Delta Apodis

{{Starbox begin

| name=δ Apodis

}}

{{Starbox image

| image=

{{Location mark

| image=Apus constellation map.svg

| alt= | float=center | width=240

| label= | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=δ Apodis

| x%=46.0 | y%=64.0

}}

| caption=Location of δ Apodis (circled)

}}

{{Starbox observe 2s

| epoch = J2000

| constell = Apus

| component1 = δ¹ Aps

| ra1 = {{RA|16|20|20.802}}

| dec1 = {{DEC|-78|41|44.69}}

| appmag_v1 = {{val|4.66|to|4.87}}

| component2 = δ² Aps

| ra2 = {{RA|16|20|26.858}}

| dec2 = {{DEC|-78|40|02.99}}

| appmag_v2 = +5.27

}}

{{Starbox character

| component1 = δ¹ Aps

| class = M5 IIIb

| b-v = +1.69

| u-b = +1.680{{±|0.110}}

| variable = LB?

| component2 = δ² Aps

| class2 = K3 III

| b-v2 = +1.413{{±|0.012}}

| u-b2 = +1.62

}}

{{Starbox astrometry

| component1 = δ¹ Aps

| radial_v = −12.0

| prop_mo_ra = −9.678

| prop_mo_dec = −37.147

| pm_footnote =

| parallax = 5.2508

| p_error = 0.1942

| parallax_footnote =

| absmag_v = −2.16

| component2 = δ² Aps

| radial_v2 = −10.2

| prop_mo_ra2 = −1.817

| prop_mo_dec2= −31.511

| pm_footnote2 =

| parallax2 = 5.795

| p_error2 = 0.0902

| parallax_footnote2 =

| absmag_v2 = −1.10

}}

{{Starbox catalog

| names = {{odlist | CP=−78 1092 | FK5=1424 | HR=6020 }}

| component1 = δ¹ Aps

| names1 = {{odlist | HD=145366 | HIP=80047 | SAO=257380 }}

| component2 = δ² Aps

| names2 = {{odlist | HD=145388 | HIP=80057 | SAO=257381 }}

}}

{{Starbox reference

| Simbad = del01+Aps | sn=δ¹ Aps

| Simbad2 = del02+Aps | sn2=δ² Aps

}}

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 δ{{sup|1}} Apodis is approximately 620 light years, while δ{{sup|2}} Apodis is found to be around 563 light years from Earth. They may form a common proper motion pair.{{cn|date=March 2025}}

File:Delta1ApsLightCurve.png for Delta¹ Apodis, plotted from Hipparcos data]]

The brighter star, δ{{sup|1}} Apodis, has an apparent magnitude that varies from +4.66 to +4.87. It is a red giant with a stellar classification of M5 IIIb, and is classified as a semiregular variable with pulsations of multiple periods of 68.0, 94.9 and 101.7 days. δ{{sup|2}} Apodis has an apparent magnitude of +5.27 and is an orange K-type giant with a class of K3 III. 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), 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, {{lang|zh|異雀}} ({{lang|zh-Latn|Yì Què}}), 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 {{lang|zh|異雀六}} ({{lang|zh-Latn|Yì Què liù}}, {{langx|en|the Sixth Star of Exotic Bird}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060729.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 29 日] {{Webarchive|url=https://web.archive.org/web/20110522124325/http://aeea.nmns.edu.tw/2006/0607/ap060729.html |date=2011-05-22 }}

References

{{reflist|refs=

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite web

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats

| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats

| publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}

{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=1 | last1=Houk | first1=Nancy | location=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | year=1979 | bibcode=1978mcts.book.....H | postscript=. }}

{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | journal=Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | volume=35 | page=1 | bibcode=1999VeARI..35....1W | postscript=. }}

{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

{{citation | display-authors=1 | last1=Tabur | first1=V. | last2=Bedding | first2=T. R. | last3=Kiss | first3=L. L. | last4=Moon | first4=T. T. | last5=Szeidl | first5=B. | last6=Kjeldsen | first6=H. | title=Long-term photometry and periods for 261 nearby pulsating M giants | journal=Monthly Notices of the Royal Astronomical Society | volume=400 | issue=4 | pages=1945–1961 |date=December 2009 | doi=10.1111/j.1365-2966.2009.15588.x | doi-access=free | bibcode=2009MNRAS.400.1945T | postscript=. |arxiv = 0908.3228 | s2cid=15358380 }}

{{citation | title=del01 Aps -- Pulsating variable Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+145366 | accessdate=2012-07-08 | postscript=. }}

{{citation | title=HR 6021 -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=del02+Aps | accessdate=2012-07-08 | postscript=. }}

{{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W | postscript=. }}

{{citation | postscript=.

| title=Delta1 Apodis

| last=Watson | first=Christopher |date=August 25, 2009

| work=The International Variable Star Index

| publisher=American Association of Variable Star Observers

| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=842

| accessdate=30 March 2016}}

{{citation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012