Delta Apodis

δ Apodis
Location of δ Apodis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
δ1 Aps
Right ascension 16h 20m 20.80462s[1]
Declination −78° 41′ 44.6889″[1]
Apparent magnitude (V) +4.66 - 4.87[2]
δ2 Aps
Right ascension 16h 20m 26.85843s[1]
Declination −78° 40′ 02.9901″[1]
Apparent magnitude (V) +5.27[3]
Characteristics
Spectral type M5 IIIb + K3 III[4]
U−B color index +1.68/+1.62[3]
B−V color index +1.69/+1.41[3]
Variable type LB?[2]
Astrometry
δ1 Aps
Radial velocity (Rv)−12.0[5] km/s
Proper motion (μ) RA: −9.122±0.390[6] mas/yr
Dec.: −36.968±0.505[6] mas/yr
Parallax (π)5.1748 ± 0.2734 mas[6]
Distance630 ± 30 ly
(190 ± 10 pc)
δ2 Aps
Radial velocity (Rv)−10.2[7] km/s
Proper motion (μ) RA: −1.321±0.229[6] mas/yr
Dec.: −31.507±0.259[6] mas/yr
Parallax (π)5.9845 ± 0.1353 mas[6]
Distance550 ± 10 ly
(167 ± 4 pc)
Other designations
CP-78 1092, FK5 1424, HR 6020.[8][9]
δ1 Aps: HD 145366, HIP 80047, SAO 257380.[8]
δ2 Aps: HD 145388, HIP 80057, SAO 257381.[9]
Database references
SIMBADδ1 Aps
δ2 Aps

Delta Apodis (δ Aps, δ Apodis) is the Bayer designation for a double star in the southern constellation of Apus.

A light curve for Delta1 Apodis, plotted from Hipparcos data[10]

The brighter star, δ1 Apodis, is an M-type red giant and has an apparent magnitude that varies from magnitude +4.66 to +4.87.[11] It is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days.[12] At an angular separation of 102.9 arcseconds is δ2 Apodis, an orange K-type giant with an apparent magnitude of +5.27.

Hipparcos data report the distance to δ1 Apodis to be approximately 760 light years, while δ2 Apodis is found to be around 610 light years from Earth. They may form a common proper motion pair.

  1. ^ a b c d Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference scfs was invoked but never defined (see the help page).
  6. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  7. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference SIMBAD1 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference SIMBAD2 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  11. ^ Watson, Christopher (25 August 2009). "Delta1 Apodis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 30 March 2016.
  12. ^ Cite error: The named reference mnras400_4_1945 was invoked but never defined (see the help page).