
| 2026-02-18 00:00 |
19:39:24.67 |
-40:48:43.4 |
HIP 96703 |
1.70 |
| 2026-02-18 12:00 |
19:39:31.21 |
-40:48:56.6 |
HIP 96703 |
0.44 |
| 2026-02-19 00:00 |
19:39:37.71 |
-40:49:10.0 |
HIP 96703 |
0.81 |
| 2026-02-19 12:00 |
19:39:44.17 |
-40:49:23.6 |
HIP 96703 |
2.05 |
| 2026-02-20 00:00 |
19:39:50.59 |
-40:49:37.5 |
HIP 96703 |
3.29 |
| 2026-02-20 12:00 |
19:39:56.98 |
-40:49:51.7 |
HIP 96766 |
3.80 |
| 2026-02-21 00:00 |
19:40:03.33 |
-40:50:06.1 |
HIP 96766 |
2.86 |
| 2026-02-21 12:00 |
19:40:09.64 |
-40:50:20.8 |
HIP 96766 |
2.21 |
| 2026-02-22 00:00 |
19:40:15.91 |
-40:50:35.8 |
HIP 96766 |
2.12 |
| 2026-02-22 12:00 |
19:40:22.14 |
-40:50:51.0 |
HIP 96766 |
2.65 |
| 2026-02-23 00:00 |
19:40:28.33 |
-40:51:06.4 |
HIP 96766 |
3.52 |
| 2026-02-23 12:00 |
19:40:34.49 |
-40:51:22.2 |
HIP 96766 |
4.54 |
| 2026-02-24 00:00 |
19:40:40.60 |
-40:51:38.1 |
HIP 96766 |
5.61 |