Delta Apodis

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Template:Short description

δ Apodis
Template:Location mark
Location of δ Apodis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Apus[1]
δ1 Aps
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) Template:Val[3]
δ2 Aps
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) +5.27[5]
Characteristics
δ1 Aps
Spectral type M5 IIIb[6]
U−B Template:Engvar +1.680±0.110[1]
B−V Template:Engvar +1.69[5]
Variable type LB?[3]
δ2 Aps
Spectral type K3 III[6]
U−B Template:Engvar +1.62[5]
B−V Template:Engvar +1.413±0.012[1]
Astrometry
δ1 Aps
Radial velocity (Rv)−12.0[7] km/s
Proper motion (μ) RA: −9.678 mas/yr[2]
Dec.: −37.147 mas/yr[2]
Parallax (π)5.2508±0.1942 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−2.16[1]
δ2 Aps
Radial velocity (Rv)−10.2[8] km/s
Proper motion (μ) RA: −1.817 mas/yr[2]
Dec.: −31.511 mas/yr[2]
Parallax (π)5.795±0.0902 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−1.10[1]
Other designations
Template:Odlist[9][10]
δ1 Aps: Template:Odlist[9]
δ2 Aps: Template:Odlist[10]
Database references
SIMBADδ1 Aps
δ2 Aps

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Delta Apodis is a double star in the southern constellation of Apus. Its identifier is a Bayer designation that is Latinized from δ Apodis, and abbreviated Del Aps or δ Aps, respectively. Based on parallax measurements, the distance to δ1 Apodis is approximately 620 light years,[2] while δ2 Apodis is found to be around 563 light years from Earth.[4] They may form a common proper motion pair.Script error: No such module "Unsubst".

File:Delta1ApsLightCurve.png
A light curve for Delta1 Apodis, plotted from Hipparcos data[11]

The brighter star, δ1 Apodis, has an apparent magnitude that varies from +4.66 to +4.87.[12] It is a red giant with a stellar classification of M5 IIIb,[6] and is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days.[13] δ2 Apodis has an apparent magnitude of +5.27 and is an orange K-type giant with a class of K3 III.[6] Both stars are bright enough to be seen with the naked eye under good observing conditions. The pair have an angular separation of 103.4 arcseconds (as of 2016),[14] which is wide enough to allow them to be seen individually by a person with good eyesight.

Naming

In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Exotic Bird, refers to an asterism consisting of δ1 Apodis, ζ Apodis, ι Apodis, β Apodis, γ Apodis, δ Octantis, η Apodis, α Apodis and ε Apodis. Consequently, δ1 Apodis itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[15]

References

Template:Reflist

External links

Template:Stars of Apus

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Anderson_Francis_2012
  2. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3a
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named gcvs
  4. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3b3
  5. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  6. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named houk1979
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named scfs
  8. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named gcsrv
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD1
  10. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD2
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named CDS
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named AAVSOdel1
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named mnras400_4_1945
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Mason_et_al_2014
  15. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日 Template:Webarchive
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