메타데이터
| 항목 |
값 |
| Designation |
300P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-11-02T01:00:23.175360Z |
| Orbit solution date (soln_date, UTC) |
2023-11-14T12:36:26Z |
| Obs used |
148 |
| NEO |
Yes |
| M1 |
16.800 |
| K1 |
20.500 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-01-04.0000000 |
| e |
0.69162623 |
| q (au) |
0.832296 |
| a (au) |
2.698984 |
| i (deg) |
5.675932 |
| Ω (om, deg) |
95.686317 |
| ω (w, deg) |
222.865728 |
| M (ma, deg) |
292.861604 |
밝기
산란 + 전체 선형
$$
M_a = (17.367 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
17.367 |
| n |
6.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2023-02-17 |
2023-04-11 |
+15.3858 |
+0.614 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
10:00:49.95 |
+18:35:53.4 |
HIP 48936 |
35.41 |
| 2026-03-26 12:00 |
10:00:31.02 |
+18:37:08.5 |
HIP 48936 |
31.42 |
| 2026-03-27 00:00 |
10:00:12.30 |
+18:38:21.9 |
HIP 48936 |
27.69 |
| 2026-03-27 12:00 |
09:59:53.80 |
+18:39:33.8 |
HIP 48936 |
24.30 |
| 2026-03-28 00:00 |
09:59:35.53 |
+18:40:44.0 |
HIP 48936 |
21.40 |
| 2026-03-28 12:00 |
09:59:17.48 |
+18:41:52.6 |
HIP 48936 |
19.15 |
| 2026-03-29 00:00 |
09:58:59.65 |
+18:42:59.6 |
HIP 48936 |
17.75 |
| 2026-03-29 12:00 |
09:58:42.05 |
+18:44:05.0 |
HIP 48936 |
17.39 |
| 2026-03-30 00:00 |
09:58:24.68 |
+18:45:08.7 |
HIP 48936 |
18.06 |
| 2026-03-30 12:00 |
09:58:07.55 |
+18:46:10.9 |
HIP 48936 |
19.64 |
| 2026-03-31 00:00 |
09:57:50.64 |
+18:47:11.4 |
HIP 48936 |
21.88 |
| 2026-03-31 12:00 |
09:57:33.97 |
+18:48:10.3 |
HIP 48936 |
24.58 |
| 2026-04-01 00:00 |
09:57:17.54 |
+18:49:07.7 |
HIP 48670 |
24.44 |
| 2026-04-01 12:00 |
09:57:01.35 |
+18:50:03.3 |
HIP 48670 |
20.62 |
| 2026-04-02 00:00 |
09:56:45.39 |
+18:50:57.4 |
HIP 48670 |
16.92 |
| 2026-04-02 12:00 |
09:56:29.68 |
+18:51:49.9 |
HIP 48670 |
13.36 |
| 2026-04-03 00:00 |
09:56:14.21 |
+18:52:40.8 |
HIP 48670 |
10.05 |
| 2026-04-03 12:00 |
09:55:58.99 |
+18:53:30.1 |
HIP 48670 |
7.22 |
| 2026-04-04 00:00 |
09:55:44.01 |
+18:54:17.8 |
HIP 48670 |
5.52 |
| 2026-04-04 12:00 |
09:55:29.28 |
+18:55:03.9 |
HIP 48670 |
5.90 |
| 2026-04-05 00:00 |
09:55:14.79 |
+18:55:48.3 |
HIP 48670 |
7.99 |
| 2026-04-05 12:00 |
09:55:00.56 |
+18:56:31.2 |
HIP 48670 |
10.77 |
| 2026-04-06 00:00 |
09:54:46.58 |
+18:57:12.6 |
HIP 48670 |
13.78 |
| 2026-04-06 12:00 |
09:54:32.85 |
+18:57:52.3 |
HIP 48521 |
11.68 |
| 2026-04-07 00:00 |
09:54:19.37 |
+18:58:30.4 |
HIP 48521 |
8.63 |
| 2026-04-07 12:00 |
09:54:06.15 |
+18:59:07.0 |
HIP 48521 |
5.85 |
| 2026-04-08 00:00 |
09:53:53.19 |
+18:59:42.0 |
HIP 48521 |
3.77 |
| 2026-04-08 12:00 |
09:53:40.48 |
+19:00:15.4 |
HIP 48521 |
3.67 |
| 2026-04-09 00:00 |
09:53:28.03 |
+19:00:47.3 |
HIP 48521 |
5.54 |
| 2026-04-09 12:00 |
09:53:15.84 |
+19:01:17.6 |
HIP 48521 |
8.05 |
| 2026-04-10 00:00 |
09:53:03.91 |
+19:01:46.3 |
HIP 48521 |
10.70 |
| 2026-04-10 12:00 |
09:52:52.24 |
+19:02:13.5 |
HIP 48521 |
13.38 |
| 2026-04-11 00:00 |
09:52:40.84 |
+19:02:39.1 |
HIP 48521 |
16.02 |
| 2026-04-11 12:00 |
09:52:29.69 |
+19:03:03.2 |
HIP 48448 |
15.95 |
| 2026-04-12 00:00 |
09:52:18.81 |
+19:03:25.7 |
HIP 48448 |
16.16 |
| 2026-04-12 12:00 |
09:52:08.19 |
+19:03:46.7 |
HIP 48448 |
16.77 |
| 2026-04-13 00:00 |
09:51:57.84 |
+19:04:06.2 |
HIP 48448 |
17.71 |
| 2026-04-13 12:00 |
09:51:47.75 |
+19:04:24.1 |
HIP 48448 |
18.91 |
| 2026-04-14 00:00 |
09:51:37.93 |
+19:04:40.5 |
HIP 48305 |
18.14 |
| 2026-04-14 12:00 |
09:51:28.38 |
+19:04:55.4 |
HIP 48305 |
16.71 |
| 2026-04-15 00:00 |
09:51:19.09 |
+19:05:08.8 |
HIP 48305 |
15.53 |
| 2026-04-15 12:00 |
09:51:10.07 |
+19:05:20.6 |
HIP 48305 |
14.63 |
| 2026-04-16 00:00 |
09:51:01.32 |
+19:05:31.0 |
HIP 48305 |
14.03 |