메타데이터

항목	값
Designation	50P/Arend
Type	P
Perihelion (tp_cal, UTC)	2007-11-02T19:43:29.481600Z
Orbit solution date (soln_date, UTC)	2025-10-01T16:07:23Z
Obs used	1874
NEO	-
M1	13.900
K1	9.000
PC	-

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2011-07-01.0000000
e	0.53063813
q (au)	1.918329
a (au)	4.087100
i (deg)	19.155639
Ω (om, deg)	355.310553
ω (w, deg)	49.039728
M (ma, deg)	159.384273

밝기

산란 + 전체 선형

$$ M_a = (12.457 + 4.038\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목	값
H0	12.457
n	4.038
gf	1.000
gb	-0.998
k	1.000
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

잔차 (구간 선형)

$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$

시작일 (UTC)	끝 (UTC)	a	b
2023-08-17	2024-05-13	+13.6006	-5.552
2024-05-13	2025-05-02	-14.3888	+6.578

log10 r = log10(태양거리/AU), Δ = 지구거리(AU)

천체력

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-05-12 00:00	11:35:52.42	-01:30:43.6	HIP 56691	23.70
2026-05-12 12:00	11:35:46.52	-01:30:31.7	HIP 56691	25.15
2026-05-13 00:00	11:35:40.83	-01:30:20.9	HIP 56691	26.56
2026-05-13 12:00	11:35:35.34	-01:30:11.1	HIP 56691	27.93
2026-05-14 00:00	11:35:30.04	-01:30:02.4	HIP 56691	29.25
2026-05-14 12:00	11:35:24.94	-01:29:54.8	HIP 56691	30.52
2026-05-15 00:00	11:35:20.04	-01:29:48.2	HIP 56691	31.74
2026-05-15 12:00	11:35:15.34	-01:29:42.7	HIP 56691	32.91
2026-05-16 00:00	11:35:10.84	-01:29:38.2	HIP 56691	34.03
2026-05-16 12:00	11:35:06.54	-01:29:34.8	HIP 56691	35.11
2026-05-17 00:00	11:35:02.43	-01:29:32.5	HIP 56691	36.13
2026-05-17 12:00	11:34:58.53	-01:29:31.2	HIP 56691	37.11
2026-05-18 00:00	11:34:54.82	-01:29:31.1	HIP 56691	38.04
2026-05-18 12:00	11:34:51.30	-01:29:32.0	HIP 56691	38.91
2026-05-19 00:00	11:34:47.99	-01:29:33.9	HIP 56691	39.74
2026-05-19 12:00	11:34:44.87	-01:29:37.0	HIP 56691	40.52
2026-05-20 00:00	11:34:41.95	-01:29:41.1	HIP 56691	41.25
2026-05-20 12:00	11:34:39.22	-01:29:46.3	HIP 56691	41.94
2026-05-21 00:00	11:34:36.69	-01:29:52.5	HIP 56691	42.57
2026-05-21 12:00	11:34:34.36	-01:29:59.8	HIP 56263	42.17
2026-05-22 00:00	11:34:32.21	-01:30:08.3	HIP 56263	41.63
2026-05-22 12:00	11:34:30.27	-01:30:17.7	HIP 56263	41.12
2026-05-23 00:00	11:34:28.51	-01:30:28.3	HIP 56263	40.64
2026-05-23 12:00	11:34:26.95	-01:30:39.9	HIP 56263	40.21
2026-05-24 00:00	11:34:25.58	-01:30:52.5	HIP 56263	39.81
2026-05-24 12:00	11:34:24.40	-01:31:06.3	HIP 56263	39.45
2026-05-25 00:00	11:34:23.41	-01:31:21.0	HIP 56263	39.12
2026-05-25 12:00	11:34:22.61	-01:31:36.9	HIP 56263	38.84
2026-05-26 00:00	11:34:22.00	-01:31:53.8	HIP 56263	38.58
2026-05-26 12:00	11:34:21.58	-01:32:11.7	HIP 56263	38.37
2026-05-27 00:00	11:34:21.34	-01:32:30.8	HIP 56263	38.20
2026-05-27 12:00	11:34:21.29	-01:32:50.8	HIP 56263	38.06
2026-05-28 00:00	11:34:21.43	-01:33:11.9	HIP 56263	37.96
2026-05-28 12:00	11:34:21.76	-01:33:34.1	HIP 56263	37.91
2026-05-29 00:00	11:34:22.26	-01:33:57.3	HIP 56263	37.89
2026-05-29 12:00	11:34:22.96	-01:34:21.5	HIP 56263	37.92
2026-05-30 00:00	11:34:23.83	-01:34:46.8	HIP 56263	37.99
2026-05-30 12:00	11:34:24.89	-01:35:13.1	HIP 56263	38.10
2026-05-31 00:00	11:34:26.13	-01:35:40.4	HIP 56263	38.26
2026-05-31 12:00	11:34:27.55	-01:36:08.7	HIP 56493	38.19
2026-06-01 00:00	11:34:29.15	-01:36:38.1	HIP 56493	37.65
2026-06-01 12:00	11:34:30.93	-01:37:08.6	HIP 56493	37.08
2026-06-02 00:00	11:34:32.89	-01:37:40.0	HIP 56493	36.49