net.grelf.astro

Class Star

java.lang.Object

net.grelf.astro.Star

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable

public class Star
extends java.lang.Object
implements java.lang.Cloneable, java.io.Serializable

A star can have several ids, from different catalogues. The commonId is for the brightest stars, comprising the constellation abbreviation and Flamsteed number and/or Bayer letter. If the user enters a reference of their own it is held in the otherId field.

9.12.20: Enabled star to have multiple magnitudes in different bands, held in a list.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static long	serialVersionUID
protected double	xdd Recalculated for different star charts.
protected double	zdd Recalculated for different star charts.

Constructor Summary

Constructors

Constructor and Description
Star() Set the fields individually after construction, if you really must.
Star(java.lang.String commonId, java.lang.String hipparcosId, java.lang.String tychoId, RA ra, Dec dec, Epoch epoch, Magnitude magnitude, Variability variability) Generally two of the ids passed in will be expected to be null; they may get set after construction.
Star(java.lang.String commonId, java.lang.String hipparcosId, java.lang.String tychoId, RA ra, Dec dec, Epoch epoch, Magnitude magnitude, Variability variability, double xdd, double zdd) Generally two of the ids passed in will be expected to be null.
Star(java.lang.String commonId, java.lang.String hipparcosId, java.lang.String tychoId, RA ra, Dec dec, Epoch epoch, Magnitude magnitude, Variability variability, ProperMotion pm) Generally two of the ids passed in will be expected to be null; they may get set after construction.
Star(java.lang.String commonId, java.lang.String hipparcosId, java.lang.String tychoId, RA ra, Dec dec, Epoch epoch, Magnitude magnitude, Variability variability, ProperMotion pm, double xdd, double zdd) Generally two of the ids passed in will be expected to be null.

Method Summary

Modifier and Type	Method and Description
void	addMagnitude(Magnitude m) Add another magnitude for this star.
protected MeasuredValue	calibrateImage(java.util.List<BlobMeas> refBlobs) Uses known celestial coordinates of refBlobs (from a StarChart: every BlobMeas must have a Star) to return scale factor in degrees per pixel.
void	changeEpoch(Epoch newEquinox, JulianDate newEpoch) This adjusts the fields of the current object to the given new equinox (eg, J2000) and epoch (eg, JD now) by first applying proper motion for the new epoch and then calling SkyPoint.changeEpoch (equinox) on the resulting position.
Star	clone() Returns a new Star object with the same data.
boolean	equals(java.lang.Object other) Does not involve the fields xdd and zdd because a given star may be plotted in different positions on different StarCharts.
protected SkyPoint	estimatePlateCentre(java.util.List<BlobMeas> refBlobs, Image image, Epoch epoch, MeasuredValue degreesPerPixel)
java.lang.String	getCommonId() Comprising the constellation abbreviation and Flamsteed number and/or Bayer letter (only brightest stars have these).
java.lang.String	getHipparcosId()
java.lang.String	getId() If the star has a commonId return that; otherwise if it has a hipparcosId return that; otherwise if it has a tychoId return that; otherwise if it has an otherId return that; otherwise return an empty string.
Magnitude	getMagnitude() Get the "principal" magnitude.
Magnitude	getMagnitude(java.lang.String bandId) Get the magnitude with given band id, or null if not found.
java.util.List<Magnitude>	getMagnitudes() Get the list of magnitudes
java.lang.String	getOtherId()
java.awt.Point	getPlotPoint()
SkyPoint	getPosition() If the star's position is unknown this returns null.
ProperMotion	getProperMotion() If the star's proper motion is unknown this returns a ProperMotion object in which both components are zero.
java.lang.String	getTychoId()
java.lang.String	getTypeOfStellarObject()
Variability	getVariability() If the star's variability is unknown this returns null, not a special value.
int	hashCode() Enable objects of this class to be used as hash keys.
SkyPoint	measurePosition(ImFrame parentFrame, BlobMeasList measList) If this star has unknown position (RA/Dec), do astrometry using the known reference stars in the given MeasList.
void	setCommonId(java.lang.String id)
void	setHipparcosId(java.lang.String id)
void	setMagnitude(Magnitude m) For entering a manual magnitude value to replace all others (as in BlobMenu).
void	setOtherId(java.lang.String id) For user-entered reference of their own devising.
void	setPlotPoint(java.awt.Point pt) Set by StarChart when first plotting the star.
void	setPosition(SkyPoint pt)
void	setProperMotion(ProperMotion pm)
void	setTychoId(java.lang.String id)
void	setTypeOfStellarObject(java.lang.String type) Some data sources will provide some kind of description to be set here.
void	setVariability(Variability v)
java.lang.String	toFoldedString() More detailed and more suitable for display to the user - reasonably formatted multi-line text, using "\n" as the line feed character.
java.lang.String	toFoldedString(java.lang.String lineFeed) The lineFeed might be "\n" or " " etc.
java.lang.String	toString() Simplified summary
java.lang.StringBuffer	toXML(java.lang.String indent) The indent string would typically contain some tab characters (\t).

