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
$$
M_a = (8.103 + 5.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.103 |
| n |
5.550 |
| gf |
0.972 |
| gb |
-0.618 |
| k |
0.800 |
| δ90 |
9.039 |
| 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 |
-6.0830 |
+4.086 |
| 2010-03-31 |
2010-08-16 |
+4.8976 |
-2.662 |
| 2010-08-16 |
2011-01-28 |
-4.5458 |
+1.824 |
| 2011-01-29 |
2011-07-12 |
+1.5191 |
-0.975 |
| 2011-07-12 |
2011-12-23 |
-8.7976 |
+4.473 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
09:00:11.36 |
-75:09:07.1 |
HIP 44473 |
13.40 |
| 2026-06-03 00:00 |
09:00:18.52 |
-75:08:15.3 |
HIP 44473 |
12.99 |
| 2026-06-03 12:00 |
09:00:25.76 |
-75:07:23.6 |
HIP 44473 |
12.63 |
| 2026-06-04 00:00 |
09:00:33.09 |
-75:06:32.2 |
HIP 44473 |
12.33 |
| 2026-06-04 12:00 |
09:00:40.50 |
-75:05:41.0 |
HIP 44473 |
12.10 |
| 2026-06-05 00:00 |
09:00:48.00 |
-75:04:50.1 |
HIP 44473 |
11.93 |
| 2026-06-05 12:00 |
09:00:55.58 |
-75:03:59.3 |
HIP 44473 |
11.84 |
| 2026-06-06 00:00 |
09:01:03.25 |
-75:03:08.8 |
HIP 44473 |
11.82 |
| 2026-06-06 12:00 |
09:01:10.99 |
-75:02:18.6 |
HIP 44473 |
11.87 |
| 2026-06-07 00:00 |
09:01:18.82 |
-75:01:28.5 |
HIP 44473 |
11.99 |
| 2026-06-07 12:00 |
09:01:26.73 |
-75:00:38.8 |
HIP 44473 |
12.19 |
| 2026-06-08 00:00 |
09:01:34.72 |
-74:59:49.2 |
HIP 44473 |
12.45 |
| 2026-06-08 12:00 |
09:01:42.79 |
-74:59:00.0 |
HIP 44473 |
12.77 |
| 2026-06-09 00:00 |
09:01:50.94 |
-74:58:10.9 |
HIP 44473 |
13.15 |
| 2026-06-09 12:00 |
09:01:59.17 |
-74:57:22.1 |
HIP 44473 |
13.58 |
| 2026-06-10 00:00 |
09:02:07.47 |
-74:56:33.5 |
HIP 44473 |
14.06 |
| 2026-06-10 12:00 |
09:02:15.86 |
-74:55:45.2 |
HIP 44473 |
14.58 |
| 2026-06-11 00:00 |
09:02:24.32 |
-74:54:57.2 |
HIP 44473 |
15.14 |
| 2026-06-11 12:00 |
09:02:32.85 |
-74:54:09.5 |
HIP 44473 |
15.73 |
| 2026-06-12 00:00 |
09:02:41.46 |
-74:53:22.0 |
HIP 44473 |
16.35 |
| 2026-06-12 12:00 |
09:02:50.15 |
-74:52:34.7 |
HIP 44699 |
16.24 |
| 2026-06-13 00:00 |
09:02:58.91 |
-74:51:47.8 |
HIP 44699 |
15.39 |
| 2026-06-13 12:00 |
09:03:07.75 |
-74:51:01.1 |
HIP 44699 |
14.55 |
| 2026-06-14 00:00 |
09:03:16.65 |
-74:50:14.7 |
HIP 44699 |
13.72 |
| 2026-06-14 12:00 |
09:03:25.63 |
-74:49:28.6 |
HIP 44699 |
12.90 |
| 2026-06-15 00:00 |
09:03:34.68 |
-74:48:42.7 |
HIP 44699 |
12.11 |
| 2026-06-15 12:00 |
09:03:43.80 |
-74:47:57.2 |
HIP 44699 |
11.33 |
| 2026-06-16 00:00 |
09:03:52.99 |
-74:47:11.9 |
HIP 44699 |
10.59 |
| 2026-06-16 12:00 |
09:04:02.25 |
-74:46:27.0 |
HIP 44699 |
9.88 |
| 2026-06-17 00:00 |
09:04:11.57 |
-74:45:42.3 |
HIP 44699 |
9.21 |
| 2026-06-17 12:00 |
09:04:20.97 |
-74:44:57.9 |
HIP 44699 |
8.58 |
| 2026-06-18 00:00 |
09:04:30.43 |
-74:44:13.8 |
HIP 44699 |
8.02 |
| 2026-06-18 12:00 |
09:04:39.96 |
-74:43:30.0 |
HIP 44699 |
7.54 |
| 2026-06-19 00:00 |
09:04:49.55 |
-74:42:46.5 |
HIP 44699 |
7.15 |
| 2026-06-19 12:00 |
09:04:59.20 |
-74:42:03.3 |
HIP 44699 |
6.86 |
| 2026-06-20 00:00 |
09:05:08.92 |
-74:41:20.5 |
HIP 44699 |
6.69 |
| 2026-06-20 12:00 |
09:05:18.71 |
-74:40:37.9 |
HIP 44699 |
6.65 |
| 2026-06-21 00:00 |
09:05:28.55 |
-74:39:55.7 |
HIP 44699 |
6.74 |
| 2026-06-21 12:00 |
09:05:38.46 |
-74:39:13.7 |
HIP 44699 |
6.96 |
| 2026-06-22 00:00 |
09:05:48.42 |
-74:38:32.1 |
HIP 44699 |
7.28 |