메타데이터

항목	값
Designation	C/2002 T7 (LINEAR)
Type	C
Perihelion (tp_cal, UTC)	2004-04-23T01:29:19.495680Z
Orbit solution date (soln_date, UTC)	2021-04-15T23:30:22Z
Obs used	4397
NEO	-
M1	7.600
K1	6.500
PC	-

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2003-11-16.0000000
e	1.00048628
q (au)	0.614546
a (au)	-1263.766985
i (deg)	160.582715
Ω (om, deg)	94.856573
ω (w, deg)	157.739084
M (ma, deg)	-0.003490

밝기

산란 + 전체 선형

$$ M_a = (6.176 + 3.575\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목	값
H0	6.176
n	3.575
gf	0.800
gb	-0.500
k	0.800
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
2001-01-14	2002-10-29	-50.9308	+42.214
2002-10-29	2004-04-22	+0.0934	-0.200
2004-04-23	2004-05-22	+11.1569	+2.707
2004-05-22	2006-03-20	-0.3710	+1.312

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

천체력

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-03-26 00:00	08:30:36.73	+07:14:22.3	HIP 41786	16.55
2026-03-26 12:00	08:30:35.30	+07:14:35.1	HIP 41786	16.93
2026-03-27 00:00	08:30:33.88	+07:14:47.8	HIP 41786	17.29
2026-03-27 12:00	08:30:32.49	+07:15:00.4	HIP 41786	17.66
2026-03-28 00:00	08:30:31.12	+07:15:13.1	HIP 41786	18.03
2026-03-28 12:00	08:30:29.76	+07:15:25.7	HIP 41786	18.39
2026-03-29 00:00	08:30:28.43	+07:15:38.2	HIP 41786	18.75
2026-03-29 12:00	08:30:27.12	+07:15:50.7	HIP 41786	19.11
2026-03-30 00:00	08:30:25.83	+07:16:03.1	HIP 41786	19.47
2026-03-30 12:00	08:30:24.57	+07:16:15.5	HIP 41786	19.82
2026-03-31 00:00	08:30:23.32	+07:16:27.8	HIP 41786	20.17
2026-03-31 12:00	08:30:22.10	+07:16:40.1	HIP 41786	20.52
2026-04-01 00:00	08:30:20.89	+07:16:52.3	HIP 41786	20.86
2026-04-01 12:00	08:30:19.71	+07:17:04.5	HIP 41786	21.20
2026-04-02 00:00	08:30:18.55	+07:17:16.6	HIP 41786	21.54
2026-04-02 12:00	08:30:17.41	+07:17:28.7	HIP 41786	21.87
2026-04-03 00:00	08:30:16.30	+07:17:40.7	HIP 41786	22.20
2026-04-03 12:00	08:30:15.20	+07:17:52.7	HIP 41786	22.53
2026-04-04 00:00	08:30:14.13	+07:18:04.6	HIP 41786	22.85
2026-04-04 12:00	08:30:13.08	+07:18:16.5	HIP 41786	23.17
2026-04-05 00:00	08:30:12.05	+07:18:28.2	HIP 41786	23.48
2026-04-05 12:00	08:30:11.04	+07:18:40.0	HIP 41786	23.79
2026-04-06 00:00	08:30:10.05	+07:18:51.7	HIP 41786	24.10
2026-04-06 12:00	08:30:09.09	+07:19:03.3	HIP 41786	24.40
2026-04-07 00:00	08:30:08.15	+07:19:14.8	HIP 41786	24.70
2026-04-07 12:00	08:30:07.23	+07:19:26.3	HIP 41786	24.99
2026-04-08 00:00	08:30:06.33	+07:19:37.7	HIP 41786	25.28
2026-04-08 12:00	08:30:05.45	+07:19:49.1	HIP 41786	25.57
2026-04-09 00:00	08:30:04.60	+07:20:00.4	HIP 41786	25.85
2026-04-09 12:00	08:30:03.77	+07:20:11.7	HIP 41786	26.12
2026-04-10 00:00	08:30:02.96	+07:20:22.8	HIP 41786	26.39
2026-04-10 12:00	08:30:02.17	+07:20:33.9	HIP 41786	26.66
2026-04-11 00:00	08:30:01.41	+07:20:45.0	HIP 41786	26.93
2026-04-11 12:00	08:30:00.67	+07:20:55.9	HIP 41786	27.18
2026-04-12 00:00	08:29:59.95	+07:21:06.9	HIP 41786	27.44
2026-04-12 12:00	08:29:59.25	+07:21:17.7	HIP 41786	27.69
2026-04-13 00:00	08:29:58.58	+07:21:28.5	HIP 41786	27.93
2026-04-13 12:00	08:29:57.93	+07:21:39.1	HIP 41786	28.17
2026-04-14 00:00	08:29:57.30	+07:21:49.8	HIP 41786	28.41
2026-04-14 12:00	08:29:56.69	+07:22:00.3	HIP 41786	28.64
2026-04-15 00:00	08:29:56.11	+07:22:10.8	HIP 41786	28.87
2026-04-15 12:00	08:29:55.55	+07:22:21.2	HIP 41532	28.97
2026-04-16 00:00	08:29:55.01	+07:22:31.5	HIP 41532	28.93