Universe Guide

Delta Pavonis

Delta Pavonis Facts

  • Delta Pavonis is a subgiant star that can be located in the constellation of Pavo. The description is based on the spectral class.
  • Delta Pavonis is a main star of the constellation outline.
  • Based on the spectral type (G5IV-Vvar) of the star, the star's colour is yellow .
  • The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.
  • The star has an estimated age of 9.30 Billion of Years but could be as young as 5.80 to 10.70 according to Hipparcos.
  • Using the most recent figures given by the 2007 Hipparcos data, the star is 19.92 light years away from us. Distance

Delta Pavonis's Alternative Names

Delta Pavonis (Del Pav) is the Bayer Classification for the star. The Bayer Classification was created by Johann Bayer in 1603. The brightest star in the constellation is normally given the Alpha designation, there are exceptions such as Pollux which is Beta Geminorum.

The Id of the star in the Yale Bright Star Catalogue is HR7665. HIP99240 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD190248. The Gliese ID of the star is GL 780. The star was part of the original catalogue devised by German Astronomer Wilheim Gliese of stars located within 20 parsecs of Earth. Star Names

More details on objects' alternative names can be found at Star Names .

Location of Delta Pavonis

The location of the subgiant star in the night sky is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the object is compared to the celestial equator and is expressed in degrees. For Delta Pavonis, the location is 20h 08m 41.86 and -66° 10` 45.6 .

Radial Velocity and Proper Motion of Delta Pavonis

Proper Motion

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -1,130.05 ± 0.11 milliarcseconds/year towards the north and 1,211.03 ± 0.17 milliarcseconds/year east if we saw them in the horizon.

Radial Velocity

The Radial Velocity, that is the speed at which the star is moving away/towards the Sun is -19.30000 km/s with an error of about 1.43 km/s . When the value is negative then the star and the Sun are getting closer to one another, likewise, a positive number means that two stars are moving away. Its nothing to fear as the stars are so far apart, they won't collide in our life-time, if ever.

Physical Properties of Delta Pavonis

Delta Pavonis Colour and Temperature

Based on the star's spectral type of G5IV-Vvar , Delta Pavonis's colour and type is yellow subgiant star. The star's effective temperature is 5,590 Kelvin which is cooler than our own Sun's effective Temperature which is 5,777 Kelvin

Delta Pavonis Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 1.41 that I have given is based on the value in the Simbad Hipparcos Extended Catalogue at the University of Strasbourg from 2012.

Delta Pavonis Radius

Delta Pavonis estimated radius has been calculated as being 1.26 times bigger than the Sun. The Sun's radius is 695,800km, therefore the star's radius is an estimated 878,343.66.km. If you need the diameter of the star, you just need to multiple the radius by 2. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 1.262350764548905867488138078. The figure is derived at by using the formula from SDSS rather than peer reviewed papers. It has been known to produce widely incorrect figures.

Delta Pavonis Iron Abundance

Delta Pavonis Iron Abundance is 0.32 with an error value of 9.99 Fe/H with the Sun has a value of 1 to put it into context. The value comes from the Hipparcos Extended Catalog.

Delta Pavonis Estimated Age

The stars age according to Hipparcos data files put the star at an age of about 9.30 Billion years old but could be between 5.80 and 10.70 Billion years old. In comparison, the Sun's age is about 4.6 Billion Years Old.

Delta Pavonis Apparent and Absolute Magnitudes

Delta Pavonis has an apparent magnitude of 3.55 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of 4.62 If you used the 2007 Parallax value, you would get an absolute magnitude of 4.62. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Delta Pavonis

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 163.73000 which gave the calculated distance to Delta Pavonis as 19.92 light years away from Earth or 6.11 parsecs. If you want that in miles, it is about 117,102,217,433,817.51, based on 1 Ly = 5,878,625,373,183.61 miles.

In 2007, Hipparcos data was revised with a new parallax of 163.71000 which put Delta Pavonis at a distance of 19.92 light years or 6.11 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

Using the 2007 distance, the star is roughly 1,260,269.18 Astronomical Units from the Earth/Sun give or take a few. An Astronomical Unit is the distance between Earth and the Sun. The number of A.U. is the number of times that the star is from the Earth compared to the Sun. The star's Galacto-Centric Distance is 7,396.00 Parsecs or 24,123.04 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Travel Time to Delta Pavonis

The time it will take to travel to this star is dependent on how fast you are going. U.G. has done some calculations as to how long it will take going at differing speeds. A note about the calculations, when I'm talking about years, I'm talking non-leap years only (365 days).

The New Horizons space probe is the fastest probe that we've sent into space at the time of writing. Its primary mission was to visit Pluto which at the time of launch (2006), Pluto was still a planet.

DescriptionSpeed (m.p.h.)Time (years)
Airbus A38073618,150,384.85
Speed of Sound (Mach 1)767.26917,410,690.71
Concorde (Mach 2)1,534.548,705,334.01
New Horizons Probe33,000404,808.58
Speed of Light670,616,629.0019.92

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

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Additional Delta Pavonis Facts and Figures

Visual Facts

Primary / Proper / Traditional NameDelta Pavonis
Alternative NamesDel Pav, HD 190248, HIP 99240, HR 7665, Gliese 780
Spectral TypeG5IV-Vvar
Constellation's Main StarYes
Multiple Star SystemNo / Unknown
Star TypeSubgiant Star
GalaxyMilky Way
Age9.30 Billion Years Old
Age Range5.80 - 10.70 Billion Years Old
Absolute Magnitude 4.62 / 4.62
Visual / Apparent Magnitude3.55
Naked Eye VisibleYes - Magnitudes
Right Ascension (R.A.)20h 08m 41.86
Declination (Dec.)-66° 10` 45.6
Galactic Latitude-32.41381108 degrees
Galactic Longitude329.77093463 degrees
1997 Distance from Earth163.73000 Parallax (milliarcseconds)
 19.92 Light Years
 6.11 Parsecs
2007 Distance from Earth163.71000 Parallax (milliarcseconds)
 19.92 Light Years
 6.11 Parsecs
 1,260,269.18 Astronomical Units
Galacto-Centric Distance24,123.04 Light Years / 7,396.00 Parsecs
Proper Motion Dec.-1130.05000 ± 0.11000 milliarcseconds/year
Proper Motion RA.1211.03000 ± 0.17000 milliarcseconds/year
B-V Index0.75
Radial Velocity-19.30000 ± 1.43 km/s
Iron Abundance0.3200 ± 9.99 Fe/H
Semi-Major Axis7507.0000000
Stellar Luminosity (Lsun)1.4100000

Companions (Multi-Star and Exoplanets) Facts

Exoplanet CountNone/Unaware

Estimated Calculated Facts

Radius (x the Sun)1.26
Effective Temperature5,418 Kelvin

Sources and Links

SIMBAD SourceLink

Pavo Main Stars

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