2022MNRAS.511.2008T

Query : 2022MNRAS.511.2008T

2022MNRAS.511.2008T - Mon. Not. R. Astron. Soc., 511, 2008-2020 (2022/April-1)

A Fourier method for the determination of focus for telescopes with stars.

TAN C.Y. and SCHULZ B.

Abstract (from CDS):

We introduce a Fourier method (Fm) for the determination of best focus for telescopes with stars. Our method fits a power function, that we will derive in this paper, to a set of images taken as a function of focuser position. The best focus position is where the power is maximum. Fm was first tested with small refractor and Schmidt-Cassegrain telescopes. After the successful small telescope tests, we then tested Fm with a 2 m Ritchey-Chretien-Coude. Our tests show that Fm is immune to the problems inherent in the popular half-flux diameter method.

Abstract Copyright: © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): methods: analytical - methods: data analysis - methods: numerical

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1292 2
2 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
3 * alf Cyg sg* 20 41 25.91514 +45 16 49.2197 1.11 1.34 1.25 1.14 1.04 A2Ia 778 0
4 NGC 7023 OpC 21 01 36.9 +68 09 48           ~ 739 0
5 NAME Elephant Trunk Nebula MoC 21 36 +57.4           ~ 58 0
6 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
7 M 52 OpC 23 24 47.2 +61 35 32           ~ 200 0

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