This abstract class is the parent of all HDU types. It provides basic functionality for an HDU. This class is abstract (MustInherit in Visual Basic)abstractMustInherit and so cannot be instantiated.

The following tables list the members exposed by BasicHDU.

Protected Constructors

	Name	Description
	BasicHDU	Initializes a new instance of the BasicHDU class.

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Public Fields

	Name	Description
	BITPIX_BYTE	Constant for BitPix byte value This field is constant and read-only.
	BITPIX_DOUBLE	Constant for BitPix double value This field is constant and read-only.
	BITPIX_FLOAT	Constant for BitPix float value This field is constant and read-only.
	BITPIX_INT	Constant for BitPix integer value This field is constant and read-only.
	BITPIX_LONG	Constant for BitPix long value This field is constant and read-only.
	BITPIX_SHORT	Constant for BitPix short value This field is constant and read-only.

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Protected Fields

	Name	Description
	isPrimary	Is this the first HDU in a FITS file?
	myData	The associated data unit.
	myHeader	The associated header.

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Public Properties

	Name	Description
	Author	Return the name of the person who compiled the information in the data associated with this header.
	Axes
	BitPix
	BlankValue
	BScale	Returns the value oF BSCALE from HDU The value field shall contain a floating point number.The default value for this keyword os 1.0
	BUnit	The value shall contain a character String, describing the physical units in which the quantities in the array, after application of BSCALE and BZERO,are expressed.
	BZero	Returns the value oF BZero from HDU This keyword shall be used, along with the BSCALE keyword The default value for this keyword is 0.0.
	CreationDate	Get the FITS file creation date as a `Date` object.
	Data	Get the associated Data object
	DummyHDU	Returns DummyHDu instance
	Epoch	Get the equinox in years for the celestial coordinate system in which positions given in either the header or data are expressed.
	Equinox	Get the equinox in years for the celestial coordinate system in which positions given in either the header or data are expressed.
	FileOffset	Get the starting offset of the HDU
	GroupCount	Returns the value oF GCOUNT from HDU
	Header	Get the associated header
	Instrument	Get the name of the instrument which was used to acquire the data in this FITS file.
	Kernel	Get the non-FITS data object
	MaximumValue	Return the minimum valid value in the array.
	MinimumValue	Return the minimum valid value in the array.
	Object	Get the name of the observed object in this FITS file.
	ObservationDate	Get the FITS file observation date as a `Date` object.
	Observer	Get the name of the person who acquired the data in this FITS file.
	Origin	Get the name of the organization which created this FITS file.
	ParameterCount	Returns the value oF PCOUNT from HDU
	Reference	Return the citation of a reference where the data associated with this header are published.
	Rewriteable	Is the HDU rewriteable
	Size	Get the total size in bytes of the HDU.
	Telescope	Get the name of the telescope which was used to acquire the data in this FITS file.

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Public Methods

	Name	Description
	AddValue	Overloaded. Add boolean information to the header
	Equals	Determines whether the specified Object is equal to the current Object. (inherited from Object)
	GetHashCode	Serves as a hash function for a particular type. GetHashCode is suitable for use in hashing algorithms and data structures like a hash table. (inherited from Object)
	GetTrimmedString	Get the String value associated with `keyword`
	GetType	Gets the Type of the current instance. (inherited from Object)
	Info	Print out some information about this HDU.
	IsHeader	Check that this is a valid header for the HDU.
	Read	Read out the HDU from the data stream. This will overwrite any existing header and data components.
	ReadData	Read in the Data object for this HDU.
	Rewrite	Rewrite the HDU.
	SkipData	Skip the Data object immediately after the given Header object on the given stream object.
	SkipData	Skip the Data object for this HDU.
	ToString	Returns a String that represents the current Object. (inherited from Object)
	Write	Write out the HDU.

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Protected Methods

	Name	Description
	Finalize	Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (inherited from Object)
	MemberwiseClone	Creates a shallow copy of the current Object. (inherited from Object)