HD 7977

{{Starbox observe

| epoch = J2000.0

| constell = Cassiopeia

| ra = {{RA|01|20|31.596}}

| dec = {{DEC|+61|52|57.01}}

| appmag_v = 9.04

}}

{{Starbox character

| type = main sequence

| class = G3

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = +0.144

| prop_mo_dec = +0.010

| parallax = 13.2118

| p_error = 0.0322

| parallax_footnote =

| dist_pc =

| absmag_v =

}}

{{Starbox detail

| mass = 1.07

| radius = 1.09

| luminosity = 1.20

| temperature = 5,816

| metal_fe = −0.59

| gravity = 4.35

| rotational_velocity =

| age_gyr = 6.7

}}

{{Starbox catalog

| names = HD 7977, BD+61°250, SAO 11703

}}

{{Starbox reference

| Simbad = HD+7977

}}

HD 7977 (also designated as TYC 4034-1077-1 or USNO-A2 1500-01356484) is a G-type main-sequence star located in the constellation of Cassiopeia, around 246.9 light-years away from Earth. HD 7977 is notable for its close flyby of the Solar System 2.8 million years ago. Its flyby may have taken it close enough to the Sun that it penetrated deep into the Oort Cloud and disturbed the population of Oort Cloud bodies and long-period comets there. Its mass is equivalent to 1.07 times the Sun's mass.

File:Objects between sun and alpha centauri.jpg), which includes HD 7977]]

References

{{Reflist|refs=

{{cite journal

| title=The Tycho-2 catalogue of the 2.5 million brightest stars

| journal=Astronomy and Astrophysics

| last1=Høg | first1=E.

| last2=Fabricius | first2=C.

| last3=Makarov | first3=V. V.

| last4=Urban | first4=S.

| last5=Corbin | first5=T.

| last6=Wycoff | first6=G.

| last7=Bastian | first7=U.

| last8=Schwekendiek | first8=P.

| last9=Wicenec | first9=A.

| display-authors=5

| volume=355 | pages=L27–L30 | date=March 2000

| bibcode=2000A&A...355L..27H

| doi=10.1888/0333750888/2862

}}

{{Cite web |last=Guide |first=Universe |title=HD 7977 Star Distance, Colour, Size (Radius) and other Facts |url=https://www.universeguide.com/star/124093/hd7977 |access-date=2023-11-08 |website=www.universeguide.com |language=en}}

{{cite journal |bibcode=2022AstL...48..542B |title=Search for Close Stellar Encounters with the Solar System Based on Data from the Gaia DR3 Catalogue |last1=Bobylev |first1=V. V. |last2=Bajkova |first2=A. T. |journal=Astronomy Letters |date=2022 |volume=48 |issue=9 |page=542 |doi=10.1134/S1063773722080011 |arxiv=2206.14443 |s2cid=256832377 }}

{{cite journal |bibcode=2022RNAAS...6..152D |title=The Closest Past Flyby of a Known Star to the Solar System: HD 7977, UCAC4 237-008148 or WISE J072003.20-084651.2? |last1=de la Fuente Marcos |first1=Raúl |last2=de la Fuente Marcos |first2=Carlos |journal=Research Notes of the American Astronomical Society |date=2022 |volume=6 |issue=7 |page=152 |doi=10.3847/2515-5172/ac842b |doi-access=free }}

{{cite journal |bibcode=1935bsdn.book.....S |title=Bergedorfer Spektral-Durchmusterung der 115 noerdlichen Kapteynschen Eichfelder - Bd.1: Eichfeld 1 bis 19, Deklination +90 deg., +75 deg., +60 deg |last1=Schwassmann |first1=Arnold |last2=Van Rhijn |first2=P. J. |journal=Bergedorf: Hamburger Sternwarte |date=1935 }}

}}

Category:Cassiopeia (constellation)

7977