메타데이터
| 항목 |
값 |
| Designation |
172P/Yeung |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-03-09T19:52:33.948480Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:18Z |
| Obs used |
794 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2013-06-05.0000000 |
| e |
0.22433762 |
| q (au) |
3.237563 |
| a (au) |
4.173933 |
| i (deg) |
11.337557 |
| Ω (om, deg) |
33.678106 |
| ω (w, deg) |
208.775652 |
| M (ma, deg) |
201.211793 |
밝기
산란 + 전체 선형
$$
M_a = (14.025 + 2.597\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.025 |
| n |
2.597 |
| gf |
0.999 |
| gb |
-0.747 |
| k |
0.986 |
| 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
찾아보기
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
18:52:49.41 |
-32:04:04.5 |
HIP 92723 |
11.84 |
| 2026-03-26 12:00 |
18:53:17.94 |
-32:05:16.3 |
HIP 92723 |
7.54 |
| 2026-03-27 00:00 |
18:53:46.24 |
-32:06:28.5 |
HIP 92723 |
7.05 |
| 2026-03-27 12:00 |
18:54:14.33 |
-32:07:41.1 |
HIP 92723 |
10.80 |
| 2026-03-28 00:00 |
18:54:42.19 |
-32:08:54.1 |
HIP 92723 |
16.01 |
| 2026-03-28 12:00 |
18:55:09.82 |
-32:10:07.5 |
HIP 92723 |
21.61 |
| 2026-03-29 00:00 |
18:55:37.23 |
-32:11:21.3 |
HIP 93009 |
18.54 |
| 2026-03-29 12:00 |
18:56:04.42 |
-32:12:35.4 |
HIP 93009 |
13.16 |
| 2026-03-30 00:00 |
18:56:31.37 |
-32:13:50.0 |
HIP 93009 |
8.50 |
| 2026-03-30 12:00 |
18:56:58.09 |
-32:15:05.0 |
HIP 93009 |
6.24 |
| 2026-03-31 00:00 |
18:57:24.58 |
-32:16:20.5 |
HIP 93009 |
8.47 |
| 2026-03-31 12:00 |
18:57:50.84 |
-32:17:36.4 |
HIP 93126 |
9.02 |
| 2026-04-01 00:00 |
18:58:16.86 |
-32:18:52.7 |
HIP 93126 |
8.35 |
| 2026-04-01 12:00 |
18:58:42.64 |
-32:20:09.5 |
HIP 93126 |
11.02 |
| 2026-04-02 00:00 |
18:59:08.19 |
-32:21:26.7 |
HIP 93289 |
13.36 |
| 2026-04-02 12:00 |
18:59:33.50 |
-32:22:44.4 |
HIP 93289 |
9.87 |
| 2026-04-03 00:00 |
18:59:58.57 |
-32:24:02.6 |
HIP 93289 |
8.78 |
| 2026-04-03 12:00 |
19:00:23.39 |
-32:25:21.2 |
HIP 93289 |
10.77 |
| 2026-04-04 00:00 |
19:00:47.97 |
-32:26:40.4 |
HIP 93289 |
14.58 |
| 2026-04-04 12:00 |
19:01:12.31 |
-32:28:00.0 |
HIP 93446 |
11.56 |
| 2026-04-05 00:00 |
19:01:36.39 |
-32:29:20.2 |
HIP 93446 |
7.35 |
| 2026-04-05 12:00 |
19:02:00.23 |
-32:30:40.9 |
HIP 93477 |
3.15 |
| 2026-04-06 00:00 |
19:02:23.82 |
-32:32:02.0 |
HIP 93477 |
2.32 |
| 2026-04-06 12:00 |
19:02:47.15 |
-32:33:23.7 |
HIP 93477 |
7.30 |
| 2026-04-07 00:00 |
19:03:10.23 |
-32:34:46.0 |
HIP 93477 |
12.32 |
| 2026-04-07 12:00 |
19:03:33.05 |
-32:36:08.7 |
HIP 93477 |
17.31 |
| 2026-04-08 00:00 |
19:03:55.62 |
-32:37:32.1 |
HIP 93477 |
22.25 |
| 2026-04-08 12:00 |
19:04:17.93 |
-32:38:55.9 |
HIP 93742 |
25.50 |
| 2026-04-09 00:00 |
19:04:39.97 |
-32:40:20.4 |
HIP 93742 |
22.23 |
| 2026-04-09 12:00 |
19:05:01.75 |
-32:41:45.4 |
HIP 93742 |
19.62 |
| 2026-04-10 00:00 |
19:05:23.27 |
-32:43:10.9 |
HIP 93742 |
17.93 |
| 2026-04-10 12:00 |
19:05:44.52 |
-32:44:37.1 |
HIP 93742 |
17.37 |
| 2026-04-11 00:00 |
19:06:05.50 |
-32:46:03.8 |
HIP 93742 |
18.01 |
| 2026-04-11 12:00 |
19:06:26.21 |
-32:47:31.1 |
HIP 93742 |
19.70 |
| 2026-04-12 00:00 |
19:06:46.65 |
-32:48:59.0 |
HIP 93955 |
19.34 |
| 2026-04-12 12:00 |
19:07:06.82 |
-32:50:27.5 |
HIP 93955 |
18.01 |
| 2026-04-13 00:00 |
19:07:26.71 |
-32:51:56.6 |
HIP 93955 |
17.78 |
| 2026-04-13 12:00 |
19:07:46.32 |
-32:53:26.3 |
HIP 94077 |
16.42 |
| 2026-04-14 00:00 |
19:08:05.65 |
-32:54:56.6 |
HIP 94077 |
12.52 |
| 2026-04-14 12:00 |
19:08:24.70 |
-32:56:27.6 |
HIP 94077 |
9.08 |
| 2026-04-15 00:00 |
19:08:43.47 |
-32:57:59.1 |
HIP 94077 |
6.73 |
| 2026-04-15 12:00 |
19:09:01.96 |
-32:59:31.3 |
HIP 94077 |
6.65 |
| 2026-04-16 00:00 |
19:09:20.16 |
-33:01:04.2 |
HIP 94077 |
8.81 |