1 Camelopardalis

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

{{Starbox image

| image=

{{Location mark

|image=Camelopardalis constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=1 Cam

|x=704|y=1033

}}

|caption=Location of 1 Camelopardalis (circled)

}}

{{Starbox observe 2s

| epoch = J2000

| constell = Camelopardalis

| component1 = 1 Cam A

| ra1 = {{RA|04|32|01.841}}

| dec1 = {{DEC|+53|54|39.02}}

| appmag_v1 = 5.77

| component2 = 1 Cam B

| ra2 = {{RA|04|32|00.915}}

| dec2 = {{DEC|+53|54|45.35}}

| appmag_v2 = 6.803

}}

{{Starbox character

| component1 = 1 Cam A

| class = O9.7IIn

| r-i =

| v-r =

| b-v = +0.18

| u-b = −0.73

| variable = SPB?

| component2 = 1 Cam B

| class2 = B1IV:

| r-i2 =

| v-r2 =

| b-v2 = +0.16

| u-b2 = −0.70

| variable2 =

}}

{{Starbox astrometry

| component1 = 1 Cam A

| prop_mo_ra = +2.775

| prop_mo_dec = −3.783

| parallax = 1.2630

| p_error = 0.0486

| parallax_footnote =

| component2 = 1 Cam B

| prop_mo_ra2 = +0.775

| prop_mo_dec2 = −3.211

| parallax2 = 1.1211

| p_error2 = 0.0462

| parallax_footnote2 =

| absmag_v2 = −5.53

}}

{{Starbox detail

| component1 = 1 Cam A

| mass =

| radius =

| luminosity = 4,365

| gravity = 3.65

| temperature = 29,800

| metal =

| rotational_velocity = 275

| component2 = 1 Cam B

| mass2 =

| radius2 =

| luminosity2 = 1,995

| gravity2 =

| temperature2 = 29,512

| metal_fe2 =

| rotational_velocity2 = 11

| age_myr2 = <20

}}

{{Starbox catalog

| names = DL Camelopardalis, HR 1417, HD 28446, SAO 24672, BD+53°779, FK5 165, WDS J04320+5355, HIP 21148

}}

{{Starbox reference

| Simbad = HD+28446

| Simbad2 = 1+Cam+A|sn2=1 Cam A

| Simbad3 = 1+Cam+B|sn3=1 Cam B

}}

1 Camelopardalis (1 Cam) is a double star system in the constellation Camelopardalis. Its combined apparent magnitude is 5.56 and it is approximately {{convert|800|pc|ly}} away. It is faintly visible to the naked eye under good observing conditions.

The 1 Camelopardalis system is part of the Camelopardalis OB1 stellar association, which is 820 pc away. 1 Camelopardalis A is a hot massive star which has evolved away from the main sequence to become a giant. It was once reported to be a double-lined spectroscopic binary with an orbital period of 1.31 days, but this has not been confirmed since. 1 Camelopardalis B is 10" away and is probably an early B class subgiant. An additional star was discovered using the CHARA array, and has a mean separation from 1 Camelopardalis A of 26.16 mas.

There is an 11th magnitude star 150" away. It has been considered to be a member of a triple system, but Gaia observations show it to be an unrelated background object.

File:DLCamLightCurve.png for DL Camelopardalis, plotted from TESS data]]

In 1982, Mikołaj Jerzykiewicz and Christiaan L. Sterken reported that 1 Camelopardalis might be a variable star, but some subsequent studies failed to confirm that. Its brightness was convincingly shown to be variable when the Hipparcos data was analyzed. It was given its variable star designation, DL Camelopardalis, in 1999. 1 Camelopardalis A is a variable star with a small amplitude. It has a likely period of 0.22132 days and is thought to be a β Cephei variable or slowly pulsating B-type star. Hipparcos photometry shows an amplitude of 0.035 magnitudes. It has a rotational velocity of {{val|275|u=km/s}}, one of the highest known.

References

{{Reflist|refs=

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}}

Category:Camelopardalis

Category:O-type bright giants

Category:B-type subgiants

Category:Beta Cephei variables

021148

BD+53 0779

Category:Binary stars