메타데이터

항목	값
Designation	357P/Hill
Type	P
Perihelion (tp_cal, UTC)	2008-12-24T02:12:07.588800Z
Orbit solution date (soln_date, UTC)	2026-09-04T08:42:17Z
Obs used	298
NEO	-
M1	11.600
K1	14.250
PC	0.030

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2010-01-14.0000000
e	0.43552676
q (au)	2.511847
a (au)	4.449895
i (deg)	6.325939
Ω (om, deg)	44.673428
ω (w, deg)	1.300740
M (ma, deg)	40.519448

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)
2026-09-20 00:00	20:24:31.68	-27:15:55.0	HIP 100610	19.42
2026-09-20 12:00	20:24:26.34	-27:15:16.6	HIP 100610	19.73
2026-09-21 00:00	20:24:21.30	-27:14:36.9	HIP 100610	20.16
2026-09-21 12:00	20:24:16.58	-27:13:55.9	HIP 100610	20.68
2026-09-22 00:00	20:24:12.16	-27:13:13.7	HIP 100610	21.30
2026-09-22 12:00	20:24:08.06	-27:12:30.3	HIP 100610	21.98
2026-09-23 00:00	20:24:04.26	-27:11:45.7	HIP 100610	22.72
2026-09-23 12:00	20:24:00.77	-27:11:00.0	HIP 100610	23.51
2026-09-24 00:00	20:23:57.59	-27:10:12.9	HIP 100610	24.34
2026-09-24 12:00	20:23:54.73	-27:09:24.7	HIP 100610	25.19
2026-09-25 00:00	20:23:52.17	-27:08:35.3	HIP 100566	24.84
2026-09-25 12:00	20:23:49.93	-27:07:44.8	HIP 100566	23.93
2026-09-26 00:00	20:23:47.99	-27:06:53.1	HIP 100566	23.02
2026-09-26 12:00	20:23:46.37	-27:06:00.2	HIP 100566	22.09
2026-09-27 00:00	20:23:45.06	-27:05:06.2	HIP 100566	21.16
2026-09-27 12:00	20:23:44.05	-27:04:11.1	HIP 100566	20.23
2026-09-28 00:00	20:23:43.36	-27:03:14.8	HIP 100566	19.28
2026-09-28 12:00	20:23:42.98	-27:02:17.4	HIP 100566	18.32
2026-09-29 00:00	20:23:42.92	-27:01:18.8	HIP 100566	17.34
2026-09-29 12:00	20:23:43.16	-27:00:19.2	HIP 100566	16.37
2026-09-30 00:00	20:23:43.71	-26:59:18.4	HIP 100566	15.38
2026-09-30 12:00	20:23:44.58	-26:58:16.6	HIP 100566	14.39
2026-10-01 00:00	20:23:45.75	-26:57:13.6	HIP 100566	13.41
2026-10-01 12:00	20:23:47.24	-26:56:09.6	HIP 100566	12.45
2026-10-02 00:00	20:23:49.03	-26:55:04.4	HIP 100566	11.52
2026-10-02 12:00	20:23:51.14	-26:53:58.2	HIP 100566	10.63
2026-10-03 00:00	20:23:53.56	-26:52:51.0	HIP 100566	9.84
2026-10-03 12:00	20:23:56.29	-26:51:42.6	HIP 100566	9.16
2026-10-04 00:00	20:23:59.32	-26:50:33.2	HIP 100566	8.67
2026-10-04 12:00	20:24:02.67	-26:49:22.7	HIP 100566	8.40
2026-10-05 00:00	20:24:06.33	-26:48:11.2	HIP 100566	8.41
2026-10-05 12:00	20:24:10.29	-26:46:58.6	HIP 100566	8.72
2026-10-06 00:00	20:24:14.57	-26:45:45.0	HIP 100566	9.33
2026-10-06 12:00	20:24:19.15	-26:44:30.4	HIP 100566	10.22
2026-10-07 00:00	20:24:24.04	-26:43:14.7	HIP 100566	11.34
2026-10-07 12:00	20:24:29.24	-26:41:58.0	HIP 100566	12.65
2026-10-08 00:00	20:24:34.75	-26:40:40.2	HIP 100566	14.12
2026-10-08 12:00	20:24:40.56	-26:39:21.5	HIP 100566	15.73
2026-10-09 00:00	20:24:46.68	-26:38:01.7	HIP 100765	14.60
2026-10-09 12:00	20:24:53.11	-26:36:40.9	HIP 100765	12.84
2026-10-10 00:00	20:24:59.84	-26:35:19.2	HIP 100765	11.08
2026-10-10 12:00	20:25:06.87	-26:33:56.4	HIP 100765	9.35
2026-10-11 00:00	20:25:14.21	-26:32:32.6	HIP 100765	7.74