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

xdd

protected transient double xdd

Recalculated for different star charts.

zdd

protected transient double zdd

Recalculated for different star charts.

Constructor Detail

Star

public Star(java.lang.String commonId,
            java.lang.String hipparcosId,
            java.lang.String tychoId,
            RA ra,
            Dec dec,
            Epoch epoch,
            Magnitude magnitude,
            Variability variability)

Generally two of the ids passed in will be expected to be null; they may get set after construction. If magnitude or variability are unknown enter null for each.

Star

public Star(java.lang.String commonId,
            java.lang.String hipparcosId,
            java.lang.String tychoId,
            RA ra,
            Dec dec,
            Epoch epoch,
            Magnitude magnitude,
            Variability variability,
            double xdd,
            double zdd)

Generally two of the ids passed in will be expected to be null. They may get set after construction. If magnitude or variability are unknown enter null for each. This constructor also takes the transformed coordinates (xdd, zdd) for plotting on a star chart. See class StarChart for details of the transformation.

Star

public Star(java.lang.String commonId,
            java.lang.String hipparcosId,
            java.lang.String tychoId,
            RA ra,
            Dec dec,
            Epoch epoch,
            Magnitude magnitude,
            Variability variability,
            ProperMotion pm)

Generally two of the ids passed in will be expected to be null; they may get set after construction. If magnitude or variability are unknown enter null for each.

Star

public Star(java.lang.String commonId,
            java.lang.String hipparcosId,
            java.lang.String tychoId,
            RA ra,
            Dec dec,
            Epoch epoch,
            Magnitude magnitude,
            Variability variability,
            ProperMotion pm,
            double xdd,
            double zdd)

Generally two of the ids passed in will be expected to be null. They may get set after construction. If magnitude or variability are unknown enter null for each. This constructor also takes the transformed coordinates (xdd, zdd) for plotting on a star chart. See class StarChart for details of the transformation.

Star

public Star()

Set the fields individually after construction, if you really must.

Method Detail

getId

public java.lang.String getId()

If the star has a commonId return that; otherwise if it has a hipparcosId return that; otherwise if it has a tychoId return that; otherwise if it has an otherId return that; otherwise return an empty string.

getCommonId

public java.lang.String getCommonId()

Comprising the constellation abbreviation and Flamsteed number and/or Bayer letter (only brightest stars have these).

setCommonId

public void setCommonId(java.lang.String id)

getHipparcosId

public java.lang.String getHipparcosId()

setHipparcosId

public void setHipparcosId(java.lang.String id)

getTychoId

public java.lang.String getTychoId()

setTychoId

public void setTychoId(java.lang.String id)

getOtherId

public java.lang.String getOtherId()

setOtherId

public void setOtherId(java.lang.String id)

