메타데이터
| 항목 |
값 |
| Designation |
C/2021 K3 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-02-02T08:11:00.119040Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:45:11Z |
| Obs used |
99 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2021-07-16.0000000 |
| e |
1.00356145 |
| q (au) |
5.230100 |
| a (au) |
-1468.531415 |
| i (deg) |
134.804408 |
| Ω (om, deg) |
114.441510 |
| ω (w, deg) |
181.948465 |
| M (ma, deg) |
-0.003526 |
밝기
산란 + 전체 선형
$$
M_a = (17.424 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.424 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.757 |
| 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) |
| 2026-07-29 00:00 |
10:53:51.12 |
-40:14:16.7 |
HIP 53307 |
4.29 |
| 2026-07-29 12:00 |
10:53:58.09 |
-40:13:22.1 |
HIP 53307 |
2.73 |
| 2026-07-30 00:00 |
10:54:05.11 |
-40:12:28.5 |
HIP 53307 |
1.28 |
| 2026-07-30 12:00 |
10:54:12.16 |
-40:11:35.7 |
HIP 53307 |
1.00 |
| 2026-07-31 00:00 |
10:54:19.27 |
-40:10:43.9 |
HIP 53307 |
2.35 |
| 2026-07-31 12:00 |
10:54:26.41 |
-40:09:52.9 |
HIP 53307 |
3.89 |
| 2026-08-01 00:00 |
10:54:33.59 |
-40:09:02.9 |
HIP 53307 |
5.47 |
| 2026-08-01 12:00 |
10:54:40.82 |
-40:08:13.8 |
HIP 53307 |
7.06 |
| 2026-08-02 00:00 |
10:54:48.08 |
-40:07:25.7 |
HIP 53307 |
8.65 |
| 2026-08-02 12:00 |
10:54:55.39 |
-40:06:38.4 |
HIP 53307 |
10.24 |
| 2026-08-03 00:00 |
10:55:02.73 |
-40:05:52.0 |
HIP 53307 |
11.83 |
| 2026-08-03 12:00 |
10:55:10.11 |
-40:05:06.6 |
HIP 53307 |
13.43 |
| 2026-08-04 00:00 |
10:55:17.53 |
-40:04:22.1 |
HIP 53307 |
15.02 |
| 2026-08-04 12:00 |
10:55:24.99 |
-40:03:38.5 |
HIP 53307 |
16.61 |
| 2026-08-05 00:00 |
10:55:32.48 |
-40:02:55.8 |
HIP 53307 |
18.20 |
| 2026-08-05 12:00 |
10:55:40.01 |
-40:02:14.0 |
HIP 53307 |
19.80 |
| 2026-08-06 00:00 |
10:55:47.58 |
-40:01:33.1 |
HIP 53307 |
21.39 |
| 2026-08-06 12:00 |
10:55:55.18 |
-40:00:53.1 |
HIP 53307 |
22.98 |
| 2026-08-07 00:00 |
10:56:02.81 |
-40:00:14.1 |
HIP 53307 |
24.57 |
| 2026-08-07 12:00 |
10:56:10.48 |
-39:59:35.9 |
HIP 53307 |
26.16 |
| 2026-08-08 00:00 |
10:56:18.18 |
-39:58:58.7 |
HIP 53647 |
26.05 |
| 2026-08-08 12:00 |
10:56:25.92 |
-39:58:22.3 |
HIP 53647 |
24.51 |
| 2026-08-09 00:00 |
10:56:33.68 |
-39:57:46.9 |
HIP 53647 |
22.98 |
| 2026-08-09 12:00 |
10:56:41.48 |
-39:57:12.4 |
HIP 53647 |
21.44 |
| 2026-08-10 00:00 |
10:56:49.31 |
-39:56:38.8 |
HIP 53647 |
19.91 |
| 2026-08-10 12:00 |
10:56:57.17 |
-39:56:06.1 |
HIP 53647 |
18.39 |
| 2026-08-11 00:00 |
10:57:05.06 |
-39:55:34.3 |
HIP 53647 |
16.88 |
| 2026-08-11 12:00 |
10:57:12.97 |
-39:55:03.4 |
HIP 53647 |
15.38 |
| 2026-08-12 00:00 |
10:57:20.92 |
-39:54:33.4 |
HIP 53647 |
13.89 |
| 2026-08-12 12:00 |
10:57:28.89 |
-39:54:04.3 |
HIP 53647 |
12.42 |
| 2026-08-13 00:00 |
10:57:36.89 |
-39:53:36.1 |
HIP 53647 |
10.99 |
| 2026-08-13 12:00 |
10:57:44.91 |
-39:53:08.8 |
HIP 53647 |
9.60 |
| 2026-08-14 00:00 |
10:57:52.96 |
-39:52:42.4 |
HIP 53647 |
8.28 |
| 2026-08-14 12:00 |
10:58:01.03 |
-39:52:16.9 |
HIP 53647 |
7.06 |
| 2026-08-15 00:00 |
10:58:09.13 |
-39:51:52.3 |
HIP 53647 |
6.01 |
| 2026-08-15 12:00 |
10:58:17.25 |
-39:51:28.5 |
HIP 53647 |
5.24 |
| 2026-08-16 00:00 |
10:58:25.40 |
-39:51:05.7 |
HIP 53647 |
4.88 |
| 2026-08-16 12:00 |
10:58:33.57 |
-39:50:43.8 |
HIP 53647 |
5.02 |
| 2026-08-17 00:00 |
10:58:41.75 |
-39:50:22.7 |
HIP 53647 |
5.62 |
| 2026-08-17 12:00 |
10:58:49.96 |
-39:50:02.5 |
HIP 53647 |
6.56 |
| 2026-08-18 00:00 |
10:58:58.19 |
-39:49:43.2 |
HIP 53718 |
5.51 |
| 2026-08-18 12:00 |
10:59:06.44 |
-39:49:24.8 |
HIP 53718 |
3.91 |
| 2026-08-19 00:00 |
10:59:14.70 |
-39:49:07.2 |
HIP 53718 |
2.33 |