메타데이터
| 항목 |
값 |
| Designation |
151P/Helin |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-10-06T14:58:48.158400Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:49Z |
| Obs used |
420 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
21.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2010-02-22.0000000 |
| e |
0.57089385 |
| q (au) |
2.491926 |
| a (au) |
5.807247 |
| i (deg) |
4.734715 |
| Ω (om, deg) |
143.554023 |
| ω (w, deg) |
215.530383 |
| M (ma, deg) |
215.436711 |
밝기
산란 + 전체 선형
$$
M_a = (10.870 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
10.870 |
| n |
6.000 |
| gf |
0.929 |
| gb |
-0.828 |
| k |
0.997 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
14:00:58.08 |
-07:26:32.4 |
HIP 68471 |
19.71 |
| 2026-07-29 12:00 |
14:01:03.29 |
-07:27:19.7 |
HIP 68471 |
20.41 |
| 2026-07-30 00:00 |
14:01:08.62 |
-07:28:07.7 |
HIP 68471 |
21.22 |
| 2026-07-30 12:00 |
14:01:14.08 |
-07:28:56.4 |
HIP 68471 |
22.11 |
| 2026-07-31 00:00 |
14:01:19.65 |
-07:29:45.6 |
HIP 68471 |
23.10 |
| 2026-07-31 12:00 |
14:01:25.36 |
-07:30:35.4 |
HIP 68471 |
24.16 |
| 2026-08-01 00:00 |
14:01:31.18 |
-07:31:25.9 |
HIP 68471 |
25.31 |
| 2026-08-01 12:00 |
14:01:37.13 |
-07:32:16.9 |
HIP 68471 |
26.53 |
| 2026-08-02 00:00 |
14:01:43.20 |
-07:33:08.6 |
HIP 68471 |
27.82 |
| 2026-08-02 12:00 |
14:01:49.39 |
-07:34:00.8 |
HIP 68471 |
29.17 |
| 2026-08-03 00:00 |
14:01:55.70 |
-07:34:53.6 |
HIP 68471 |
30.59 |
| 2026-08-03 12:00 |
14:02:02.13 |
-07:35:47.0 |
HIP 68471 |
32.07 |
| 2026-08-04 00:00 |
14:02:08.68 |
-07:36:41.1 |
HIP 68661 |
32.90 |
| 2026-08-04 12:00 |
14:02:15.36 |
-07:37:35.6 |
HIP 68721 |
31.99 |
| 2026-08-05 00:00 |
14:02:22.15 |
-07:38:30.8 |
HIP 68721 |
31.09 |
| 2026-08-05 12:00 |
14:02:29.06 |
-07:39:26.6 |
HIP 68721 |
30.28 |
| 2026-08-06 00:00 |
14:02:36.09 |
-07:40:22.9 |
HIP 68721 |
29.55 |
| 2026-08-06 12:00 |
14:02:43.24 |
-07:41:19.8 |
HIP 68721 |
28.92 |
| 2026-08-07 00:00 |
14:02:50.51 |
-07:42:17.2 |
HIP 68721 |
28.41 |
| 2026-08-07 12:00 |
14:02:57.90 |
-07:43:15.2 |
HIP 68721 |
28.04 |
| 2026-08-08 00:00 |
14:03:05.40 |
-07:44:13.8 |
HIP 68721 |
27.80 |
| 2026-08-08 12:00 |
14:03:13.03 |
-07:45:12.9 |
HIP 68721 |
27.72 |
| 2026-08-09 00:00 |
14:03:20.77 |
-07:46:12.6 |
HIP 68721 |
27.80 |
| 2026-08-09 12:00 |
14:03:28.62 |
-07:47:12.8 |
HIP 68721 |
28.04 |
| 2026-08-10 00:00 |
14:03:36.60 |
-07:48:13.6 |
HIP 68721 |
28.45 |
| 2026-08-10 12:00 |
14:03:44.68 |
-07:49:14.9 |
HIP 68819 |
26.52 |
| 2026-08-11 00:00 |
14:03:52.89 |
-07:50:16.7 |
HIP 68819 |
24.25 |
| 2026-08-11 12:00 |
14:04:01.21 |
-07:51:19.1 |
HIP 68819 |
21.94 |
| 2026-08-12 00:00 |
14:04:09.64 |
-07:52:22.0 |
HIP 68819 |
19.61 |
| 2026-08-12 12:00 |
14:04:18.19 |
-07:53:25.4 |
HIP 68819 |
17.25 |
| 2026-08-13 00:00 |
14:04:26.85 |
-07:54:29.3 |
HIP 68819 |
14.87 |
| 2026-08-13 12:00 |
14:04:35.62 |
-07:55:33.8 |
HIP 68819 |
12.46 |
| 2026-08-14 00:00 |
14:04:44.51 |
-07:56:38.7 |
HIP 68819 |
10.02 |
| 2026-08-14 12:00 |
14:04:53.51 |
-07:57:44.2 |
HIP 68819 |
7.57 |
| 2026-08-15 00:00 |
14:05:02.62 |
-07:58:50.1 |
HIP 68819 |
5.12 |
| 2026-08-15 12:00 |
14:05:11.84 |
-07:59:56.6 |
HIP 68819 |
2.74 |
| 2026-08-16 00:00 |
14:05:21.17 |
-08:01:03.5 |
HIP 68819 |
1.32 |
| 2026-08-16 12:00 |
14:05:30.62 |
-08:02:10.9 |
HIP 68819 |
3.04 |
| 2026-08-17 00:00 |
14:05:40.17 |
-08:03:18.8 |
HIP 68819 |
5.52 |
| 2026-08-17 12:00 |
14:05:49.83 |
-08:04:27.2 |
HIP 68819 |
8.12 |
| 2026-08-18 00:00 |
14:05:59.59 |
-08:05:36.1 |
HIP 68819 |
10.77 |
| 2026-08-18 12:00 |
14:06:09.47 |
-08:06:45.4 |
HIP 68819 |
13.45 |
| 2026-08-19 00:00 |
14:06:19.45 |
-08:07:55.1 |
HIP 68819 |
16.17 |