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C/1978 H1 (Meier)

메타데이터

항목 값
Designation C/1978 H1 (Meier)
Type C
Perihelion (tp_cal, UTC) 1978-11-11T09:49:21.498240Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:29:26Z
Obs used 276
NEO -
M1 5.100
K1 7.250
PC -
Osculating 궤도요소
항목 값
Epoch (epoch_cal, TDB) 1978-12-13.0000000
e 1.00084968
q (au) 1.136526
a (au) -1337.595649
i (deg) 43.761381
Ω (om, deg) 349.344795
ω (w, deg) 231.402033
M (ma, deg) 0.000636

밝기

C/1978 H1 (Meier) · Magnitude (Full range)

산란 + 전체 선형

$$ M_a = (1.696 + 4.508\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목 값
H0 1.696
n 4.508
gf 1.000
gb -0.500
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
1978-04-27 1978-11-09 -2.4267 +0.754
1978-11-13 1979-12-21 -2.6793 +1.685

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

천체력

Date/Time (UTC) RA (J2000) Dec (J2000) Nearest HIP Dist from HIP (arcmin)
2026-02-03 00:00 00:21:19.15 +28:57:43.7 HIP 1690 3.85
2026-02-03 12:00 00:21:20.23 +28:57:40.8 HIP 1690 3.91
2026-02-04 00:00 00:21:21.31 +28:57:38.0 HIP 1690 3.99
2026-02-04 12:00 00:21:22.40 +28:57:35.3 HIP 1690 4.09
2026-02-05 00:00 00:21:23.51 +28:57:32.8 HIP 1690 4.20
2026-02-05 12:00 00:21:24.62 +28:57:30.3 HIP 1690 4.32
2026-02-06 00:00 00:21:25.75 +28:57:28.0 HIP 1690 4.46
2026-02-06 12:00 00:21:26.89 +28:57:25.8 HIP 1690 4.61
2026-02-07 00:00 00:21:28.04 +28:57:23.8 HIP 1690 4.78
2026-02-07 12:00 00:21:29.20 +28:57:21.8 HIP 1690 4.95
2026-02-08 00:00 00:21:30.37 +28:57:20.0 HIP 1690 5.13
2026-02-08 12:00 00:21:31.55 +28:57:18.3 HIP 1690 5.33
2026-02-09 00:00 00:21:32.74 +28:57:16.7 HIP 1690 5.53
2026-02-09 12:00 00:21:33.95 +28:57:15.2 HIP 1690 5.74
2026-02-10 00:00 00:21:35.16 +28:57:13.9 HIP 1690 5.95
2026-02-10 12:00 00:21:36.38 +28:57:12.6 HIP 1690 6.18
2026-02-11 00:00 00:21:37.62 +28:57:11.5 HIP 1690 6.41
2026-02-11 12:00 00:21:38.86 +28:57:10.5 HIP 1690 6.64
2026-02-12 00:00 00:21:40.11 +28:57:09.7 HIP 1690 6.88
2026-02-12 12:00 00:21:41.38 +28:57:08.9 HIP 1690 7.13
2026-02-13 00:00 00:21:42.65 +28:57:08.3 HIP 1690 7.38
2026-02-13 12:00 00:21:43.94 +28:57:07.8 HIP 1690 7.64
2026-02-14 00:00 00:21:45.23 +28:57:07.4 HIP 1690 7.90
2026-02-14 12:00 00:21:46.53 +28:57:07.2 HIP 1690 8.16
2026-02-15 00:00 00:21:47.84 +28:57:07.0 HIP 1690 8.43
2026-02-15 12:00 00:21:49.17 +28:57:07.0 HIP 1690 8.70
2026-02-16 00:00 00:21:50.50 +28:57:07.1 HIP 1690 8.98
2026-02-16 12:00 00:21:51.84 +28:57:07.3 HIP 1690 9.26
2026-02-17 00:00 00:21:53.19 +28:57:07.7 HIP 1690 9.54
2026-02-17 12:00 00:21:54.54 +28:57:08.1 HIP 1690 9.83
2026-02-18 00:00 00:21:55.91 +28:57:08.7 HIP 1690 10.12
2026-02-18 12:00 00:21:57.29 +28:57:09.4 HIP 1690 10.41
2026-02-19 00:00 00:21:58.67 +28:57:10.3 HIP 1690 10.70
2026-02-19 12:00 00:22:00.06 +28:57:11.2 HIP 1690 11.00
2026-02-20 00:00 00:22:01.46 +28:57:12.3 HIP 1690 11.30
2026-02-20 12:00 00:22:02.87 +28:57:13.5 HIP 1690 11.61
2026-02-21 00:00 00:22:04.29 +28:57:14.8 HIP 1690 11.91
2026-02-21 12:00 00:22:05.72 +28:57:16.2 HIP 1690 12.22
2026-02-22 00:00 00:22:07.15 +28:57:17.8 HIP 1690 12.53
2026-02-22 12:00 00:22:08.59 +28:57:19.4 HIP 1690 12.84
2026-02-23 00:00 00:22:10.04 +28:57:21.2 HIP 1690 13.16
2026-02-23 12:00 00:22:11.50 +28:57:23.1 HIP 1690 13.47
2026-02-24 00:00 00:22:12.96 +28:57:25.2 HIP 1690 13.79