메타데이터
| 항목 |
값 |
| Designation |
C/2008 E1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-08-11T20:28:01.989120Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:27Z |
| Obs used |
265 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
12.000 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2008-11-20.0000000 |
| e |
0.54811137 |
| q (au) |
4.828912 |
| a (au) |
10.686066 |
| i (deg) |
35.037529 |
| Ω (om, deg) |
189.023580 |
| ω (w, deg) |
269.989090 |
| M (ma, deg) |
2.825635 |
밝기
산란 + 전체 선형
$$
M_a = (8.357 + 5.831\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.357 |
| n |
5.831 |
| gf |
1.000 |
| gb |
-0.809 |
| k |
0.800 |
| δ90 |
9.976 |
| 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 |
| 2006-11-19 |
2008-04-04 |
+45.1347 |
-31.077 |
| 2008-09-24 |
2010-04-11 |
-0.2830 |
+0.015 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
18:28:22.71 |
+13:29:46.6 |
HIP 90492 |
11.39 |
| 2026-07-29 12:00 |
18:28:17.44 |
+13:29:11.6 |
HIP 90492 |
10.20 |
| 2026-07-30 00:00 |
18:28:12.21 |
+13:28:36.2 |
HIP 90492 |
9.06 |
| 2026-07-30 12:00 |
18:28:07.02 |
+13:28:00.4 |
HIP 90492 |
8.01 |
| 2026-07-31 00:00 |
18:28:01.85 |
+13:27:24.1 |
HIP 90492 |
7.07 |
| 2026-07-31 12:00 |
18:27:56.73 |
+13:26:47.4 |
HIP 90492 |
6.29 |
| 2026-08-01 00:00 |
18:27:51.64 |
+13:26:10.2 |
HIP 90492 |
5.73 |
| 2026-08-01 12:00 |
18:27:46.58 |
+13:25:32.6 |
HIP 90492 |
5.47 |
| 2026-08-02 00:00 |
18:27:41.56 |
+13:24:54.5 |
HIP 90492 |
5.54 |
| 2026-08-02 12:00 |
18:27:36.58 |
+13:24:16.0 |
HIP 90492 |
5.93 |
| 2026-08-03 00:00 |
18:27:31.64 |
+13:23:37.1 |
HIP 90492 |
6.57 |
| 2026-08-03 12:00 |
18:27:26.73 |
+13:22:57.7 |
HIP 90492 |
7.40 |
| 2026-08-04 00:00 |
18:27:21.86 |
+13:22:18.0 |
HIP 90492 |
8.36 |
| 2026-08-04 12:00 |
18:27:17.03 |
+13:21:37.8 |
HIP 90492 |
9.41 |
| 2026-08-05 00:00 |
18:27:12.24 |
+13:20:57.2 |
HIP 90492 |
10.51 |
| 2026-08-05 12:00 |
18:27:07.49 |
+13:20:16.1 |
HIP 90492 |
11.66 |
| 2026-08-06 00:00 |
18:27:02.77 |
+13:19:34.7 |
HIP 90492 |
12.84 |
| 2026-08-06 12:00 |
18:26:58.10 |
+13:18:52.9 |
HIP 90492 |
14.04 |
| 2026-08-07 00:00 |
18:26:53.47 |
+13:18:10.6 |
HIP 90492 |
15.25 |
| 2026-08-07 12:00 |
18:26:48.88 |
+13:17:28.0 |
HIP 90492 |
16.47 |
| 2026-08-08 00:00 |
18:26:44.34 |
+13:16:44.9 |
HIP 90492 |
17.70 |
| 2026-08-08 12:00 |
18:26:39.83 |
+13:16:01.5 |
HIP 90492 |
18.93 |
| 2026-08-09 00:00 |
18:26:35.37 |
+13:15:17.6 |
HIP 90492 |
20.16 |
| 2026-08-09 12:00 |
18:26:30.95 |
+13:14:33.4 |
HIP 90492 |
21.40 |
| 2026-08-10 00:00 |
18:26:26.58 |
+13:13:48.8 |
HIP 90492 |
22.63 |
| 2026-08-10 12:00 |
18:26:22.25 |
+13:13:03.9 |
HIP 90492 |
23.86 |
| 2026-08-11 00:00 |
18:26:17.96 |
+13:12:18.5 |
HIP 90492 |
25.09 |
| 2026-08-11 12:00 |
18:26:13.72 |
+13:11:32.8 |
HIP 90492 |
26.32 |
| 2026-08-12 00:00 |
18:26:09.53 |
+13:10:46.7 |
HIP 90492 |
27.54 |
| 2026-08-12 12:00 |
18:26:05.38 |
+13:10:00.3 |
HIP 90492 |
28.77 |
| 2026-08-13 00:00 |
18:26:01.28 |
+13:09:13.5 |
HIP 90492 |
29.98 |
| 2026-08-13 12:00 |
18:25:57.22 |
+13:08:26.3 |
HIP 90492 |
31.20 |
| 2026-08-14 00:00 |
18:25:53.22 |
+13:07:38.8 |
HIP 90492 |
32.40 |
| 2026-08-14 12:00 |
18:25:49.25 |
+13:06:51.0 |
HIP 90492 |
33.61 |
| 2026-08-15 00:00 |
18:25:45.34 |
+13:06:02.8 |
HIP 90492 |
34.81 |
| 2026-08-15 12:00 |
18:25:41.48 |
+13:05:14.3 |
HIP 90492 |
36.00 |
| 2026-08-16 00:00 |
18:25:37.66 |
+13:04:25.5 |
HIP 90305 |
36.16 |
| 2026-08-16 12:00 |
18:25:33.90 |
+13:03:36.3 |
HIP 90305 |
35.32 |
| 2026-08-17 00:00 |
18:25:30.18 |
+13:02:46.8 |
HIP 90305 |
34.49 |
| 2026-08-17 12:00 |
18:25:26.51 |
+13:01:57.0 |
HIP 90305 |
33.69 |
| 2026-08-18 00:00 |
18:25:22.90 |
+13:01:06.9 |
HIP 90305 |
32.90 |
| 2026-08-18 12:00 |
18:25:19.33 |
+13:00:16.5 |
HIP 90305 |
32.13 |
| 2026-08-19 00:00 |
18:25:15.82 |
+12:59:25.8 |
HIP 90305 |
31.38 |