103 Aquarii

{{about|A¹ Aquarii|A² Aquarii|104 Aquarii|all stars with the same Bayer designation|A Aquarii}}

{{Starbox observe

| epoch=J2000.0 (ICRS)

| ra={{RA|23|41|34.48893}}

| dec={{DEC|−18|01|37.4656}}

| appmag_v=5.34

| constell=Aquarius

}}

{{Starbox character

| class=K4/K5 III

| b-v=+1.57

| u-b=

| variable=

}}

{{Starbox astrometry

| radial_v = +25.1

| prop_mo_ra = –41.665

| prop_mo_dec = –71.428

| parallax = 4.6918

| p_error = 0.2010

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass =

| radius = {{Val|63.58|0.54|0.99}}

| luminosity = {{Val|848.285|41.525}}

| temperature = 3,910

| metal_fe = –0.18

| gravity = 1.59

| rotational_velocity =

| age_myr =

}}

{{Starbox catalog

| names={{odlist | F=103 Aqr | BD=−18°6357 | HD=222547 | HIP=116889 | HR=8980 | SAO=165834 }}

}}

{{Starbox reference

| Simbad=103+Aqr

}}

103 Aquarii is a single star in the equatorial constellation of Aquarius. 103 Aquarii is the Flamsteed designation, although it also bears the Bayer designation A¹ Aquarii. It is faint but visible to the naked eye as an orange hued star with an apparent visual magnitude of 5.34. Based upon an annual parallax shift of {{Val|4.69|ul=mas}}, the distance to this star is around {{Convert|700|ly|pc|abbr=off|lk=on}}. It is moving away from the Earth with a heliocentric radial velocity of +25 km/s.

This is classified as a K-type giant star, having evolved off the main sequence after exhausting the hydrogen at its core and expanded to 64 times the Sun's radius. The star is radiating 848 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,910 K.

References

{{reflist|refs=

{{citation | last=Wilson | first=R. E. | date=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Washington | pages=0 | publisher=Carnegie Institute of Washington, D.C. | bibcode=1953GCRV..C......0W | postscript=. }}

{{citation | last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M. | title=Michigan catalogue of two-dimensional spectral types for the HD stars | journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | date=1978 | bibcode=1988mcts.book.....H | postscript=. }}

{{citation | last1=Corben | first1=P. M. | last2=Stoy | first2=R. H. | title=Photoelectric Magnitudes and Colours for Bright Southern Stars | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=27 | page=11 | date=1968 | bibcode=1968MNSSA..27...11C | postscript=. }}

{{cite journal |last=McWilliam |first=Andrew |title=High-resolution spectroscopic survey of 671 GK giants |journal=Astrophysical Journal Supplement Series |date=December 1990|volume=74 |pages=1075–1128 |bibcode=1990ApJS...74.1075M |doi=10.1086/191527 |doi-access=free }}

{{citation

| url=http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=IV/27A/catalog&recno=3991

| title=HD 222547 | access-date=2019-05-20

| work=database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index

| first1=N. D. | last1=Kostjuk | postscript=.

| publisher=Institute of Astronomy of Russian Academy of Sciences

| year=2002 }}; CDS ID IV/27A.

{{citation

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| title=A catalogue of multiplicity among bright stellar systems

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869–879 | date=September 2008

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=23+41+34.4888-18+01+37.477&ident=*+103+Aqr&submit=Aladin+previewer Aladin previewer, image]
[http://aladin.u-strasbg.fr/java/nph-aladin.pl?script=get+Aladin+*+103+Aqr+11arcmin%3Bget+simbad+*+103+Aqr+11arcmin&from=Simbad4&submit=Aladin+applet Aladin sky atlas, image]

Category:K-type giants

Category:Aquarius (constellation)