stella.util

Class FlatFinder

java.lang.Object

util.PropertyContainer

stella.util.FlatFinder

All Implemented Interfaces:

Cloneable, PropertySupplying

public class FlatFinder
extends PropertyContainer

The flat finder reads in a star catalog and prints out the remaining stellar pointings that have no entry within the quoted field-of-view. For an Rmag star, the incident flux on the detector for a tracking telescope is

 ADU=2.424e6*(D/1m)^2*eff*1/gain*(px/fwhm)^2*t*10^(-.4*(R-10)),
 

while for a telescope at rest

 ADU= 1.188e3*(D/1m)^2*eff*1/gain*eff*10^(-.4*(R-10)),
 

thus much lower, unless the pixel scale is comparable to the earth rotational velocity of 15arcsec/sec. Note that the drift-ADU do not depend on seeing or pixel scale, as it is always a integration along the -inf +inf axis of a 1-d gauss (the exposure time is always much longer compared to fwhm/v_earth, so we always get the full photon flux in one axis, is the seeing is very good, we get it faster).

Field Summary

Fields

Modifier and Type	Field and Description
private static double	DEFDESTEP Default de-step width.
private static double	DEFFOV Default field-of-view.
private static double	DEFHIGHDE Default high-de.
private static double	DEFLOWDE Default low-de.
private static double	DEFRASTEP Default ra step width.
private int[][]	field The array with possible pointings.
static String	KEY_DESTEP The step-width in de, degrees.
static String	KEY_FOV The field-of-view in degrees, plain multiple of de-step.
static String	KEY_HIGHDE The higher-limit in declination to search.
static String	KEY_LOWDE The lower-limit in declination to search.
static String	KEY_RASTEP The step-width in ra, degrees.

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

Constructors

Constructor and Description
FlatFinder(Map<String,String> prop) Constructs a new Flat finder grid.

Method Summary

Modifier and Type	Method and Description
private void	addOne(double ralow, double rahigh, int de) We use the low and high ra plus the index in de to add 1 in all affected fields.
void	applyCatalog(List<Star> cat) Applis the star catalog.
private List<Vector2D>	getUnaffectedField() Returns the Ra,De vectros of all unaffected fields.
static void	main(String[] arg) We apply the serialized catalog in the first field to the sky grid in the second.
private int	unaffected() Counts the unaffected fields.

Methods inherited from class util.PropertyContainer

augment, augment, augment, augment, augment, clone, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, initProperties, isNew, parseObject, parseObject, reload, reload, removeProperty, requires, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

KEY_LOWDE

public static final String KEY_LOWDE

The lower-limit in declination to search.

See Also:

Constant Field Values

KEY_HIGHDE

public static final String KEY_HIGHDE

The higher-limit in declination to search.

See Also:

Constant Field Values

KEY_RASTEP

public static final String KEY_RASTEP

The step-width in ra, degrees.

See Also:

Constant Field Values

KEY_DESTEP

public static final String KEY_DESTEP

The step-width in de, degrees.

See Also:

Constant Field Values

KEY_FOV

public static final String KEY_FOV

The field-of-view in degrees, plain multiple of de-step.

See Also:

Constant Field Values

DEFLOWDE

private static final double DEFLOWDE

Default low-de.

See Also:

Constant Field Values

DEFHIGHDE

private static final double DEFHIGHDE

Default high-de.

See Also:

Constant Field Values

DEFRASTEP

private static final double DEFRASTEP

Default ra step width.

See Also:

Constant Field Values

DEFDESTEP

private static final double DEFDESTEP

Default de-step width.

See Also:

Constant Field Values

DEFFOV

private static final double DEFFOV

Default field-of-view.

See Also:

Constant Field Values

field

private final int[][] field

The array with possible pointings.

Constructor Detail

FlatFinder

public FlatFinder(Map<String,String> prop)

Constructs a new Flat finder grid. Initiates the arrays with zero, does not load any catalog.

Method Detail

applyCatalog

public void applyCatalog(List<Star> cat)

Applis the star catalog. Each star adds a hit in all field it affects.

addOne

private void addOne(double ralow,
                    double rahigh,
                    int de)

We use the low and high ra plus the index in de to add 1 in all affected fields. 0<=ralow

unaffected

private int unaffected()

Counts the unaffected fields.

getUnaffectedField

private List<Vector2D> getUnaffectedField()

Returns the Ra,De vectros of all unaffected fields.

main

public static void main(String[] arg)
                 throws Exception

We apply the serialized catalog in the first field to the sky grid in the second.

Throws:

Exception