70 Aquarii

{{Starbox image

| image = 250px

| caption = The visual band light curve of 70 Aquarii, adapted from Weiss (1977)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|22|48|30.21043}}

| dec={{DEC|–10|33|19.7143}}

| appmag_v=6.19

| constell=Aquarius

}}

{{Starbox character

| type=main sequencec

| class=F0 V

| b-v=+0.28

| u-b=

| variable=δ Sct

}}

{{Starbox astrometry

| radial_v=–5.8

| prop_mo_ra=+31.535

| prop_mo_dec=+7.915

| parallax=7.6654

| p_error=0.0704

| parallax_footnote=

| absmag_v=+0.88

}}

{{Starbox detail

| mass=

| radius={{Val|4.17|0.17|0.23}}

| luminosity={{Val|44.8|0.5}}

| temperature={{Val|7314|187|144|fmt=commas}}

| metal_fe={{Val|0.02|0.15}}

| gravity=3.48

| rotational_velocity=110

| age_myr=

}}

{{Starbox catalog

| names={{odlist | F=70 Aqr | BD=−11°5923 | FK5=3825 | HD=215874 | HIP=112615 | HR=8676 | SAO=165308 }}

}}

{{Starbox reference

| Simbad=70+Aqr

}}

70 Aquarii is a variable star located 425 light years away from the Sun in the equatorial constellation of Aquarius. It has the variable star designation FM Aquarii; 70 Aquarii is the Flamsteed designation. It is near the lower limit of visibility to the naked eye, appearing as a dim, yellow-white hued star with a baseline apparent visual magnitude of 6.19. This star is moving closer to the Earth with a heliocentric radial velocity of –5.8 km/s.

Werner Wolfgang Weiss discovered that 70 Aquarii was a variable star in 1977. It was given its variable star designation in 1981.

This is an F-type main-sequence star with a stellar classification of F0 V. Located in the lower part of the instability strip, it is a Delta Scuti-type variable that ranges in brightness from magnitude 6.16 down to 6.19 with a period of {{Convert|0.087|days|minutes|abbr=off|order=flip}}. The star has a high rate of spin, showing a projected rotational velocity of 110 km/s. It has four times the Sun's radius and is radiating 45 times the luminosity of the Sun from its photosphere at an effective temperature of around 7,314 K.

References

{{reflist|refs=

{{cite journal |last1=Kholopov |first1=P. N. |last2=Samus |first2=N. N. |last3=Kukarkina |first3=N. P. |last4=Medvedeva |first4=G. I. |last5=Perova |first5=N. B. |title=65th Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |date=February 1981 |volume=1921 |pages=1–21 |bibcode=1981IBVS.1921....1K |url=https://articles.adsabs.harvard.edu/pdf/1981IBVS.1921....1K |access-date=18 November 2024}}

{{cite journal |last1=Weiss |first1=W. W. |title=HR 239 and HR 8676: Two delta Scuti-Type Variables |journal=Information Bulletin on Variable Stars |date=November 1977 |volume=1364 |page=1 |bibcode=1977IBVS.1364....1W |url=http://articles.adsabs.harvard.edu//full/1977IBVS.1364....1W/0000001.000.html |access-date=16 October 2021}}

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

{{citation | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 |date=October 2002 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | postscript=. |arxiv = astro-ph/0205255 | s2cid=14070763 }}

{{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 | year=1968 | bibcode=1968MNSSA..27...11C | postscript=. }}

{{citation | display-authors=1 | last1=Paunzen | first1=E. | last2=Handler | first2=G. | last3=Weiss | first3=W. W. | last4=Nesvacil | first4=N. | last5=Hempel | first5=A. | last6=Romero-Colmenero | first6=E. | last7=Vuthela | first7=F. F. | last8=Reegen | first8=P. | last9=Shobbrook | first9=R. R. | last10=Kilkenny | first10=D. | title=On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars | journal=Astronomy and Astrophysics | volume=392 | pages=515–528 |date=September 2002 | issue=2 | doi=10.1051/0004-6361:20020854 | bibcode=2002A&A...392..515P |arxiv = astro-ph/0207494 | s2cid=54666586 }}

{{citation

| title=Michigan catalogue of two-dimensional spectral types for the HD Stars

| last1=Houk | first1=N. | last2=Swift | first2=C.

| journal=Michigan Spectral Survey | postscript=.

| volume=5 | year=1999 | bibcode=1999MSS...C05....0H }}

{{citation

| display-authors=1 | last1=Samus | first1=N. N.

| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.

| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

| year=2017 | volume=61 | issue=1 | pages=80–88