메타데이터

항목	값
Designation	357P/Hill
Type	P
Perihelion (tp_cal, UTC)	2008-12-24T01:09:27.063360Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:28:34Z
Obs used	293
NEO	-
M1	5.100
K1	29.750
PC	0.030

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2009-12-05.0000000
e	0.43548563
q (au)	2.511840
a (au)	4.449560
i (deg)	6.325985
Ω (om, deg)	44.675030
ω (w, deg)	1.288453
M (ma, deg)	36.328214

밝기

산란 + 전체 선형

$$ M_a = (11.984 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목	값
H0	11.984
n	6.000
gf	1.000
gb	-0.860
k	0.998
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	21:14:27.43	-23:26:01.8	HIP 104864	33.37
2026-06-01 12:00	21:14:31.22	-23:26:44.5	HIP 104864	34.06
2026-06-02 00:00	21:14:34.76	-23:27:28.3	HIP 104864	34.79
2026-06-02 12:00	21:14:38.07	-23:28:13.2	HIP 104864	35.56
2026-06-03 00:00	21:14:41.12	-23:28:59.1	HIP 104864	36.35
2026-06-03 12:00	21:14:43.94	-23:29:46.2	HIP 104864	37.17
2026-06-04 00:00	21:14:46.50	-23:30:34.4	HIP 104864	38.02
2026-06-04 12:00	21:14:48.82	-23:31:23.6	HIP 104864	38.88
2026-06-05 00:00	21:14:50.89	-23:32:14.0	HIP 104827	38.75
2026-06-05 12:00	21:14:52.71	-23:33:05.4	HIP 104827	38.02
2026-06-06 00:00	21:14:54.28	-23:33:57.9	HIP 104827	37.26
2026-06-06 12:00	21:14:55.59	-23:34:51.6	HIP 104827	36.48
2026-06-07 00:00	21:14:56.66	-23:35:46.3	HIP 104827	35.67
2026-06-07 12:00	21:14:57.47	-23:36:42.1	HIP 104827	34.83
2026-06-08 00:00	21:14:58.03	-23:37:39.0	HIP 104827	33.97
2026-06-08 12:00	21:14:58.34	-23:38:36.9	HIP 104827	33.07
2026-06-09 00:00	21:14:58.38	-23:39:36.0	HIP 104827	32.14
2026-06-09 12:00	21:14:58.18	-23:40:36.1	HIP 104827	31.18
2026-06-10 00:00	21:14:57.71	-23:41:37.3	HIP 104827	30.19
2026-06-10 12:00	21:14:56.99	-23:42:39.5	HIP 104827	29.16
2026-06-11 00:00	21:14:56.01	-23:43:42.8	HIP 104827	28.09
2026-06-11 12:00	21:14:54.77	-23:44:47.2	HIP 104827	26.99
2026-06-12 00:00	21:14:53.28	-23:45:52.7	HIP 104827	25.85
2026-06-12 12:00	21:14:51.52	-23:46:59.1	HIP 104827	24.67
2026-06-13 00:00	21:14:49.50	-23:48:06.7	HIP 104827	23.45
2026-06-13 12:00	21:14:47.22	-23:49:15.2	HIP 104827	22.20
2026-06-14 00:00	21:14:44.68	-23:50:24.8	HIP 104827	20.91
2026-06-14 12:00	21:14:41.88	-23:51:35.4	HIP 104827	19.58
2026-06-15 00:00	21:14:38.82	-23:52:47.0	HIP 104827	18.22
2026-06-15 12:00	21:14:35.49	-23:53:59.7	HIP 104827	16.83
2026-06-16 00:00	21:14:31.91	-23:55:13.3	HIP 104827	15.41
2026-06-16 12:00	21:14:28.06	-23:56:27.9	HIP 104827	13.97
2026-06-17 00:00	21:14:23.95	-23:57:43.5	HIP 104827	12.52
2026-06-17 12:00	21:14:19.58	-23:59:00.1	HIP 104827	11.09
2026-06-18 00:00	21:14:14.95	-24:00:17.6	HIP 104827	9.68
2026-06-18 12:00	21:14:10.05	-24:01:36.0	HIP 104827	8.37
2026-06-19 00:00	21:14:04.90	-24:02:55.4	HIP 104827	7.22
2026-06-19 12:00	21:13:59.49	-24:04:15.7	HIP 104827	6.38
2026-06-20 00:00	21:13:53.81	-24:05:36.9	HIP 104827	6.02
2026-06-20 12:00	21:13:47.88	-24:06:59.1	HIP 104827	6.28
2026-06-21 00:00	21:13:41.69	-24:08:22.1	HIP 104827	7.12
2026-06-21 12:00	21:13:35.23	-24:09:46.0	HIP 104827	8.41
2026-06-22 00:00	21:13:28.52	-24:11:10.7	HIP 104827	10.02