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 |
0.945 |
| 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) |
| 2026-05-12 00:00 |
14:13:06.10 |
-07:50:14.9 |
HIP 69466 |
36.56 |
| 2026-05-12 12:00 |
14:12:53.61 |
-07:49:14.0 |
HIP 69466 |
37.95 |
| 2026-05-13 00:00 |
14:12:41.17 |
-07:48:13.6 |
HIP 69466 |
39.56 |
| 2026-05-13 12:00 |
14:12:28.77 |
-07:47:13.6 |
HIP 69466 |
41.34 |
| 2026-05-14 00:00 |
14:12:16.42 |
-07:46:14.0 |
HIP 69466 |
43.28 |
| 2026-05-14 12:00 |
14:12:04.12 |
-07:45:14.9 |
HIP 69466 |
45.35 |
| 2026-05-15 00:00 |
14:11:51.88 |
-07:44:16.3 |
HIP 69133 |
44.69 |
| 2026-05-15 12:00 |
14:11:39.69 |
-07:43:18.2 |
HIP 69195 |
42.24 |
| 2026-05-16 00:00 |
14:11:27.55 |
-07:42:20.5 |
HIP 69195 |
39.70 |
| 2026-05-16 12:00 |
14:11:15.47 |
-07:41:23.3 |
HIP 69195 |
37.28 |
| 2026-05-17 00:00 |
14:11:03.46 |
-07:40:26.7 |
HIP 69195 |
34.97 |
| 2026-05-17 12:00 |
14:10:51.50 |
-07:39:30.5 |
HIP 69195 |
32.82 |
| 2026-05-18 00:00 |
14:10:39.60 |
-07:38:34.9 |
HIP 69195 |
30.85 |
| 2026-05-18 12:00 |
14:10:27.77 |
-07:37:39.8 |
HIP 69195 |
29.09 |
| 2026-05-19 00:00 |
14:10:16.01 |
-07:36:45.2 |
HIP 69195 |
27.56 |
| 2026-05-19 12:00 |
14:10:04.31 |
-07:35:51.2 |
HIP 69195 |
26.32 |
| 2026-05-20 00:00 |
14:09:52.69 |
-07:34:57.7 |
HIP 69195 |
25.39 |
| 2026-05-20 12:00 |
14:09:41.13 |
-07:34:04.8 |
HIP 69195 |
24.79 |
| 2026-05-21 00:00 |
14:09:29.64 |
-07:33:12.4 |
HIP 69195 |
24.56 |
| 2026-05-21 12:00 |
14:09:18.23 |
-07:32:20.6 |
HIP 69195 |
24.69 |
| 2026-05-22 00:00 |
14:09:06.89 |
-07:31:29.4 |
HIP 69195 |
25.17 |
| 2026-05-22 12:00 |
14:08:55.63 |
-07:30:38.8 |
HIP 69195 |
25.97 |
| 2026-05-23 00:00 |
14:08:44.45 |
-07:29:48.7 |
HIP 69195 |
27.05 |
| 2026-05-23 12:00 |
14:08:33.34 |
-07:28:59.3 |
HIP 69195 |
28.39 |
| 2026-05-24 00:00 |
14:08:22.32 |
-07:28:10.4 |
HIP 69195 |
29.93 |
| 2026-05-24 12:00 |
14:08:11.37 |
-07:27:22.2 |
HIP 69195 |
31.64 |
| 2026-05-25 00:00 |
14:08:00.51 |
-07:26:34.5 |
HIP 69195 |
33.50 |
| 2026-05-25 12:00 |
14:07:49.73 |
-07:25:47.5 |
HIP 69195 |
35.46 |
| 2026-05-26 00:00 |
14:07:39.04 |
-07:25:01.0 |
HIP 68806 |
37.28 |
| 2026-05-26 12:00 |
14:07:28.43 |
-07:24:15.3 |
HIP 68806 |
34.55 |
| 2026-05-27 00:00 |
14:07:17.92 |
-07:23:30.1 |
HIP 68806 |
31.84 |
| 2026-05-27 12:00 |
14:07:07.48 |
-07:22:45.6 |
HIP 68806 |
29.15 |
| 2026-05-28 00:00 |
14:06:57.14 |
-07:22:01.7 |
HIP 68806 |
26.49 |
| 2026-05-28 12:00 |
14:06:46.89 |
-07:21:18.4 |
HIP 68806 |
23.86 |
| 2026-05-29 00:00 |
14:06:36.74 |
-07:20:35.8 |
HIP 68806 |
21.25 |
| 2026-05-29 12:00 |
14:06:26.67 |
-07:19:53.9 |
HIP 68806 |
18.67 |
| 2026-05-30 00:00 |
14:06:16.70 |
-07:19:12.6 |
HIP 68806 |
16.12 |
| 2026-05-30 12:00 |
14:06:06.83 |
-07:18:32.0 |
HIP 68806 |
13.59 |
| 2026-05-31 00:00 |
14:05:57.05 |
-07:17:52.0 |
HIP 68806 |
11.10 |
| 2026-05-31 12:00 |
14:05:47.36 |
-07:17:12.7 |
HIP 68806 |
8.65 |
| 2026-06-01 00:00 |
14:05:37.78 |
-07:16:34.1 |
HIP 68806 |
6.25 |
| 2026-06-01 12:00 |
14:05:28.29 |
-07:15:56.2 |
HIP 68806 |
3.95 |
| 2026-06-02 00:00 |
14:05:18.91 |
-07:15:19.0 |
HIP 68806 |
2.02 |