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) |
| 2026-03-26 00:00 |
14:32:02.18 |
-09:36:52.1 |
HIP 71118 |
11.66 |
| 2026-03-26 12:00 |
14:31:52.88 |
-09:35:49.9 |
HIP 71118 |
14.01 |
| 2026-03-27 00:00 |
14:31:43.48 |
-09:34:47.4 |
HIP 71118 |
16.44 |
| 2026-03-27 12:00 |
14:31:33.97 |
-09:33:44.5 |
HIP 71118 |
18.92 |
| 2026-03-28 00:00 |
14:31:24.36 |
-09:32:41.2 |
HIP 71118 |
21.44 |
| 2026-03-28 12:00 |
14:31:14.65 |
-09:31:37.7 |
HIP 71118 |
24.00 |
| 2026-03-29 00:00 |
14:31:04.85 |
-09:30:33.7 |
HIP 71118 |
26.60 |
| 2026-03-29 12:00 |
14:30:54.94 |
-09:29:29.4 |
HIP 71118 |
29.23 |
| 2026-03-30 00:00 |
14:30:44.94 |
-09:28:24.8 |
HIP 71118 |
31.88 |
| 2026-03-30 12:00 |
14:30:34.85 |
-09:27:19.9 |
HIP 71118 |
34.57 |
| 2026-03-31 00:00 |
14:30:24.66 |
-09:26:14.6 |
HIP 71118 |
37.28 |
| 2026-03-31 12:00 |
14:30:14.38 |
-09:25:09.1 |
HIP 71118 |
40.02 |
| 2026-04-01 00:00 |
14:30:04.01 |
-09:24:03.2 |
HIP 70784 |
42.72 |
| 2026-04-01 12:00 |
14:29:53.54 |
-09:22:57.0 |
HIP 70784 |
42.37 |
| 2026-04-02 00:00 |
14:29:42.99 |
-09:21:50.6 |
HIP 70784 |
42.21 |
| 2026-04-02 12:00 |
14:29:32.35 |
-09:20:43.8 |
HIP 70752 |
40.74 |
| 2026-04-03 00:00 |
14:29:21.62 |
-09:19:36.8 |
HIP 70752 |
38.49 |
| 2026-04-03 12:00 |
14:29:10.81 |
-09:18:29.6 |
HIP 70752 |
36.31 |
| 2026-04-04 00:00 |
14:28:59.92 |
-09:17:22.0 |
HIP 70752 |
34.24 |
| 2026-04-04 12:00 |
14:28:48.94 |
-09:16:14.2 |
HIP 70752 |
32.28 |
| 2026-04-05 00:00 |
14:28:37.88 |
-09:15:06.2 |
HIP 70752 |
30.47 |
| 2026-04-05 12:00 |
14:28:26.74 |
-09:13:57.9 |
HIP 70752 |
28.84 |
| 2026-04-06 00:00 |
14:28:15.52 |
-09:12:49.4 |
HIP 70752 |
27.44 |
| 2026-04-06 12:00 |
14:28:04.22 |
-09:11:40.7 |
HIP 70752 |
26.30 |
| 2026-04-07 00:00 |
14:27:52.85 |
-09:10:31.7 |
HIP 70752 |
25.47 |
| 2026-04-07 12:00 |
14:27:41.40 |
-09:09:22.6 |
HIP 70752 |
24.99 |
| 2026-04-08 00:00 |
14:27:29.88 |
-09:08:13.2 |
HIP 70752 |
24.87 |
| 2026-04-08 12:00 |
14:27:18.29 |
-09:07:03.7 |
HIP 70752 |
25.14 |
| 2026-04-09 00:00 |
14:27:06.63 |
-09:05:54.0 |
HIP 70752 |
25.79 |
| 2026-04-09 12:00 |
14:26:54.90 |
-09:04:44.1 |
HIP 70752 |
26.80 |
| 2026-04-10 00:00 |
14:26:43.10 |
-09:03:34.0 |
HIP 70752 |
28.13 |
| 2026-04-10 12:00 |
14:26:31.24 |
-09:02:23.8 |
HIP 70752 |
29.74 |
| 2026-04-11 00:00 |
14:26:19.31 |
-09:01:13.5 |
HIP 70752 |
31.60 |
| 2026-04-11 12:00 |
14:26:07.32 |
-09:00:03.0 |
HIP 70752 |
33.67 |
| 2026-04-12 00:00 |
14:25:55.27 |
-08:58:52.3 |
HIP 70752 |
35.92 |
| 2026-04-12 12:00 |
14:25:43.16 |
-08:57:41.6 |
HIP 70752 |
38.32 |
| 2026-04-13 00:00 |
14:25:30.99 |
-08:56:30.7 |
HIP 70302 |
36.55 |
| 2026-04-13 12:00 |
14:25:18.76 |
-08:55:19.7 |
HIP 70302 |
33.56 |
| 2026-04-14 00:00 |
14:25:06.48 |
-08:54:08.7 |
HIP 70302 |
30.60 |
| 2026-04-14 12:00 |
14:24:54.15 |
-08:52:57.5 |
HIP 70302 |
27.70 |
| 2026-04-15 00:00 |
14:24:41.76 |
-08:51:46.3 |
HIP 70302 |
24.88 |
| 2026-04-15 12:00 |
14:24:29.33 |
-08:50:35.1 |
HIP 70302 |
22.18 |
| 2026-04-16 00:00 |
14:24:16.85 |
-08:49:23.7 |
HIP 70302 |
19.64 |