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 |
9.961 |
| 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) |
| 2026-03-26 00:00 |
18:44:13.93 |
+11:43:15.2 |
HIP 92052 |
25.76 |
| 2026-03-26 12:00 |
18:44:15.84 |
+11:44:16.8 |
HIP 92052 |
25.92 |
| 2026-03-27 00:00 |
18:44:17.69 |
+11:45:18.4 |
HIP 91890 |
25.38 |
| 2026-03-27 12:00 |
18:44:19.47 |
+11:46:20.1 |
HIP 91890 |
24.47 |
| 2026-03-28 00:00 |
18:44:21.20 |
+11:47:21.8 |
HIP 91890 |
23.58 |
| 2026-03-28 12:00 |
18:44:22.87 |
+11:48:23.5 |
HIP 91890 |
22.70 |
| 2026-03-29 00:00 |
18:44:24.47 |
+11:49:25.2 |
HIP 91890 |
21.84 |
| 2026-03-29 12:00 |
18:44:26.02 |
+11:50:26.9 |
HIP 91890 |
21.00 |
| 2026-03-30 00:00 |
18:44:27.50 |
+11:51:28.7 |
HIP 91890 |
20.17 |
| 2026-03-30 12:00 |
18:44:28.93 |
+11:52:30.4 |
HIP 91890 |
19.37 |
| 2026-03-31 00:00 |
18:44:30.29 |
+11:53:32.1 |
HIP 91890 |
18.58 |
| 2026-03-31 12:00 |
18:44:31.60 |
+11:54:33.9 |
HIP 91890 |
17.82 |
| 2026-04-01 00:00 |
18:44:32.84 |
+11:55:35.6 |
HIP 91890 |
17.09 |
| 2026-04-01 12:00 |
18:44:34.02 |
+11:56:37.3 |
HIP 91890 |
16.39 |
| 2026-04-02 00:00 |
18:44:35.14 |
+11:57:39.0 |
HIP 91890 |
15.72 |
| 2026-04-02 12:00 |
18:44:36.21 |
+11:58:40.7 |
HIP 91890 |
15.08 |
| 2026-04-03 00:00 |
18:44:37.21 |
+11:59:42.3 |
HIP 91890 |
14.48 |
| 2026-04-03 12:00 |
18:44:38.15 |
+12:00:44.0 |
HIP 91890 |
13.93 |
| 2026-04-04 00:00 |
18:44:39.02 |
+12:01:45.6 |
HIP 91890 |
13.43 |
| 2026-04-04 12:00 |
18:44:39.84 |
+12:02:47.1 |
HIP 91890 |
12.98 |
| 2026-04-05 00:00 |
18:44:40.60 |
+12:03:48.6 |
HIP 91890 |
12.59 |
| 2026-04-05 12:00 |
18:44:41.30 |
+12:04:50.1 |
HIP 91890 |
12.26 |
| 2026-04-06 00:00 |
18:44:41.93 |
+12:05:51.5 |
HIP 91890 |
12.00 |
| 2026-04-06 12:00 |
18:44:42.50 |
+12:06:52.9 |
HIP 91890 |
11.81 |
| 2026-04-07 00:00 |
18:44:43.02 |
+12:07:54.2 |
HIP 91890 |
11.69 |
| 2026-04-07 12:00 |
18:44:43.47 |
+12:08:55.4 |
HIP 91890 |
11.65 |
| 2026-04-08 00:00 |
18:44:43.86 |
+12:09:56.6 |
HIP 91890 |
11.69 |
| 2026-04-08 12:00 |
18:44:44.19 |
+12:10:57.7 |
HIP 91890 |
11.79 |
| 2026-04-09 00:00 |
18:44:44.45 |
+12:11:58.7 |
HIP 91890 |
11.97 |
| 2026-04-09 12:00 |
18:44:44.66 |
+12:12:59.6 |
HIP 91890 |
12.22 |
| 2026-04-10 00:00 |
18:44:44.80 |
+12:14:00.5 |
HIP 91890 |
12.53 |
| 2026-04-10 12:00 |
18:44:44.89 |
+12:15:01.2 |
HIP 91890 |
12.90 |
| 2026-04-11 00:00 |
18:44:44.91 |
+12:16:01.9 |
HIP 91890 |
13.32 |
| 2026-04-11 12:00 |
18:44:44.87 |
+12:17:02.5 |
HIP 91890 |
13.79 |
| 2026-04-12 00:00 |
18:44:44.77 |
+12:18:02.9 |
HIP 91890 |
14.30 |
| 2026-04-12 12:00 |
18:44:44.61 |
+12:19:03.3 |
HIP 91890 |
14.85 |
| 2026-04-13 00:00 |
18:44:44.38 |
+12:20:03.5 |
HIP 91890 |
15.43 |
| 2026-04-13 12:00 |
18:44:44.10 |
+12:21:03.6 |
HIP 91890 |
16.04 |
| 2026-04-14 00:00 |
18:44:43.75 |
+12:22:03.6 |
HIP 91890 |
16.68 |
| 2026-04-14 12:00 |
18:44:43.34 |
+12:23:03.5 |
HIP 91890 |
17.34 |
| 2026-04-15 00:00 |
18:44:42.87 |
+12:24:03.2 |
HIP 92067 |
17.82 |
| 2026-04-15 12:00 |
18:44:42.34 |
+12:25:02.8 |
HIP 92067 |
18.19 |
| 2026-04-16 00:00 |
18:44:41.75 |
+12:26:02.3 |
HIP 92067 |
18.62 |