Omicron Aquilae

{{Starbox begin

| name = ο Aquilae

}}

{{Starbox image

| image=

{{Location mark

| image=Aquila constellation map.svg | alt= | float=center | width=260

| label= | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=ο Aquilae

| x=434 | y=296

}}

| caption=Location of ο Aquilae (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|19|51|01.644}}

| dec = {{DEC|+10|24|56.59}}

| appmag_v = 5.11

| constell = Aquila

}}

{{Starbox character

| class = {{nowrap|F8 V + M3 V}}

| r-i = 0.29{{cn|date=April 2025}}

| v-r =

| b-v = 0.55

| u-b = 1.486

| variable =

}}

{{Starbox astrometry

| radial_v = 0.036{{±|0.0003}}

| prop_mo_ra = +241.713

| prop_mo_dec = −136.695

| pm_footnote =

| parallax = 51.3133

| p_error = 0.0898

| parallax_footnote =

| absmag_v = 3.71

}}

{{Starbox detail

| component1 = ο Aql A

| mass = 1.28{{±|0.06|0.13}}

| radius = 1.48{{±|0.03}}

| luminosity = 2.79{{±|0.13}}

| temperature = 6,123{{±|47|46}}

| gravity = 4.22{{±|0.03}}

| metal_fe = +0.12{{±|0.01}}

| rotational_velocity = 3

| age_gyr = 3.57{{±|2.03|1.07}}

| component2 = ο Aql B

| mass2 = 0.33

| temperature2 = 3,338

| luminosity2 = 0.015

| radius2 = 0.37

| gravity2 = 4.86

}}

{{Starbox catalog

| names = {{odlist | F=54 Aquilae | B=ο Aquilae | BD=+10 4073 | ADS=13012 | GC=27480 | GJ=768.1 | GJ2=9671 | HD=187691 | HIP=97675 | HR=7560 | NLTT=48319 | LTT=15798 | PPM=137097 | SAO=1053380 | WDS=J19510+1025A }}

}}

{{starbox reference

| Simbad=omi+Aql

}}

Omicron Aquilae is a double star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from ο Aquilae, and abbreviated Omicron Aql or ο Aql. The brighter component has an apparent visual magnitude of +5.11, which means it is faintly visible to the naked eye in dark suburban skies. The annual parallax shift of this star is {{val|51.3|ul=mas}}, which is equivalent to a physical distance of {{Convert|63.6|ly|pc|abbr=off|lk=on}} from Earth.

The primary component, Omicron Aquilae A, is an F-type main sequence star with a stellar classification of F8 V. It has about 128% of the mass of the Sun and 148% of the Sun's radius. With an age of roughly 3.6 billion years, it appears to spinning at a leisurely rate with a projected rotational velocity of 3 km/s. The outer atmosphere has an effective temperature of 6,123 K, giving it the yellowish-white hue of an F-type star.

In 1998, Omicron Aquilae was one of nine stars identified as experiencing a superflare. The first flare observed from Omicron Aquilae was in 1979, with a magnitude increase of 0.07 and a duration of less than five days. The second occurred in 1980, with a magnitude change of 0.09 and a duration of fifteen days. The energy released during the second flare is estimated as {{val|9|e=37|u=erg}}.

There is a magnitude 12.67 common proper motion companion located at an angular separation of 22.5 arcseconds along a position angle of 221°. Based upon its matching parallax value, this corresponds to a projected separation of 431 astronomical units. (Hence, the companion is located at this separation or greater.) This is confusingly designated WDS J19510+1025C or ο Aquilae B. It is a small red dwarf star with a stellar classification of M3 V. A third star, a magnitude fainter and slightly closer to the primary, is an optical companion that appears near the primary only through a chance alignment.

References

{{reflist|refs=

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| journal=The Astrophysical Journal Supplement Series

| volume=272 | issue=2 | at=id. 30 | date=June 2024

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}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%207560 HR 7560]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J19510%2b1025A CCDM 19510+1025]
[http://aladin.u-strasbg.fr/AladinPreview?-c=NLTT+48319&ident=NLTT+48319&submit=Aladin+previewer Image Omicron Aquilae]

Category:F-type main-sequence stars

Category:M-type main-sequence stars

Category:Double stars

Category:Aquila (constellation)