| Coord 2000 | 02537+3820 | Discov num | BU 524 | Comp | AB | Coord arcsec 2000 | 02 53 42.58 +38 20 15.6 | ||||
| Date first | 1878 | Date last | 2015 | Obs | 225 | ||||||
| Pa first | 6 | Pa last | 290.2 | P.A. Now (θ) | 233.3° | ||||||
| Sep first | 0.3 | Sep last | 0.225 | Sep. Now (ρ) | 0.148" | ||||||
| Mag pri | 5.79 | Mag sec | 6.80 | delta mag (ΔM) | 1.01 | Spectral class | F4IV (yellow-white) | ||||
| Pri motion ra | +050 | Sec motion ra | |||||||||
| Pri motion dec | -078 | Sec motion dec | |||||||||
| Notes | N O (See Notes, Orbital solution) | ||||||||||
| Show | name | SAO | coord | wds_name | last | obs | pa | sep | mag1 | mag2 | d_mag | orb | current | 
| Show | 55975 | 02 53 43 +38 20 16 | BU 524 AB | 2015 | 225 | 290 | 0.2 | 5.79 | 6.80 | 1.01 | Y | <=== | |
| Show | 20 Per | 55975 | 02 53 43 +38 20 16 | STF 318 AB,C | 2021 | 44 | 237 | 13.9 | 5.39 | 9.68 | 4.29 | ||
| Show | 55975 | 02 53 43 +38 20 16 | STF 318 AB,D | 2002 | 6 | 40 | 58.1 | 5.39 | 12.60 | 7.21 | 
| Var name | NSV977 Per | Constellation | Perseus | SAO | 55975 | HIP | 13490 | ||||
| Tycho2 | 2846-01428-1 | Gaia DR2 | 143119137916819456 | HD | 17904 | HR | 855 | ||||
| GC | 3459 | ADS | 2200 | BD | BD+37 655 | Flamsteed | 20 Persei | ||||
| Flamsteed name | 20 Per | Distance | 70.67 | Distance ly | 230.53 | 
| Period (P) | 11553.9d (31.63y) | ± 8.7 | Periastron (T) | 50255m (1996.471y) | ± 12 | Semi-major axis (a) | 0.2224a | ± 0.0011 | 
| Eccentricity (e) | 0.756 | ± 0.0023 | Inclination (i) | 120.48° | ± 0.2 | Longitude of periastron (ω) | 265.54° | ± 0.11 | 
| Node (Ω) | 26.62° | ± 0.24 | Notes | n | Reference | Mut2010b | ||
| Equinox | 2000 | Last observation | 2008 | Grade | 2 | (1=Definitive, 9=Indet.) | 
| 
 |  | Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.  Measures: green=micrometric, blue=interferometric, purple=photographic |  | 
| discov_num | notes | refcode | 
| BU 524 | AB: 20 Per. Barnard gives this as 20 Per = BU 520. | Bar1898b | 
| Star A is a suspected variable of Delta Scuti type. A suspected | ||
| spectroscopic 3.5 yr period is not confirmed (Scarfe & Fekel 1978). | Scf1978 | |
| A measure on 1979.5326 was incorrectly attributed to ADS 2200 by | ||
| McAlister & Hendry (1982); it actually belongs to ADS 490. | McA1982d | |
| See Baize & Petit (1989) catalog of doubles with variable component. | Baz1989d | |
| Aristidi et al. (1999) orbit includes mass determination. | Ari1999 | |
| Docobo et al. (2001) orbit includes mass determination. | Doc2001c | |
| Calculated mass sum is 3.88 +/- 0.58 Msun, a bit high for a pair of | ||
| mid-F dwarfs. | Mut2010b | |
| AB: Malkov et al. (2012) derive dynamical, photometric, and | ||
| spectroscopic masses 3.88 +/- 0.60, 2.99, and 1.38 Msun, respectively. | Mlk2012 | |
| STF 318 | AB,C: HJL 43. | HJL1986 | 
| AB,C: H 3 60. | MEv2010 | 
| refcode | metd | author | reference | 
| Ari1999 | S j | Aristidi, E., Prieur, J.-L., Scardia, M., Koechlin, L., Avila, R., Carbillet, M., | 1999A&AS..134..545A | 
| Ari1999 | +orb | Lopez, B., Rabbia, Y., et al. | |
| Ari1999 | A&AS 134, 545, 1999 | ||
| Bar1898b | Ma j | Barnard, E.E. | 1898AJ.....19..113B | 
| Bar1898b | AJ 19, 113, 1898 | ||
| Baz1989d | - | Baize, P. & Petit, M. | 1989A&AS...77..497B | 
| Baz1989d | A&AS 77, 497, 1989 | ||
| Doc2001c | S j | Docobo, J.A., Tamazian, V.S., Balega, Y.Y., Blanco, J., Maximov, A.F., & | 2001A&A...366..868D | 
| Doc2001c | +orb | Vasyuk, V.A. | |
| Doc2001c | A&A 366, 868, 2001 | ||
