Astronomy:HJ 4093

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Short description: Quadruple star system in the constellation Puppis
HJ 4093
Location of HJ 4093 (circled)
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Puppis[1][2]
HD 71487
Right ascension  08h 26m 17.7301s[3]
Declination −39° 03′ 32.258″[3]
Apparent magnitude (V) 6.49±0.01
(6.588 + 8.96)[4]
primary eclipse: 6.98[5]
secondary ecl.: 6.66[5]
HD 71488
Right ascension  08h 26m 18.3057s[6]
Declination −39° 03′ 36.747″[6]
Apparent magnitude (V) 7.40[4]
(7.900 + 8.10)[7]
Characteristics
HD 71487
Evolutionary stage Main sequence[4]
Spectral type B9V + A7V[4]
B−V color index −0.11[4]
Variable type Eclipsing binary[8]
HD 71488
Evolutionary stage Main sequence[4]
Spectral type A5V + A6V[4]
B−V color index +0.30[4]
Astrometry
HD 71487
Radial velocity (Rv)+25.4±0.6[9] km/s
Proper motion (μ) RA: −7.896[3] mas/yr
Dec.: +5.975[3] mas/yr
Parallax (π)5.7991 ± 0.0304[3] mas
Distance562 ± 3 ly
(172.4 ± 0.9 pc)
Absolute magnitude (MV)+0.258±0.409[4]
HD 71488
Proper motion (μ) RA: −6.1±2.0 mas/yr
Dec.: +10.4±2.9 mas/yr
Position (relative to HD 71487)[7]
ComponentHD 71488
Epoch of observation2015
Angular distance8.1″
Position angle124°
Orbit[4]
PrimaryHD 71487 A
CompanionHD 71487 B
Period (P)1.2569956(9) days
Semi-major axis (a)0.03956±0.00023 au
(8.51±0.05 R☉)
Eccentricity (e)0.127±0.027
Inclination (i)81.33±0.20°
Semi-amplitude (K1)
(primary)		109.9±0.9 km/s
Semi-amplitude (K2)
(secondary)		232.1±1.5 km/s
Orbit[4]
PrimaryHD 71488 A
CompanionHD 71488 B
Period (P)101.3±3.8 years
Semi-major axis (a)0.179±0.012"
(34.4 au)
Eccentricity (e)0.054±0.041
Inclination (i)155±13°
Longitude of the node (Ω)47±71°
Periastron epoch (T)1976.23±13.06
Argument of periastron (ω)
(secondary)		318±74°
Details[4]
HD 71487 A
Mass3.58±0.11 M☉
Radius2.17±0.03 R☉
Luminosity133±24 L☉
Surface gravity (log g)4.3±0.1 cgs
Temperature13,300±500 K
Metallicity [Fe/H]−0.02±0.01 dex
Rotation1.32 days
Rotational velocity (v sin i)65±5 km/s
Age20 Myr
HD 71487 B
Mass1.68±0.09 M☉
Radius1.51±0.06 R☉
Luminosity6.2±2.2 L☉
Surface gravity (log g)4.2±0.1 cgs
Temperature7,400±500 K
Metallicity [Fe/H]−0.08±0.03 dex
Rotational velocity (v sin i)64±2 km/s
Age20 Myr
HD 71488 A
Mass2.0 M☉
Age20 Myr
HD 71488 B
Mass1.8 M☉
Age20 Myr
Other designations
HJ 4093, B 1605, CD−38°4462, HIP 41361, CCDM J08263-3904, WDS J08263-3904[10][11]
HD 71487: NO Puppis, HR 3327, SAO 199222, TYC 7661-4332-1[10]
HD 71488: HR 3328, SAO 199224, TYC 7661-4332-2[11]
Database references
SIMBADHD 71487
HD 71488

HJ 4093 (WDS J08263-3904) is a star system in the constellation Puppis. It comprises HD 71487 and HD 71488, which together form a visual binary and are themselves close binary systems, making HJ 4093 a four-star system. They are separated by about 1,400 astronomical units, having an estimated orbital period in the order of 10,000 years.[4] The combined apparent magnitude is 6.07,[12] making the system (faintly) visible to the naked eye only in ideal conditions, within places far from light pollution.[13]

Parallax measurements by the Gaia spacecraft place HJ 4093 at a distance of 172±1 parsecs (562±3 light-years).[3][lower-alpha 1] The system is very young, at 20 million years old,[4] and is part of an unnamed stellar association.[14]

HD 71487

A light curve for NO Puppis, plotted from TESS data[15]

HD 71487, also called HJ 4093 A and more frequently NO Puppis,[9][4][12] is an eclipsing binary with an orbital period of 1.256 days.[4] The overall apparent magnitude is 6.49,[4] and during the primary (deeper) and secondary eclipse it drops to 6.98 and 6.66, respectively.[5] The variability of this system was announced in 1972 by B. G. Jorgensen.[16] When using a designation about the entire system (e.g. HJ 4093), the primary and secondary are referred to as Aa and Ab, respectively,[7] but when using a specific designation (e.g. HD 71487) they may simply be called "A" and "B".[lower-alpha 2]

