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)
2026-09-20 00:00	14:20:16.55	-09:35:02.1	HIP 70187	21.30
2026-09-20 12:00	14:20:32.35	-09:36:32.7	HIP 70187	18.66
2026-09-21 00:00	14:20:48.22	-09:38:03.4	HIP 70187	16.65
2026-09-21 12:00	14:21:04.16	-09:39:34.2	HIP 70187	15.53
2026-09-22 00:00	14:21:20.18	-09:41:05.3	HIP 70187	15.52
2026-09-22 12:00	14:21:36.26	-09:42:36.5	HIP 70187	16.62
2026-09-23 00:00	14:21:52.41	-09:44:07.9	HIP 70187	18.65
2026-09-23 12:00	14:22:08.62	-09:45:39.4	HIP 70187	21.36
2026-09-24 00:00	14:22:24.91	-09:47:11.0	HIP 70187	24.53
2026-09-24 12:00	14:22:41.26	-09:48:42.9	HIP 70187	28.01
2026-09-25 00:00	14:22:57.68	-09:50:14.8	HIP 70187	31.71
2026-09-25 12:00	14:23:14.16	-09:51:46.9	HIP 70187	35.57
2026-09-26 00:00	14:23:30.71	-09:53:19.2	HIP 70187	39.54
2026-09-26 12:00	14:23:47.32	-09:54:51.5	HIP 70183	42.97
2026-09-27 00:00	14:24:04.00	-09:56:24.0	HIP 70183	45.31
2026-09-27 12:00	14:24:20.75	-09:57:56.6	HIP 70183	47.95
2026-09-28 00:00	14:24:37.55	-09:59:29.4	HIP 70688	44.41
2026-09-28 12:00	14:24:54.42	-10:01:02.2	HIP 70688	39.99
2026-09-29 00:00	14:25:11.35	-10:02:35.2	HIP 70688	35.55
2026-09-29 12:00	14:25:28.35	-10:04:08.3	HIP 70688	31.10
2026-09-30 00:00	14:25:45.40	-10:05:41.5	HIP 70688	26.65
2026-09-30 12:00	14:26:02.52	-10:07:14.8	HIP 70688	22.19
2026-10-01 00:00	14:26:19.69	-10:08:48.2	HIP 70688	17.73
2026-10-01 12:00	14:26:36.93	-10:10:21.6	HIP 70688	13.28
2026-10-02 00:00	14:26:54.23	-10:11:55.2	HIP 70688	8.89
2026-10-02 12:00	14:27:11.58	-10:13:28.9	HIP 70688	4.76
2026-10-03 00:00	14:27:29.00	-10:15:02.6	HIP 70688	2.77
2026-10-03 12:00	14:27:46.47	-10:16:36.5	HIP 70688	5.86
2026-10-04 00:00	14:28:04.00	-10:18:10.4	HIP 70688	10.16
2026-10-04 12:00	14:28:21.58	-10:19:44.3	HIP 70688	14.64
2026-10-05 00:00	14:28:39.23	-10:21:18.4	HIP 70867	18.03
2026-10-05 12:00	14:28:56.92	-10:22:52.5	HIP 70867	13.97
2026-10-06 00:00	14:29:14.68	-10:24:26.7	HIP 70867	10.39
2026-10-06 12:00	14:29:32.49	-10:26:00.9	HIP 70867	7.99
2026-10-07 00:00	14:29:50.35	-10:27:35.2	HIP 70867	7.94
2026-10-07 12:00	14:30:08.27	-10:29:09.5	HIP 70867	10.29
2026-10-08 00:00	14:30:26.24	-10:30:43.9	HIP 70867	13.89
2026-10-08 12:00	14:30:44.26	-10:32:18.3	HIP 70867	18.01
2026-10-09 00:00	14:31:02.34	-10:33:52.7	HIP 70867	22.37
2026-10-09 12:00	14:31:20.46	-10:35:27.2	HIP 71083	24.23
2026-10-10 00:00	14:31:38.64	-10:37:01.6	HIP 71083	20.77
2026-10-10 12:00	14:31:56.86	-10:38:36.2	HIP 71083	17.90
2026-10-11 00:00	14:32:15.14	-10:40:10.7	HIP 71083	15.96