Close stellar conjunctions of α Centauri A and B until 2050 - An mK = 7.8 star may enter the Einstein ring of α Cen A in 2028

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Table 2

Positions of α Cen A and B in the ICRS coordinate frame.

Date	Band	MJD^a	Star	RA	Dec	σ [″] ^b	Instrument

1991-04-02	H_p	48 348.250	α Cen A	14:39:40.8985	−60:50:06.530	0.001	Hipparcos^c
2000-03-12	K _s	51 615.383	α Cen A	14:39:36.394	−60:50:03.31	0.20	2MASS^d
2009-02-25	J _s	54 887.356	α Cen A	14:39:31.813	−60:50:00.01	0.07	SOFI

1991-04-02	H _p	48 348.250	α Cen B	14:39:39.3908	−60:50:22.097	0.046	Hipparcos^c
2000-03-12	K _s	51 615.383	α Cen B	14:39:35.103	−60:50:13.56	0.20	2MASS^d
2009-02-25	J_s	54 887.356	α Cen B	14:39:30.919	−60:50:03.48	0.07	SOFI

Notes.

^(a)

MJD is the average modified julian date of the measurement.

^(b)

σ is the estimated position uncertainty in arcseconds.

^(c)

Positions taken from the original Hipparcos catalog (ESA 1997).

^(d)

The listed 2MASS coordinates are measured from the Atlas image in the K_s band.

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