In theWashington Double Star Catalog LN And has a faint optical companion star with an apparent magnitude of 9.88,[5]7.5″ from LN And. The separation has increased from4.0″ when it was discovered as a double in 1828.[20] The two stars share the sameHipparcos identifier HIP 113802, and have very similarparallaxes andproper motions.[2][4]
In 1979, the blue magnitude of LN And was reported to vary by about 0.025 every 28 minutes. Such variability was not known for any class of variable, but the position in theHertzsprung–Russell diagram at themain sequence (low luminosity) end of the same instability strip as theβ Cephei stars would make high-overtone radial pulsations the likely cause.[13] LN And was added to theGeneral Catalogue of Variable Stars as LN Andromedae,[6] but follow-up studies failed to find the same rapid variations, or any significant variations in brightness and it is now listed as probably constant.[21][6]
Analysis ofHipparcos photometry shows variability of about 0.0059 magnitudes with a main period of3.25 d. The statistical threshold for these variations is at a level which is only met by 0.01% of stars.[3][clarification needed]
^abcCutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003)."VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)".CDS/ADC Collection of Electronic Catalogues.2246: II/246.Bibcode:2003yCat.2246....0C.
^"LN Andromedae".The International Variable Star Index. Retrieved2022-03-04.
^Shaw, J. S.; Fraquelli, D. A.; Martins, D. H.; Andrew, S. B. (1983). "HR 8768 - an Ultra Short Period Variable?".Information Bulletin on Variable Stars.2288: 1.Bibcode:1983IBVS.2288....1S.
