Comet Archive

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C/2015 H2 (PANSTARRS)

메타데이터

항목 값
Designation C/2015 H2 (PANSTARRS)
Type C
Perihelion (tp_cal, UTC) 2016-09-13T06:35:06.138240Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:33:09Z
Obs used 204
NEO -
M1 11.300
K1 5.000
PC -
Osculating 궤도요소
항목 값
Epoch (epoch_cal, TDB) 2017-02-24.0000000
e 1.00351211
q (au) 4.967122
a (au) -1414.285460
i (deg) 33.705314
Ω (om, deg) 350.691893
ω (w, deg) 287.907632
M (ma, deg) 0.003034

밝기

C/2015 H2 (PANSTARRS) · Magnitude (Full range)

산란 + 전체 선형

$$ M_a = (10.029 + 2.136\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

모델 상수

항목 값
H0 10.029
n 2.136
gf 0.974
gb -0.500
k 1.000
δ90 9.982
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
2014-05-19 2016-09-08 +6.5323 -4.790
2016-11-03 2019-10-22 +0.0641 -0.234

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 01:20:14.11 +35:27:09.5 HIP 6255 19.83
2026-02-03 12:00 01:20:17.22 +35:26:54.3 HIP 6255 19.59
2026-02-04 00:00 01:20:20.39 +35:26:39.4 HIP 6255 19.37
2026-02-04 12:00 01:20:23.60 +35:26:24.9 HIP 6255 19.18
2026-02-05 00:00 01:20:26.86 +35:26:10.7 HIP 6255 19.03
2026-02-05 12:00 01:20:30.16 +35:25:57.0 HIP 6255 18.91
2026-02-06 00:00 01:20:33.52 +35:25:43.5 HIP 6255 18.82
2026-02-06 12:00 01:20:36.92 +35:25:30.5 HIP 6255 18.77
2026-02-07 00:00 01:20:40.36 +35:25:17.8 HIP 6255 18.75
2026-02-07 12:00 01:20:43.86 +35:25:05.5 HIP 6255 18.77
2026-02-08 00:00 01:20:47.40 +35:24:53.5 HIP 6255 18.83
2026-02-08 12:00 01:20:50.98 +35:24:42.0 HIP 6255 18.93
2026-02-09 00:00 01:20:54.61 +35:24:30.8 HIP 6255 19.07
2026-02-09 12:00 01:20:58.29 +35:24:19.9 HIP 6255 19.25
2026-02-10 00:00 01:21:02.01 +35:24:09.5 HIP 6255 19.47
2026-02-10 12:00 01:21:05.78 +35:23:59.4 HIP 6255 19.72
2026-02-11 00:00 01:21:09.59 +35:23:49.6 HIP 6255 20.01
2026-02-11 12:00 01:21:13.44 +35:23:40.3 HIP 6255 20.35
2026-02-12 00:00 01:21:17.34 +35:23:31.3 HIP 6255 20.71
2026-02-12 12:00 01:21:21.28 +35:23:22.7 HIP 6255 21.11
2026-02-13 00:00 01:21:25.27 +35:23:14.5 HIP 6255 21.55
2026-02-13 12:00 01:21:29.30 +35:23:06.7 HIP 6255 22.02
2026-02-14 00:00 01:21:33.37 +35:22:59.2 HIP 6255 22.52
2026-02-14 12:00 01:21:37.49 +35:22:52.2 HIP 6255 23.05
2026-02-15 00:00 01:21:41.64 +35:22:45.5 HIP 6255 23.61
2026-02-15 12:00 01:21:45.84 +35:22:39.2 HIP 6255 24.20
2026-02-16 00:00 01:21:50.08 +35:22:33.2 HIP 6255 24.82
2026-02-16 12:00 01:21:54.37 +35:22:27.7 HIP 6255 25.46
2026-02-17 00:00 01:21:58.69 +35:22:22.5 HIP 6255 26.12
2026-02-17 12:00 01:22:03.05 +35:22:17.7 HIP 6255 26.81
2026-02-18 00:00 01:22:07.46 +35:22:13.3 HIP 6255 27.52
2026-02-18 12:00 01:22:11.90 +35:22:09.3 HIP 6255 28.26
2026-02-19 00:00 01:22:16.39 +35:22:05.6 HIP 6255 29.01
2026-02-19 12:00 01:22:20.91 +35:22:02.3 HIP 6255 29.78
2026-02-20 00:00 01:22:25.47 +35:21:59.5 HIP 6255 30.57
2026-02-20 12:00 01:22:30.08 +35:21:57.0 HIP 6255 31.38
2026-02-21 00:00 01:22:34.72 +35:21:54.8 HIP 6255 32.21
2026-02-21 12:00 01:22:39.39 +35:21:53.1 HIP 6255 33.05
2026-02-22 00:00 01:22:44.11 +35:21:51.8 HIP 6255 33.90
2026-02-22 12:00 01:22:48.86 +35:21:50.8 HIP 6255 34.78
2026-02-23 00:00 01:22:53.65 +35:21:50.2 HIP 6636 35.23
2026-02-23 12:00 01:22:58.48 +35:21:50.0 HIP 6636 34.47
2026-02-24 00:00 01:23:03.34 +35:21:50.1 HIP 6636 33.72