메타데이터

항목	값
Designation	C/2004 F4 (Bradfield)
Type	C
Perihelion (tp_cal, UTC)	2004-04-17T02:09:33.935040Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:30:39Z
Obs used	301
NEO	-
M1	11.300
K1	17.500
PC	0.030

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2004-06-01.0000000
e	0.99929199
q (au)	0.168266
a (au)	237.660852
i (deg)	63.164572
Ω (om, deg)	222.778071
ω (w, deg)	332.785994
M (ma, deg)	0.012081

밝기

산란 + 전체 선형

$$ M_a = (9.967 + 5.380\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목	값
H0	9.967
n	5.380
gf	0.800
gb	-0.500
k	1.000
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

잔차 (구간 선형)

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

시작일 (UTC)	끝 (UTC)	a	b
2004-04-23	2004-05-15	-5.2994	-1.665
2004-05-15	2004-05-23	+0.5100	-0.724
2004-05-23	2004-07-10	+6.7542	-0.675
2004-07-10	2004-09-01	-1.5504	+1.328

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

천체력

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-06-01 00:00	00:48:24.04	+37:27:30.1	HIP 3714	13.42
2026-06-01 12:00	00:48:25.75	+37:27:54.7	HIP 3714	13.33
2026-06-02 00:00	00:48:27.44	+37:28:19.4	HIP 3714	13.26
2026-06-02 12:00	00:48:29.11	+37:28:44.1	HIP 3714	13.20
2026-06-03 00:00	00:48:30.77	+37:29:08.7	HIP 3714	13.16
2026-06-03 12:00	00:48:32.39	+37:29:33.4	HIP 3714	13.14
2026-06-04 00:00	00:48:34.00	+37:29:58.1	HIP 3714	13.14
2026-06-04 12:00	00:48:35.59	+37:30:22.8	HIP 3714	13.15
2026-06-05 00:00	00:48:37.15	+37:30:47.4	HIP 3714	13.18
2026-06-05 12:00	00:48:38.69	+37:31:12.1	HIP 3714	13.23
2026-06-06 00:00	00:48:40.21	+37:31:36.7	HIP 3714	13.29
2026-06-06 12:00	00:48:41.70	+37:32:01.4	HIP 3714	13.37
2026-06-07 00:00	00:48:43.18	+37:32:26.0	HIP 3714	13.46
2026-06-07 12:00	00:48:44.63	+37:32:50.7	HIP 3714	13.56
2026-06-08 00:00	00:48:46.06	+37:33:15.3	HIP 3714	13.68
2026-06-08 12:00	00:48:47.46	+37:33:39.9	HIP 3714	13.81
2026-06-09 00:00	00:48:48.84	+37:34:04.5	HIP 3714	13.96
2026-06-09 12:00	00:48:50.20	+37:34:29.0	HIP 3714	14.11
2026-06-10 00:00	00:48:51.54	+37:34:53.6	HIP 3714	14.28
2026-06-10 12:00	00:48:52.85	+37:35:18.1	HIP 3714	14.45
2026-06-11 00:00	00:48:54.14	+37:35:42.6	HIP 3714	14.64
2026-06-11 12:00	00:48:55.41	+37:36:07.1	HIP 3714	14.83
2026-06-12 00:00	00:48:56.65	+37:36:31.5	HIP 3714	15.03
2026-06-12 12:00	00:48:57.87	+37:36:55.9	HIP 3714	15.24
2026-06-13 00:00	00:48:59.06	+37:37:20.3	HIP 3714	15.46
2026-06-13 12:00	00:49:00.23	+37:37:44.7	HIP 3714	15.68
2026-06-14 00:00	00:49:01.38	+37:38:09.0	HIP 3714	15.91
2026-06-14 12:00	00:49:02.50	+37:38:33.3	HIP 3714	16.14
2026-06-15 00:00	00:49:03.60	+37:38:57.5	HIP 3714	16.38
2026-06-15 12:00	00:49:04.68	+37:39:21.8	HIP 3714	16.63
2026-06-16 00:00	00:49:05.72	+37:39:45.9	HIP 3714	16.87
2026-06-16 12:00	00:49:06.75	+37:40:10.1	HIP 3714	17.12
2026-06-17 00:00	00:49:07.75	+37:40:34.1	HIP 3714	17.38
2026-06-17 12:00	00:49:08.73	+37:40:58.2	HIP 3714	17.63
2026-06-18 00:00	00:49:09.68	+37:41:22.2	HIP 3714	17.89
2026-06-18 12:00	00:49:10.60	+37:41:46.1	HIP 3714	18.15
2026-06-19 00:00	00:49:11.50	+37:42:10.0	HIP 3714	18.41
2026-06-19 12:00	00:49:12.38	+37:42:33.8	HIP 3714	18.68
2026-06-20 00:00	00:49:13.23	+37:42:57.6	HIP 3714	18.94
2026-06-20 12:00	00:49:14.06	+37:43:21.3	HIP 3714	19.21
2026-06-21 00:00	00:49:14.86	+37:43:45.0	HIP 3714	19.47
2026-06-21 12:00	00:49:15.63	+37:44:08.6	HIP 3714	19.74
2026-06-22 00:00	00:49:16.38	+37:44:32.1	HIP 3714	20.01