메타데이터

항목	값
Designation	67P/Churyumov-Gerasimenko
Type	P
Perihelion (tp_cal, UTC)	2015-08-13T02:07:40.033920Z
Orbit solution date (soln_date, UTC)	2026-09-04T10:25:07Z
Obs used	8610
NEO	Yes
M1	12.900
K1	7.500
PC	-

Osculating 궤도요소

항목	값
Epoch (epoch_cal, TDB)	2015-10-10.0000000
e	0.64090813
q (au)	1.243266
a (au)	3.462249
i (deg)	7.040295
Ω (om, deg)	50.135574
ω (w, deg)	12.798250
M (ma, deg)	8.859927

밝기

산란 + 전체 선형

$$ M_a = (12.809 + 3.261\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목	값
H0	12.809
n	3.261
gf	0.959
gb	-0.500
k	0.800
δ90	1.384

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
2021-02-02	2023-04-26	-0.2979	-0.513

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

찾아보기

천체력

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-09-20 00:00	16:58:15.51	-25:42:34.9	HIP 82977	13.07
2026-09-20 12:00	16:58:28.42	-25:42:39.8	HIP 82977	15.73
2026-09-21 00:00	16:58:41.53	-25:42:45.0	HIP 82977	18.51
2026-09-21 12:00	16:58:54.83	-25:42:50.5	HIP 82977	21.38
2026-09-22 00:00	16:59:08.33	-25:42:56.3	HIP 83055	23.65
2026-09-22 12:00	16:59:22.03	-25:43:02.3	HIP 83055	25.22
2026-09-23 00:00	16:59:35.93	-25:43:08.6	HIP 83055	27.09
2026-09-23 12:00	16:59:50.02	-25:43:15.2	HIP 83055	29.19
2026-09-24 00:00	17:00:04.30	-25:43:22.0	HIP 83055	31.51
2026-09-24 12:00	17:00:18.78	-25:43:29.0	HIP 83301	30.46
2026-09-25 00:00	17:00:33.44	-25:43:36.3	HIP 83301	29.03
2026-09-25 12:00	17:00:48.30	-25:43:43.9	HIP 83301	27.91
2026-09-26 00:00	17:01:03.34	-25:43:51.7	HIP 83301	27.16
2026-09-26 12:00	17:01:18.58	-25:43:59.7	HIP 83301	26.82
2026-09-27 00:00	17:01:34.00	-25:44:08.0	HIP 83301	26.92
2026-09-27 12:00	17:01:49.61	-25:44:16.5	HIP 83301	27.48
2026-09-28 00:00	17:02:05.40	-25:44:25.2	HIP 83508	26.12
2026-09-28 12:00	17:02:21.38	-25:44:34.2	HIP 83508	22.56
2026-09-29 00:00	17:02:37.54	-25:44:43.4	HIP 83508	18.97
2026-09-29 12:00	17:02:53.89	-25:44:52.7	HIP 83508	15.37
2026-09-30 00:00	17:03:10.41	-25:45:02.3	HIP 83508	11.78
2026-09-30 12:00	17:03:27.12	-25:45:12.1	HIP 83508	8.29
2026-10-01 00:00	17:03:44.01	-25:45:22.1	HIP 83508	5.15
2026-10-01 12:00	17:04:01.08	-25:45:32.3	HIP 83508	3.66
2026-10-02 00:00	17:04:18.33	-25:45:42.7	HIP 83508	5.50
2026-10-02 12:00	17:04:35.76	-25:45:53.3	HIP 83566	7.39
2026-10-03 00:00	17:04:53.36	-25:46:04.0	HIP 83566	7.68
2026-10-03 12:00	17:05:11.14	-25:46:15.0	HIP 83566	9.78
2026-10-04 00:00	17:05:29.10	-25:46:26.1	HIP 83566	12.85
2026-10-04 12:00	17:05:47.23	-25:46:37.4	HIP 83566	16.39
2026-10-05 00:00	17:06:05.53	-25:46:48.8	HIP 83566	20.17
2026-10-05 12:00	17:06:24.01	-25:47:00.4	HIP 83615	22.99
2026-10-06 00:00	17:06:42.66	-25:47:12.2	HIP 83823	25.03
2026-10-06 12:00	17:07:01.49	-25:47:24.1	HIP 83823	22.83
2026-10-07 00:00	17:07:20.48	-25:47:36.2	HIP 83823	21.25
2026-10-07 12:00	17:07:39.65	-25:47:48.4	HIP 83823	20.46
2026-10-08 00:00	17:07:58.98	-25:48:00.8	HIP 83823	20.57
2026-10-08 12:00	17:08:18.48	-25:48:13.3	HIP 83823	21.60
2026-10-09 00:00	17:08:38.15	-25:48:25.9	HIP 83823	23.44
2026-10-09 12:00	17:08:57.98	-25:48:38.6	HIP 83823	25.94
2026-10-10 00:00	17:09:17.98	-25:48:51.5	HIP 83823	28.95
2026-10-10 12:00	17:09:38.14	-25:49:04.5	HIP 83823	32.34
2026-10-11 00:00	17:09:58.47	-25:49:17.5	HIP 84160	33.50