Possible astrometric binary system in the constellation Lupus
! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | B−V 
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HR 5401 is a possible astrometric binary star system in the southern constellation of Lupus. With an apparent visual magnitude of 5.83, it is just visible to the naked eye under good seeing conditions. The distance to HR 5401 can be estimated from its annual parallax shift of , yielding a range of 205 light years. It is moving closer to Earth with a heliocentric radial velocity of −30 km/s, and is expected to come within in ~524,000 years.
This is an Am star with a stellar classification of A1m A5/7-F2. Lu (1991) lists it as a likely dwarf barium star. It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K. This system is a source of X-ray emission which may be coming from the companion.
HR 5401 has two visual companions. Component B is a magnitude 11.50 star at an angular separation of along a position angle (PA) of 114°, as of 1999. The second companion, designated component C, is magnitude 11.16 with a separation of at a PA of 164°, as of 2000.
References.
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