메타데이터
| 항목 |
값 |
| Designation |
C/2013 V4 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-10-07T13:40:00.877440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:42Z |
| Obs used |
2445 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2015-08-24.0000000 |
| e |
1.00261035 |
| q (au) |
5.185419 |
| a (au) |
-1986.485935 |
| i (deg) |
67.854449 |
| Ω (om, deg) |
55.620501 |
| ω (w, deg) |
40.445881 |
| M (ma, deg) |
-0.000496 |
밝기
산란 + 전체 선형
$$
M_a = (7.035 + 2.740\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.035 |
| n |
2.740 |
| gf |
0.850 |
| gb |
-0.970 |
| k |
1.000 |
| δ90 |
6.315 |
| 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 |
15:14:37.08 |
-02:46:52.2 |
HIP 74648 |
10.64 |
| 2026-07-29 12:00 |
15:14:35.98 |
-02:47:17.2 |
HIP 74648 |
10.63 |
| 2026-07-30 00:00 |
15:14:34.92 |
-02:47:42.3 |
HIP 74648 |
10.62 |
| 2026-07-30 12:00 |
15:14:33.90 |
-02:48:07.6 |
HIP 74648 |
10.64 |
| 2026-07-31 00:00 |
15:14:32.92 |
-02:48:33.0 |
HIP 74648 |
10.66 |
| 2026-07-31 12:00 |
15:14:31.98 |
-02:48:58.7 |
HIP 74648 |
10.69 |
| 2026-08-01 00:00 |
15:14:31.08 |
-02:49:24.5 |
HIP 74648 |
10.74 |
| 2026-08-01 12:00 |
15:14:30.22 |
-02:49:50.5 |
HIP 74648 |
10.80 |
| 2026-08-02 00:00 |
15:14:29.40 |
-02:50:16.6 |
HIP 74648 |
10.87 |
| 2026-08-02 12:00 |
15:14:28.62 |
-02:50:43.0 |
HIP 74648 |
10.95 |
| 2026-08-03 00:00 |
15:14:27.89 |
-02:51:09.4 |
HIP 74648 |
11.04 |
| 2026-08-03 12:00 |
15:14:27.19 |
-02:51:36.1 |
HIP 74648 |
11.13 |
| 2026-08-04 00:00 |
15:14:26.54 |
-02:52:02.9 |
HIP 74648 |
11.24 |
| 2026-08-04 12:00 |
15:14:25.92 |
-02:52:29.9 |
HIP 74648 |
11.36 |
| 2026-08-05 00:00 |
15:14:25.35 |
-02:52:57.1 |
HIP 74648 |
11.48 |
| 2026-08-05 12:00 |
15:14:24.82 |
-02:53:24.4 |
HIP 74648 |
11.61 |
| 2026-08-06 00:00 |
15:14:24.33 |
-02:53:51.8 |
HIP 74648 |
11.75 |
| 2026-08-06 12:00 |
15:14:23.87 |
-02:54:19.5 |
HIP 74648 |
11.90 |
| 2026-08-07 00:00 |
15:14:23.46 |
-02:54:47.2 |
HIP 74648 |
12.05 |
| 2026-08-07 12:00 |
15:14:23.10 |
-02:55:15.2 |
HIP 74648 |
12.21 |
| 2026-08-08 00:00 |
15:14:22.77 |
-02:55:43.3 |
HIP 74648 |
12.38 |
| 2026-08-08 12:00 |
15:14:22.48 |
-02:56:11.5 |
HIP 74648 |
12.55 |
| 2026-08-09 00:00 |
15:14:22.24 |
-02:56:39.9 |
HIP 74648 |
12.73 |
| 2026-08-09 12:00 |
15:14:22.03 |
-02:57:08.5 |
HIP 74648 |
12.92 |
| 2026-08-10 00:00 |
15:14:21.87 |
-02:57:37.2 |
HIP 74648 |
13.11 |
| 2026-08-10 12:00 |
15:14:21.74 |
-02:58:06.0 |
HIP 74648 |
13.31 |
| 2026-08-11 00:00 |
15:14:21.66 |
-02:58:35.0 |
HIP 74648 |
13.51 |
| 2026-08-11 12:00 |
15:14:21.62 |
-02:59:04.2 |
HIP 74648 |
13.72 |
| 2026-08-12 00:00 |
15:14:21.62 |
-02:59:33.5 |
HIP 74648 |
13.94 |
| 2026-08-12 12:00 |
15:14:21.66 |
-03:00:02.9 |
HIP 74648 |
14.16 |
| 2026-08-13 00:00 |
15:14:21.75 |
-03:00:32.5 |
HIP 74648 |
14.39 |
| 2026-08-13 12:00 |
15:14:21.87 |
-03:01:02.2 |
HIP 74648 |
14.62 |
| 2026-08-14 00:00 |
15:14:22.03 |
-03:01:32.0 |
HIP 74648 |
14.86 |
| 2026-08-14 12:00 |
15:14:22.24 |
-03:02:02.0 |
HIP 74648 |
15.10 |
| 2026-08-15 00:00 |
15:14:22.48 |
-03:02:32.1 |
HIP 74648 |
15.35 |
| 2026-08-15 12:00 |
15:14:22.77 |
-03:03:02.4 |
HIP 74648 |
15.61 |
| 2026-08-16 00:00 |
15:14:23.10 |
-03:03:32.8 |
HIP 74648 |
15.87 |
| 2026-08-16 12:00 |
15:14:23.47 |
-03:04:03.3 |
HIP 74648 |
16.14 |
| 2026-08-17 00:00 |
15:14:23.87 |
-03:04:33.9 |
HIP 74648 |
16.41 |
| 2026-08-17 12:00 |
15:14:24.32 |
-03:05:04.7 |
HIP 74648 |
16.69 |
| 2026-08-18 00:00 |
15:14:24.81 |
-03:05:35.5 |
HIP 74595 |
16.30 |
| 2026-08-18 12:00 |
15:14:25.34 |
-03:06:06.5 |
HIP 74595 |
15.78 |
| 2026-08-19 00:00 |
15:14:25.91 |
-03:06:37.7 |
HIP 74595 |
15.25 |