메타데이터
| 항목 |
값 |
| Designation |
C/2009 Y1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-01-28T21:38:30.526080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:38Z |
| Obs used |
1677 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2011-01-30.0000000 |
| e |
0.99328974 |
| q (au) |
2.520495 |
| a (au) |
375.617800 |
| i (deg) |
107.316562 |
| Ω (om, deg) |
160.277046 |
| ω (w, deg) |
127.391328 |
| M (ma, deg) |
0.000149 |
밝기
산란 + 전체 선형
$$
M_a = (8.100 + 5.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.100 |
| n |
5.550 |
| gf |
0.975 |
| gb |
-0.618 |
| k |
0.800 |
| δ90 |
8.562 |
| 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 |
| 2009-12-17 |
2010-03-31 |
-6.0824 |
+4.086 |
| 2010-03-31 |
2010-08-16 |
+4.8977 |
-2.662 |
| 2010-08-16 |
2011-01-28 |
-4.5465 |
+1.824 |
| 2011-01-29 |
2011-07-12 |
+1.5201 |
-0.975 |
| 2011-07-12 |
2011-12-23 |
-8.7975 |
+4.473 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
08:56:34.88 |
-75:49:02.1 |
HIP 44189 |
14.04 |
| 2026-05-12 12:00 |
08:56:37.68 |
-75:48:03.8 |
HIP 44189 |
13.53 |
| 2026-05-13 00:00 |
08:56:40.59 |
-75:47:05.5 |
HIP 44189 |
13.07 |
| 2026-05-13 12:00 |
08:56:43.62 |
-75:46:07.3 |
HIP 44189 |
12.67 |
| 2026-05-14 00:00 |
08:56:46.76 |
-75:45:09.1 |
HIP 44189 |
12.32 |
| 2026-05-14 12:00 |
08:56:50.02 |
-75:44:11.1 |
HIP 44189 |
12.04 |
| 2026-05-15 00:00 |
08:56:53.39 |
-75:43:13.2 |
HIP 44189 |
11.82 |
| 2026-05-15 12:00 |
08:56:56.87 |
-75:42:15.3 |
HIP 44189 |
11.68 |
| 2026-05-16 00:00 |
08:57:00.47 |
-75:41:17.6 |
HIP 44189 |
11.61 |
| 2026-05-16 12:00 |
08:57:04.17 |
-75:40:19.9 |
HIP 44189 |
11.62 |
| 2026-05-17 00:00 |
08:57:07.99 |
-75:39:22.4 |
HIP 44189 |
11.71 |
| 2026-05-17 12:00 |
08:57:11.92 |
-75:38:24.9 |
HIP 44189 |
11.87 |
| 2026-05-18 00:00 |
08:57:15.95 |
-75:37:27.6 |
HIP 44189 |
12.10 |
| 2026-05-18 12:00 |
08:57:20.10 |
-75:36:30.4 |
HIP 44189 |
12.40 |
| 2026-05-19 00:00 |
08:57:24.35 |
-75:35:33.4 |
HIP 44189 |
12.76 |
| 2026-05-19 12:00 |
08:57:28.71 |
-75:34:36.4 |
HIP 44189 |
13.18 |
| 2026-05-20 00:00 |
08:57:33.18 |
-75:33:39.6 |
HIP 44189 |
13.65 |
| 2026-05-20 12:00 |
08:57:37.75 |
-75:32:42.9 |
HIP 44189 |
14.16 |
| 2026-05-21 00:00 |
08:57:42.43 |
-75:31:46.4 |
HIP 44189 |
14.72 |
| 2026-05-21 12:00 |
08:57:47.21 |
-75:30:50.0 |
HIP 44189 |
15.32 |
| 2026-05-22 00:00 |
08:57:52.09 |
-75:29:53.7 |
HIP 44189 |
15.95 |
| 2026-05-22 12:00 |
08:57:57.08 |
-75:28:57.6 |
HIP 44189 |
16.61 |
| 2026-05-23 00:00 |
08:58:02.17 |
-75:28:01.7 |
HIP 44189 |
17.29 |
| 2026-05-23 12:00 |
08:58:07.36 |
-75:27:05.9 |
HIP 44189 |
18.00 |
| 2026-05-24 00:00 |
08:58:12.65 |
-75:26:10.2 |
HIP 44189 |
18.72 |
| 2026-05-24 12:00 |
08:58:18.04 |
-75:25:14.7 |
HIP 44189 |
19.47 |
| 2026-05-25 00:00 |
08:58:23.53 |
-75:24:19.4 |
HIP 44189 |
20.23 |
| 2026-05-25 12:00 |
08:58:29.12 |
-75:23:24.3 |
HIP 44189 |
21.00 |
| 2026-05-26 00:00 |
08:58:34.81 |
-75:22:29.3 |
HIP 44189 |
21.79 |
| 2026-05-26 12:00 |
08:58:40.59 |
-75:21:34.5 |
HIP 44189 |
22.59 |
| 2026-05-27 00:00 |
08:58:46.47 |
-75:20:39.9 |
HIP 44473 |
21.91 |
| 2026-05-27 12:00 |
08:58:52.45 |
-75:19:45.4 |
HIP 44473 |
21.13 |
| 2026-05-28 00:00 |
08:58:58.52 |
-75:18:51.2 |
HIP 44473 |
20.37 |
| 2026-05-28 12:00 |
08:59:04.69 |
-75:17:57.1 |
HIP 44473 |
19.61 |
| 2026-05-29 00:00 |
08:59:10.94 |
-75:17:03.2 |
HIP 44473 |
18.88 |
| 2026-05-29 12:00 |
08:59:17.29 |
-75:16:09.5 |
HIP 44473 |
18.16 |
| 2026-05-30 00:00 |
08:59:23.74 |
-75:15:16.0 |
HIP 44473 |
17.46 |
| 2026-05-30 12:00 |
08:59:30.27 |
-75:14:22.7 |
HIP 44473 |
16.78 |
| 2026-05-31 00:00 |
08:59:36.90 |
-75:13:29.6 |
HIP 44473 |
16.13 |
| 2026-05-31 12:00 |
08:59:43.61 |
-75:12:36.7 |
HIP 44473 |
15.51 |
| 2026-06-01 00:00 |
08:59:50.42 |
-75:11:44.0 |
HIP 44473 |
14.93 |
| 2026-06-01 12:00 |
08:59:57.31 |
-75:10:51.5 |
HIP 44473 |
14.37 |
| 2026-06-02 00:00 |
09:00:04.29 |
-75:09:59.2 |
HIP 44473 |
13.86 |