메타데이터
| 항목 |
값 |
| Designation |
C/2009 U5 (Grauer) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-06-22T11:50:14.052480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:37Z |
| Obs used |
182 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-02-02.0000000 |
| e |
0.99942402 |
| q (au) |
6.094240 |
| a (au) |
10580.667509 |
| i (deg) |
25.472676 |
| Ω (om, deg) |
121.174091 |
| ω (w, deg) |
23.813513 |
| M (ma, deg) |
359.999873 |
밝기
산란 + 전체 선형
$$
M_a = (10.379 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.379 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
18:24:20.16 |
-11:10:36.7 |
HIP 90244 |
13.17 |
| 2026-03-26 12:00 |
18:24:20.64 |
-11:10:26.8 |
HIP 90244 |
13.25 |
| 2026-03-27 00:00 |
18:24:21.09 |
-11:10:16.8 |
HIP 90244 |
13.34 |
| 2026-03-27 12:00 |
18:24:21.51 |
-11:10:06.9 |
HIP 90244 |
13.43 |
| 2026-03-28 00:00 |
18:24:21.89 |
-11:09:56.9 |
HIP 90244 |
13.53 |
| 2026-03-28 12:00 |
18:24:22.24 |
-11:09:47.0 |
HIP 90244 |
13.64 |
| 2026-03-29 00:00 |
18:24:22.55 |
-11:09:37.2 |
HIP 90244 |
13.75 |
| 2026-03-29 12:00 |
18:24:22.83 |
-11:09:27.3 |
HIP 90244 |
13.86 |
| 2026-03-30 00:00 |
18:24:23.07 |
-11:09:17.5 |
HIP 90244 |
13.98 |
| 2026-03-30 12:00 |
18:24:23.28 |
-11:09:07.6 |
HIP 90244 |
14.11 |
| 2026-03-31 00:00 |
18:24:23.46 |
-11:08:57.9 |
HIP 90244 |
14.24 |
| 2026-03-31 12:00 |
18:24:23.61 |
-11:08:48.1 |
HIP 90244 |
14.37 |
| 2026-04-01 00:00 |
18:24:23.72 |
-11:08:38.3 |
HIP 90244 |
14.51 |
| 2026-04-01 12:00 |
18:24:23.79 |
-11:08:28.6 |
HIP 90244 |
14.65 |
| 2026-04-02 00:00 |
18:24:23.83 |
-11:08:18.9 |
HIP 90244 |
14.79 |
| 2026-04-02 12:00 |
18:24:23.84 |
-11:08:09.3 |
HIP 90244 |
14.94 |
| 2026-04-03 00:00 |
18:24:23.82 |
-11:07:59.7 |
HIP 90244 |
15.09 |
| 2026-04-03 12:00 |
18:24:23.76 |
-11:07:50.1 |
HIP 90244 |
15.24 |
| 2026-04-04 00:00 |
18:24:23.67 |
-11:07:40.5 |
HIP 90244 |
15.40 |
| 2026-04-04 12:00 |
18:24:23.54 |
-11:07:30.9 |
HIP 90244 |
15.55 |
| 2026-04-05 00:00 |
18:24:23.38 |
-11:07:21.4 |
HIP 90244 |
15.71 |
| 2026-04-05 12:00 |
18:24:23.19 |
-11:07:12.0 |
HIP 90244 |
15.88 |
| 2026-04-06 00:00 |
18:24:22.96 |
-11:07:02.5 |
HIP 90244 |
16.05 |
| 2026-04-06 12:00 |
18:24:22.70 |
-11:06:53.1 |
HIP 90244 |
16.21 |
| 2026-04-07 00:00 |
18:24:22.40 |
-11:06:43.7 |
HIP 90244 |
16.39 |
| 2026-04-07 12:00 |
18:24:22.07 |
-11:06:34.4 |
HIP 90244 |
16.56 |
| 2026-04-08 00:00 |
18:24:21.71 |
-11:06:25.1 |
HIP 90244 |
16.74 |
| 2026-04-08 12:00 |
18:24:21.32 |
-11:06:15.9 |
HIP 90244 |
16.92 |
| 2026-04-09 00:00 |
18:24:20.89 |
-11:06:06.6 |
HIP 90244 |
17.10 |
| 2026-04-09 12:00 |
18:24:20.43 |
-11:05:57.5 |
HIP 90244 |
17.29 |
| 2026-04-10 00:00 |
18:24:19.93 |
-11:05:48.3 |
HIP 90204 |
17.23 |
| 2026-04-10 12:00 |
18:24:19.40 |
-11:05:39.2 |
HIP 90204 |
17.08 |
| 2026-04-11 00:00 |
18:24:18.84 |
-11:05:30.2 |
HIP 90204 |
16.94 |
| 2026-04-11 12:00 |
18:24:18.25 |
-11:05:21.2 |
HIP 90204 |
16.79 |
| 2026-04-12 00:00 |
18:24:17.62 |
-11:05:12.2 |
HIP 90204 |
16.65 |
| 2026-04-12 12:00 |
18:24:16.96 |
-11:05:03.3 |
HIP 90204 |
16.51 |
| 2026-04-13 00:00 |
18:24:16.26 |
-11:04:54.4 |
HIP 90204 |
16.37 |
| 2026-04-13 12:00 |
18:24:15.54 |
-11:04:45.6 |
HIP 90204 |
16.24 |
| 2026-04-14 00:00 |
18:24:14.78 |
-11:04:36.8 |
HIP 90204 |
16.11 |
| 2026-04-14 12:00 |
18:24:13.98 |
-11:04:28.0 |
HIP 90204 |
15.98 |
| 2026-04-15 00:00 |
18:24:13.16 |
-11:04:19.4 |
HIP 90204 |
15.86 |
| 2026-04-15 12:00 |
18:24:12.30 |
-11:04:10.7 |
HIP 90204 |
15.74 |
| 2026-04-16 00:00 |
18:24:11.41 |
-11:04:02.2 |
HIP 90204 |
15.63 |