The components have stellar classifications of B8V and A7V, suggesting they are hot main sequence stars. NO Puppis A has 3.58 times the mass (M☉) and 2.17 times the radius (R☉), while NO Puppis B has 1.68 times the mass and 1.51 times the radius of the Sun. The effective temperature of A is 13,300 K,[4] giving it the blue-white hue typical of a late B-type star,[17] while that of component B is 7,400 K,[4] giving it the whitish hue typical of a late A-type star.[17] NO Puppis A lies in the instability strip of slowly pulsating B-type stars and is likely of this variable star class, while NO Puppis B lies in the instability strip of Delta Scuti variables and appears to exhibit δ Scuti-like pulsations.[4]

The stars are separated by 8.5 R☉ and have an orbital eccentricity of 0.13, which is unusually high for such a close binary system, given that an orbit with such a separation would be expected to be nearly circular. At some point the system may have had several more components that were ejected due to gravitational perturbations, inducing a high eccentricity for this system.[4]

HD 71488

HD 71488, also called HJ 4093 B, is an astrometric binary system with an apparent magnitude is 7.27. The components have an orbital period of 100 years.[4] When using a designation about the entire system (e.g. HJ 4093), the primary and secondary are referred to as Ba and Bb, respectively, or sometimes as B and C, as in CCDM J08263-3904BC.[11] When using a specific designation (e.g. HD 71488) they can be called simply "A" and "B". HD 71488 A is expected to have a spectral type of A5V and an estimated mass of 2.0 M☉, while HD 71488 B would have a spectral type of A6V and an estimated 1.8 times the mass of the Sun,[4] although direct observations give a combined spectral class of A2Va.[18]

Notes

  1. ↑ The distance of 173.7173 parsecs published in Gaia DR3 is based on spectra rather than parallax.
  2. ↑ NO Puppis, while originally used only for HD 71487,[12] is sometimes applied to the entire system, as in Erdem et al. (2025).[4] In this situation, the components are named NO Puppis Aa and NO Puppis Ab.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 4.19 4.20 4.21 4.22 4.23 Erdem, Ahmet; Bakış, Volkan; Southworth, John; Rhodes, Michael D.; Aliçavuş, Filiz Kahraman; Budding, Edwin; Blackford, Mark; Banks, Timothy et al. (2025-08-07). "Absolute Parameters of Young Stars: NO Puppis". Publications of the Astronomical Society of Australia 42. doi:10.1017/pasa.2025.10080. Bibcode: 2025PASA...42..120E. 
  5. ↑ 5.0 5.1 5.2 "NO Pup". http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=NO+Pup. 
  6. ↑ 6.0 6.1 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002-03-01). "The Tycho double star catalogue" (in en). Astronomy & Astrophysics 384 (1): 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F. 
  7. ↑ 7.0 7.1 7.2 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.  HJ 4093's database entry at VizieR.
  8. ↑ "VSX : Detail for V0410 Pup". https://vsx.aavso.org/index.php?view=detail.top&oid=27012. 
  9. ↑ 9.0 9.1 Veramendi, M. E.; González, J. F. (2014-03-01). "Spectroscopic study of early-type multiple stellar systems - I. Orbits of spectroscopic binary subsystems" (in en). Astronomy & Astrophysics 563: A138. doi:10.1051/0004-6361/201322840. ISSN 0004-6361. Bibcode: 2014A&A...563A.138V. 
  10. ↑ 10.0 10.1 "HD 71487". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+71487. 
  11. ↑ 11.0 11.1 11.2 "HD 71488". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+71488. 
  12. ↑ 12.0 12.1 12.2 Grønbech, B. (1976). "Four color photometry of eclipsing binaries. V: Photometric elements of NO Puppis." (in en). Astronomy and Astrophysics 50: 79–84. ISSN 0004-6361. Bibcode: 1976A&A....50...79G. 
  13. ↑ "Limiting Magnitude | COSMOS". https://astronomy.swin.edu.au/cosmos/l/Limiting+Magnitude. 
  14. ↑ Tokovinin, A. A.; Chalabaev, A.; Shatsky, N. I.; Beuzit, J. L. (1999). "A near IR adaptive optics search for faint companions to early-type multiple stars" (in en). Astronomy and Astrophysics 346: 481–486. ISSN 0004-6361. Bibcode: 1999A&A...346..481T. 
  15. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  16. ↑ Jorgensen, B. G. (March 14, 1972). written at Budapest. "HR 3327 - an Eclipsing Binary with Eccentric Orbit". Information Bulletin on Variable Stars (Konkoly Observatory) 641: 1. Bibcode: 1972IBVS..641....1J. https://ibvs.konkoly.hu/pub/ibvs/0601/0641.pdf. 
  17. ↑ 17.0 17.1 "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16. 
  18. ↑ Gray, R. O.; Garrison, R. F. (1987). "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series 65: 581. doi:10.1086/191237. Bibcode: 1987ApJS...65..581G. 

Coordinates: Sky map 08h 26m 17.7301s, −39° 03′ 32.258″



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