메타데이터
| 항목 |
값 |
| Designation |
271P/van Houten-Lemmon |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-05T13:04:46.807680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:12Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
15.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-09-26.0000000 |
| e |
0.39067132 |
| q (au) |
4.249690 |
| a (au) |
6.974381 |
| i (deg) |
6.856107 |
| Ω (om, deg) |
9.590375 |
| ω (w, deg) |
35.088457 |
| M (ma, deg) |
344.880647 |
밝기
산란 + 전체 선형
$$
M_a = (6.721 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
6.721 |
| n |
6.000 |
| 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) |
| 2026-06-01 00:00 |
17:20:50.09 |
-30:28:07.6 |
HIP 84806 |
10.97 |
| 2026-06-01 12:00 |
17:20:38.01 |
-30:28:05.3 |
HIP 84806 |
8.43 |
| 2026-06-02 00:00 |
17:20:25.89 |
-30:28:02.5 |
HIP 84806 |
5.95 |
| 2026-06-02 12:00 |
17:20:13.75 |
-30:27:59.5 |
HIP 84806 |
3.65 |
| 2026-06-03 00:00 |
17:20:01.57 |
-30:27:56.1 |
HIP 84806 |
2.20 |
| 2026-06-03 12:00 |
17:19:49.36 |
-30:27:52.4 |
HIP 84806 |
3.19 |
| 2026-06-04 00:00 |
17:19:37.13 |
-30:27:48.3 |
HIP 84806 |
5.42 |
| 2026-06-04 12:00 |
17:19:24.87 |
-30:27:43.9 |
HIP 84806 |
7.91 |
| 2026-06-05 00:00 |
17:19:12.59 |
-30:27:39.2 |
HIP 84806 |
10.48 |
| 2026-06-05 12:00 |
17:19:00.28 |
-30:27:34.2 |
HIP 84806 |
13.09 |
| 2026-06-06 00:00 |
17:18:47.95 |
-30:27:28.8 |
HIP 84806 |
15.71 |
| 2026-06-06 12:00 |
17:18:35.60 |
-30:27:23.1 |
HIP 84806 |
18.35 |
| 2026-06-07 00:00 |
17:18:23.24 |
-30:27:17.0 |
HIP 84542 |
19.25 |
| 2026-06-07 12:00 |
17:18:10.85 |
-30:27:10.7 |
HIP 84542 |
16.74 |
| 2026-06-08 00:00 |
17:17:58.46 |
-30:27:04.0 |
HIP 84542 |
14.28 |
| 2026-06-08 12:00 |
17:17:46.04 |
-30:26:57.0 |
HIP 84542 |
11.92 |
| 2026-06-09 00:00 |
17:17:33.62 |
-30:26:49.6 |
HIP 84542 |
9.71 |
| 2026-06-09 12:00 |
17:17:21.18 |
-30:26:41.9 |
HIP 84542 |
7.80 |
| 2026-06-10 00:00 |
17:17:08.74 |
-30:26:33.9 |
HIP 84533 |
6.30 |
| 2026-06-10 12:00 |
17:16:56.29 |
-30:26:25.6 |
HIP 84533 |
5.36 |
| 2026-06-11 00:00 |
17:16:43.83 |
-30:26:17.0 |
HIP 84533 |
5.67 |
| 2026-06-11 12:00 |
17:16:31.37 |
-30:26:08.0 |
HIP 84533 |
7.07 |
| 2026-06-12 00:00 |
17:16:18.91 |
-30:25:58.7 |
HIP 84533 |
9.07 |
| 2026-06-12 12:00 |
17:16:06.44 |
-30:25:49.1 |
HIP 84533 |
11.36 |
| 2026-06-13 00:00 |
17:15:53.98 |
-30:25:39.2 |
HIP 84445 |
13.03 |
| 2026-06-13 12:00 |
17:15:41.52 |
-30:25:29.0 |
HIP 84445 |
13.02 |
| 2026-06-14 00:00 |
17:15:29.06 |
-30:25:18.4 |
HIP 84445 |
13.55 |
| 2026-06-14 12:00 |
17:15:16.61 |
-30:25:07.5 |
HIP 84445 |
14.57 |
| 2026-06-15 00:00 |
17:15:04.17 |
-30:24:56.4 |
HIP 84445 |
15.97 |
| 2026-06-15 12:00 |
17:14:51.74 |
-30:24:44.9 |
HIP 84445 |
17.67 |
| 2026-06-16 00:00 |
17:14:39.31 |
-30:24:33.1 |
HIP 84252 |
18.42 |
| 2026-06-16 12:00 |
17:14:26.91 |
-30:24:21.0 |
HIP 84252 |
16.12 |
| 2026-06-17 00:00 |
17:14:14.51 |
-30:24:08.6 |
HIP 84252 |
13.97 |
| 2026-06-17 12:00 |
17:14:02.13 |
-30:23:55.9 |
HIP 84252 |
12.04 |
| 2026-06-18 00:00 |
17:13:49.77 |
-30:23:42.9 |
HIP 84252 |
10.45 |
| 2026-06-18 12:00 |
17:13:37.44 |
-30:23:29.6 |
HIP 84252 |
9.38 |
| 2026-06-19 00:00 |
17:13:25.12 |
-30:23:16.0 |
HIP 84252 |
8.99 |
| 2026-06-19 12:00 |
17:13:12.82 |
-30:23:02.1 |
HIP 84252 |
9.39 |
| 2026-06-20 00:00 |
17:13:00.55 |
-30:22:48.0 |
HIP 84252 |
10.47 |
| 2026-06-20 12:00 |
17:12:48.31 |
-30:22:33.5 |
HIP 84252 |
12.05 |
| 2026-06-21 00:00 |
17:12:36.09 |
-30:22:18.8 |
HIP 84126 |
9.75 |
| 2026-06-21 12:00 |
17:12:23.91 |
-30:22:03.7 |
HIP 84126 |
7.51 |
| 2026-06-22 00:00 |
17:12:11.75 |
-30:21:48.4 |
HIP 84126 |
5.63 |