For user-entered reference of their own devising.

getTypeOfStellarObject

public java.lang.String getTypeOfStellarObject()

setTypeOfStellarObject

public void setTypeOfStellarObject(java.lang.String type)

Some data sources will provide some kind of description to be set here.

getPosition

public SkyPoint getPosition()

If the star's position is unknown this returns null.

setPosition

public void setPosition(SkyPoint pt)

getMagnitudes

public java.util.List<Magnitude> getMagnitudes()

Get the list of magnitudes

addMagnitude

public void addMagnitude(Magnitude m)

Add another magnitude for this star. A star can have multiple magnitudes, in different bands.

setMagnitude

public void setMagnitude(Magnitude m)

For entering a manual magnitude value to replace all others (as in BlobMenu). NB: REPLACES ALL.

getMagnitude

public Magnitude getMagnitude()

Get the "principal" magnitude. If the star has only one magnitude value that is returned. Otherwise the list of magnitudes is scanned. If one is found that has band id "V" or "v" that is returned. Otherwise the first one in the list is returned. If the star's magnitude is unknown (the magnitudes list is empty) this returns null, not a special value.

getMagnitude

public Magnitude getMagnitude(java.lang.String bandId)

Get the magnitude with given band id, or null if not found.

getVariability

public Variability getVariability()

If the star's variability is unknown this returns null, not a special value.

setVariability

public void setVariability(Variability v)

getProperMotion

public ProperMotion getProperMotion()

If the star's proper motion is unknown this returns a ProperMotion object in which both components are zero.

setProperMotion

public void setProperMotion(ProperMotion pm)

equals

public boolean equals(java.lang.Object other)

Does not involve the fields xdd and zdd because a given star may be plotted in different positions on different StarCharts.

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Enable objects of this class to be used as hash keys. NB: Does not involve the fields xdd and zdd because a given star may be plotted in different positions on different StarCharts.

Overrides:

hashCode in class java.lang.Object

clone

public Star clone()

Returns a new Star object with the same data.

Overrides:

clone in class java.lang.Object

changeEpoch

public void changeEpoch(Epoch newEquinox,
                        JulianDate newEpoch)

This adjusts the fields of the current object to the given new equinox (eg, J2000) and epoch (eg, JD now) by first applying proper motion for the new epoch and then calling SkyPoint.changeEpoch (equinox) on the resulting position.

measurePosition

public SkyPoint measurePosition(ImFrame parentFrame,
                                BlobMeasList measList)

If this star has unknown position (RA/Dec), do astrometry using the known reference stars in the given MeasList. The star's position field is then set and also returned (null if not successful).
13.12.30: It used to be that all stars in the measList which have unknown position would be measured. That is no longer the case. Now only this star is measured, and then only if it does not already have a known position.

estimatePlateCentre

protected SkyPoint estimatePlateCentre(java.util.List<BlobMeas> refBlobs,
                                       Image image,
                                       Epoch epoch,
                                       MeasuredValue degreesPerPixel)

calibrateImage

protected MeasuredValue calibrateImage(java.util.List<BlobMeas> refBlobs)

Uses known celestial coordinates of refBlobs (from a StarChart: every BlobMeas must have a Star) to return scale factor in degrees per pixel.

toString

public java.lang.String toString()

Simplified summary

Overrides:

toString in class java.lang.Object

toFoldedString

public java.lang.String toFoldedString()

More detailed and more suitable for display to the user - reasonably formatted multi-line text, using "\n" as the line feed character.

toFoldedString

public java.lang.String toFoldedString(java.lang.String lineFeed)

The lineFeed might be "\n" or "
" etc.

toXML

public java.lang.StringBuffer toXML(java.lang.String indent)

The indent string would typically contain some tab characters (\t).

setPlotPoint

public void setPlotPoint(java.awt.Point pt)

Set by StarChart when first plotting the star.

getPlotPoint

public java.awt.Point getPlotPoint()