C/2009 U3 (Hill)
메타데이터
| 항목 |
값 |
| Designation |
C/2009 U3 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-03-20T06:06:49.440960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:36Z |
| Obs used |
602 |
| NEO |
- |
| M1 |
15.400 |
| K1 |
6.000 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-01-01.0000000 |
| e |
0.99157651 |
| q (au) |
1.414425 |
| a (au) |
167.914294 |
| i (deg) |
51.260767 |
| Ω (om, deg) |
49.322883 |
| ω (w, deg) |
77.701400 |
| M (ma, deg) |
359.964553 |
밝기
산란 + 전체 선형
$$
M_a = (13.666 + 5.163\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
13.666 |
| n |
5.163 |
| gf |
1.000 |
| gb |
-0.774 |
| k |
0.984 |
| δ90 |
9.996 |
| 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 |
| 2009-10-20 |
2009-11-16 |
-11.8103 |
+4.162 |
| 2009-11-16 |
2009-12-24 |
+7.5665 |
-2.271 |
| 2009-12-24 |
2010-01-26 |
-14.8120 |
+3.624 |
| 2010-01-26 |
2010-03-19 |
+34.2691 |
-6.628 |
| 2010-03-24 |
2010-05-14 |
+6.5942 |
-1.955 |
| 2010-05-14 |
2010-06-18 |
-14.4095 |
+3.613 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
18:18:00.41 |
-62:22:01.5 |
HIP 89950 |
24.48 |
| 2026-02-03 12:00 |
18:18:06.58 |
-62:22:23.2 |
HIP 89950 |
24.00 |
| 2026-02-04 00:00 |
18:18:12.70 |
-62:22:45.2 |
HIP 89950 |
23.53 |
| 2026-02-04 12:00 |
18:18:18.78 |
-62:23:07.3 |
HIP 89950 |
23.09 |
| 2026-02-05 00:00 |
18:18:24.83 |
-62:23:29.7 |
HIP 89950 |
22.68 |
| 2026-02-05 12:00 |
18:18:30.83 |
-62:23:52.3 |
HIP 89950 |
22.30 |
| 2026-02-06 00:00 |
18:18:36.79 |
-62:24:15.1 |
HIP 89950 |
21.94 |
| 2026-02-06 12:00 |
18:18:42.71 |
-62:24:38.1 |
HIP 89950 |
21.61 |
| 2026-02-07 00:00 |
18:18:48.59 |
-62:25:01.3 |
HIP 89950 |
21.31 |
| 2026-02-07 12:00 |
18:18:54.43 |
-62:25:24.8 |
HIP 89950 |
21.04 |
| 2026-02-08 00:00 |
18:19:00.23 |
-62:25:48.4 |
HIP 89950 |
20.81 |
| 2026-02-08 12:00 |
18:19:05.98 |
-62:26:12.2 |
HIP 89950 |
20.60 |
| 2026-02-09 00:00 |
18:19:11.69 |
-62:26:36.3 |
HIP 89950 |
20.43 |
| 2026-02-09 12:00 |
18:19:17.36 |
-62:27:00.5 |
HIP 89950 |
20.30 |
| 2026-02-10 00:00 |
18:19:22.98 |
-62:27:25.0 |
HIP 89950 |
20.20 |
| 2026-02-10 12:00 |
18:19:28.56 |
-62:27:49.6 |
HIP 89950 |
20.13 |
| 2026-02-11 00:00 |
18:19:34.09 |
-62:28:14.5 |
HIP 89950 |
20.10 |
| 2026-02-11 12:00 |
18:19:39.58 |
-62:28:39.5 |
HIP 89950 |
20.11 |
| 2026-02-12 00:00 |
18:19:45.02 |
-62:29:04.8 |
HIP 89950 |
20.15 |
| 2026-02-12 12:00 |
18:19:50.41 |
-62:29:30.2 |
HIP 89950 |
20.22 |
| 2026-02-13 00:00 |
18:19:55.76 |
-62:29:55.8 |
HIP 89950 |
20.33 |
| 2026-02-13 12:00 |
18:20:01.06 |
-62:30:21.7 |
HIP 89950 |
20.47 |
| 2026-02-14 00:00 |
18:20:06.32 |
-62:30:47.7 |
HIP 89950 |
20.64 |
| 2026-02-14 12:00 |
18:20:11.53 |
-62:31:13.9 |
HIP 90087 |
20.18 |
| 2026-02-15 00:00 |
18:20:16.68 |
-62:31:40.3 |
HIP 90087 |
19.51 |
| 2026-02-15 12:00 |
18:20:21.80 |
-62:32:06.9 |
HIP 90087 |
18.85 |
| 2026-02-16 00:00 |
18:20:26.86 |
-62:32:33.6 |
HIP 90087 |
18.20 |
| 2026-02-16 12:00 |
18:20:31.87 |
-62:33:00.6 |
HIP 90087 |
17.57 |
| 2026-02-17 00:00 |
18:20:36.83 |
-62:33:27.7 |
HIP 90087 |
16.95 |
| 2026-02-17 12:00 |
18:20:41.74 |
-62:33:55.0 |
HIP 90087 |
16.34 |
| 2026-02-18 00:00 |
18:20:46.60 |
-62:34:22.5 |
HIP 90087 |
15.75 |
| 2026-02-18 12:00 |
18:20:51.41 |
-62:34:50.2 |
HIP 90087 |
15.17 |
| 2026-02-19 00:00 |
18:20:56.17 |
-62:35:18.0 |
HIP 90087 |
14.61 |
| 2026-02-19 12:00 |
18:21:00.88 |
-62:35:46.1 |
HIP 90087 |
14.08 |
| 2026-02-20 00:00 |
18:21:05.54 |
-62:36:14.3 |
HIP 90087 |
13.57 |
| 2026-02-20 12:00 |
18:21:10.14 |
-62:36:42.6 |
HIP 90087 |
13.08 |
| 2026-02-21 00:00 |
18:21:14.69 |
-62:37:11.1 |
HIP 90087 |
12.62 |
| 2026-02-21 12:00 |
18:21:19.19 |
-62:37:39.8 |
HIP 90087 |
12.20 |
| 2026-02-22 00:00 |
18:21:23.63 |
-62:38:08.7 |
HIP 90087 |
11.80 |
| 2026-02-22 12:00 |
18:21:28.03 |
-62:38:37.7 |
HIP 90087 |
11.44 |
| 2026-02-23 00:00 |
18:21:32.36 |
-62:39:06.9 |
HIP 90087 |
11.13 |
| 2026-02-23 12:00 |
18:21:36.64 |
-62:39:36.3 |
HIP 90087 |
10.85 |
| 2026-02-24 00:00 |
18:21:40.87 |
-62:40:05.8 |
HIP 90087 |
10.62 |