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) |
| 2026-07-29 00:00 |
09:20:08.33 |
-74:03:35.4 |
HIP 45976 |
13.12 |
| 2026-07-29 12:00 |
09:20:20.99 |
-74:03:21.5 |
HIP 45976 |
12.32 |
| 2026-07-30 00:00 |
09:20:33.66 |
-74:03:08.1 |
HIP 45976 |
11.53 |
| 2026-07-30 12:00 |
09:20:46.35 |
-74:02:55.1 |
HIP 45976 |
10.76 |
| 2026-07-31 00:00 |
09:20:59.04 |
-74:02:42.5 |
HIP 45976 |
10.03 |
| 2026-07-31 12:00 |
09:21:11.75 |
-74:02:30.2 |
HIP 45976 |
9.32 |
| 2026-08-01 00:00 |
09:21:24.46 |
-74:02:18.4 |
HIP 45976 |
8.66 |
| 2026-08-01 12:00 |
09:21:37.18 |
-74:02:07.1 |
HIP 45976 |
8.05 |
| 2026-08-02 00:00 |
09:21:49.92 |
-74:01:56.1 |
HIP 45976 |
7.50 |
| 2026-08-02 12:00 |
09:22:02.66 |
-74:01:45.5 |
HIP 45976 |
7.04 |
| 2026-08-03 00:00 |
09:22:15.40 |
-74:01:35.3 |
HIP 45976 |
6.66 |
| 2026-08-03 12:00 |
09:22:28.16 |
-74:01:25.6 |
HIP 45976 |
6.40 |
| 2026-08-04 00:00 |
09:22:40.92 |
-74:01:16.2 |
HIP 45976 |
6.27 |
| 2026-08-04 12:00 |
09:22:53.68 |
-74:01:07.3 |
HIP 45976 |
6.26 |
| 2026-08-05 00:00 |
09:23:06.46 |
-74:00:58.8 |
HIP 45976 |
6.39 |
| 2026-08-05 12:00 |
09:23:19.23 |
-74:00:50.7 |
HIP 45976 |
6.65 |
| 2026-08-06 00:00 |
09:23:32.01 |
-74:00:43.0 |
HIP 45976 |
7.01 |
| 2026-08-06 12:00 |
09:23:44.80 |
-74:00:35.7 |
HIP 45976 |
7.47 |
| 2026-08-07 00:00 |
09:23:57.58 |
-74:00:28.8 |
HIP 45976 |
8.01 |
| 2026-08-07 12:00 |
09:24:10.37 |
-74:00:22.4 |
HIP 45976 |
8.61 |
| 2026-08-08 00:00 |
09:24:23.16 |
-74:00:16.3 |
HIP 45976 |
9.26 |
| 2026-08-08 12:00 |
09:24:35.95 |
-74:00:10.7 |
HIP 45976 |
9.96 |
| 2026-08-09 00:00 |
09:24:48.74 |
-74:00:05.5 |
HIP 45976 |
10.68 |
| 2026-08-09 12:00 |
09:25:01.53 |
-74:00:00.7 |
HIP 45976 |
11.43 |
| 2026-08-10 00:00 |
09:25:14.32 |
-73:59:56.3 |
HIP 45976 |
12.20 |
| 2026-08-10 12:00 |
09:25:27.11 |
-73:59:52.3 |
HIP 45976 |
12.99 |
| 2026-08-11 00:00 |
09:25:39.89 |
-73:59:48.8 |
HIP 45976 |
13.80 |
| 2026-08-11 12:00 |
09:25:52.68 |
-73:59:45.6 |
HIP 45976 |
14.61 |
| 2026-08-12 00:00 |
09:26:05.46 |
-73:59:42.9 |
HIP 45976 |
15.44 |
| 2026-08-12 12:00 |
09:26:18.23 |
-73:59:40.6 |
HIP 45976 |
16.27 |
| 2026-08-13 00:00 |
09:26:31.00 |
-73:59:38.7 |
HIP 45976 |
17.11 |
| 2026-08-13 12:00 |
09:26:43.76 |
-73:59:37.2 |
HIP 45976 |
17.95 |
| 2026-08-14 00:00 |
09:26:56.52 |
-73:59:36.2 |
HIP 45976 |
18.80 |
| 2026-08-14 12:00 |
09:27:09.27 |
-73:59:35.5 |
HIP 46679 |
18.51 |
| 2026-08-15 00:00 |
09:27:22.01 |
-73:59:35.3 |
HIP 46679 |
17.77 |
| 2026-08-15 12:00 |
09:27:34.75 |
-73:59:35.5 |
HIP 46679 |
17.04 |
| 2026-08-16 00:00 |
09:27:47.47 |
-73:59:36.1 |
HIP 46679 |
16.32 |
| 2026-08-16 12:00 |
09:28:00.19 |
-73:59:37.1 |
HIP 46679 |
15.61 |
| 2026-08-17 00:00 |
09:28:12.89 |
-73:59:38.6 |
HIP 46679 |
14.92 |
| 2026-08-17 12:00 |
09:28:25.58 |
-73:59:40.4 |
HIP 46679 |
14.24 |
| 2026-08-18 00:00 |
09:28:38.27 |
-73:59:42.7 |
HIP 46679 |
13.58 |
| 2026-08-18 12:00 |
09:28:50.94 |
-73:59:45.3 |
HIP 46679 |
12.94 |
| 2026-08-19 00:00 |
09:29:03.59 |
-73:59:48.4 |
HIP 46679 |
12.32 |