2 Camelopardalis

{{Short description|Triple star system in the constellation Camelopardalis}}

{{Starbox begin}}

{{Starbox observe

| constell=Camelopardalis

| epoch=J2000

| ra={{RA|04|39|58.06187}}{{cite DR2|272978775488802816}}

| dec={{DEC|+53|28|22.4654}}

| appmag_v=5.36{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}}

}}

{{Starbox character

| component=A

| class=A8V{{cite journal|title=MK Spectral Types for 185 Bright Stars|author=Appenzeller, Immo|journal=Publications of the Astronomical Society of the Pacific|volume=79|number=467|page=102|date=1967|bibcode=1967PASP...79..102A|doi=10.1086/128449|doi-access=free}}

| b-v=+0.34

| u-b=+0.05

}}

{{Starbox astrometry

| radial_v={{Val|+20.1|3.2}}{{cite journal|bibcode=2007A&A...475..519H|doi=10.1051/0004-6361:20077221|arxiv=0707.1891|title=The Geneva-Copenhagen survey of the Solar neighbourhood II|journal=Astronomy and Astrophysics|volume=475|issue=2|pages=519|year=2007|last1=Holmberg|first1=J.|last2=Nordström|first2=B.|last3=Andersen|first3=J.|s2cid=119054949}}

| prop_mo_ra=+44.269

| prop_mo_dec=−77.004

| parallax=15.3220

| p_error=0.3790

| parallax_footnote=

| absmag_v=

}}

{{Starbox orbit

|reference={{cite journal|doi=10.3847/1538-3881/abda42|title=Inner and Outer Orbits in 13 Resolved Hierarchical Stellar Systems|year=2021|last1=Tokovinin|first1=A.|journal=The Astronomical Journal|volume=161|issue=3|page=144|arxiv=2101.02976|bibcode=2021AJ....161..144T|s2cid=231419112 |doi-access=free }}

|primary=2 Cam A

|name=2 Cam B

|period=26.34 ± 0.05

|periastron=B 1988.98 ± 0.03

|eccentricity=0.846 ± 0.005

|axis=0.1727 ± 0.0023

|node=12.6 ± 2.5

|periarg=42.9 ± 2.6

|inclination=113.3 ± 3.4

}}

{{Starbox orbit

|reference=

|primary=2 Cam AB

|name=2 Cam C

|period=660

|periastron=B 2011.7 ± 2.7

|eccentricity=0.405 ± 0.015

|axis=1.666 ± 0.019

|node=286.2 ± 1.8

|periarg=105.1 ± 5.4

|inclination=132.5 ± 1.9

}}

{{Starbox detail

| source=

| component1=A

| mass=1.94

| component2=B

| mass2=1.45

}}

{{Starbox detail|no_heading=y

| component1=C

| mass=1.5

}}

{{Starbox catalog

| names = {{odlist | B=2 Cam | CCDM=J04400+5328ABC | ADS=3358 ABC |BD=+53° 794 | HD=29316 | HIP=21730 | HR=1466 | SAO=24744 | WDS=04400+5328 }}

}}

{{Starbox reference

| Simbad=2+Cam|sn=2 Cam

| Simbad2=ADS+3358+AB|sn2=2 Cam AB

| Simbad3=**+STF+566C|sn3=2 Cam C

}}

{{Starbox end}}

2 Camelopardalis is a triple star system in the northern circumpolar constellation of Camelopardalis, next to the southern constellation border with Perseus. It is dimly visible to the naked eye with a combined apparent visual magnitude of 5.36. The system is located at a distance of about {{Convert|213|ly|pc|abbr=off|lk=on}} from the Sun, based on its parallax. It is drifting further away with a radial velocity of +20 km/s.

The primary member of 2 Camelopardalis, designated component A, is an A-type main-sequence star with a spectral type of A8V. It has an apparent magnitude of 5.86, and has a secondary with an apparent magnitude of 7.35, designated component B.{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|accessdate=4 April 2017|archive-date=30 April 2017|archive-url=https://web.archive.org/web/20170430161106/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}} The two orbit each other on a very eccentric orbit with a period of 26.34 years. Further out, there is an eight-magnitude companion (designated component C), orbiting once every few hundred years. As the third star was previously thought to be relatively massive for its luminosity, it was suspected of being a binary star itself,{{Cite journal|doi=10.1086/117792|title=A Study of Multiple-Star Systems|journal=The Astronomical Journal|volume=111|pages=408|year=1996|last1=Heintz|first1=W. D.|bibcode=1996AJ....111..408H|doi-access=free}} but the current estimate of component C's magnitude as a single star matches its absolute magnitude.