| HJL1986 | Pa - | Halbwachs, J.L. | 1986A&AS...66..131H | 
| HJL1986 | A&AS 66, 131, 1986 | ||
| HJL1986 | (Possible CPM pairs from AGK2/3. Coarse astrometry, incl. mean 1950 dates, added | ||
| HJL1986 | only for previously unknown pairs. Table 1: HJL 1 - 326, Table 2: HJL1001 - 1113) | ||
| McA1982d | Sc j | McAlister, H.A. & Hendry, E.M. | 1982ApJS...49..267M | 
| McA1982d | ApJS 49, 267, 1982 | ||
| MEv2010 | - | MacEvoy, B. | ................... | 
| MEv2010 | private communication, 2010 (see http://www.handprint.com/ASTRO/index.html) | ||
| Mlk2012 | not - | Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. | 2012A&A...546A..69M | 
| Mlk2012 | A&A 546, A69, 2012 | ||
| Mut2010b | Kp - | Muterspaugh, M.W., Hartkopf, W.I., Lane. B.F., O'Connell, J., Williamson, M., | 2010AJ....140.1623M | 
| Mut2010b | Kulkarni, S.R., Konacki, M., Burke, B.F., Colavita, M.M., Shao, M., & | ||
| Mut2010b | Wiktorowicz, S.J. | ||
| Mut2010b | AJ 140, 1623, 2010 | ||
| Scf1978 | - | Scarfe, C.D. & Fekel, F.C. | 1978PASP...90..297S | 
| Scf1978 | PASP 90, 297, 1978 | 
| discov | author | 
| ARI | Aristidi, E., Carbillet, M., Prieur, J.-L., Lopez, B., Bresson, Y., & Koechlin, L. | 
| ARI | Aristidi, E., Prieur, J.-L., Scardia, M., Koechlin, L., Avila, R., Carbillet, M., | 
| ARI | Lopez, B., Rabbia, Y., et al. | 
| DOC | Docobo, J.A., Andrade, M., Ling, J.F., Prieto, C., Tamazian, V.S., Balega, Yu.Yu., | 
| DOC | Blanco, J., Maximov, A.F., et al. | 
| DOC | Docobo, J.A., Tamazian, V.S., Andrade, M., Ling, J.F., Balega, Y.Y., | 
| DOC | Lahulla, J.F., & Maximov, A. | 
| DOC | Docobo, J.A., Tamazian, V.S., Balega, Y.Y., Andrade, M., Schertl, D., Weigelt, G., | 
| DOC | Campo, P., & Palacios, M. | 
| DOC | Docobo, J.A., Tamazian, V.S., Andrade, M., Ling, J.F., Balega, Y.Y., | 
| DOC | Lahulla, J.F., & Maximov, A. | 
| DOC | Highlights of Spanish Astrophysics V, Ap&SS Proc. (Springer-Verlag, Berlin), | 
| DOC | p 491, 2010 (no data) | 
| HJL | Halbwachs, J.L., Boffin, H.M.J., Le Bouquin, J.-B., Kiefer, F., Famaey, B., | 
| HJL | Salomon, J.-B., Arenou, F., Pourbaix, D., Anthonioz, F., Grellmann, R., Guieu, S., | 
| HJL | Sana, H., et al. | 
| HJL | Halbwachs, J.-L., Kiefer, F., Lebreton, Y., Boffin, H.M.J., Arenou, F., LeBouquin, | 
| MCA | McAlister, H.A. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Konacki, M., Burke, B.F., Colavita, M.M., | 
| MUT | Kulkarni, S.R., & Shao, M. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Konacki, M., Wiktorowicz, S., Burke, B.F., | 
| MUT | Colavita, M.M., Kulkarni, S.R., & Shao, M. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Konacki, M., Burke, B.F., Colavita, M.M., | 
| MUT | Kulkarni, S.R., & Shao, M. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Fekel, F.C., Konacki, M., Burke, B.F., | 
| MUT | Kulkarni, S.R., Colavita, M.M., Shao, M., & Wiktorowicz, S.J. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Kulkarni, S.R., Konacki, M., Burke, B.F., | 
| MUT | Colavita, M.M., Shao, M., & Wiktorowicz, S.J. | 
| MUT | AJ 140, 1579, 2010 (some data also in Mut2005, Mut2006, | 
| MUT | Mut2006b, Lne2007, or Mut2008) | 
| MUT | Muterspaugh, M.W., Hartkopf, W.I., Lane. B.F., O'Connell, J., Williamson, M., | 
| MUT | Kulkarni, S.R., Konacki, M., Burke, B.F., Colavita, M.M., Shao, M., & | 
| MUT | Muterspaugh, M.W., Lane. B.F., Kulkarni, S.R., Konacki, M., Burke, B.F., | 
| MUT | Colavita, M.M., & Shao, M. | 
| MUT | Muterspaugh, M.W., Fekel, F.C., Lane, B.F., Hartkopf, W.I., Kulkarni, S.R., | 
| MUT | Konacki, M., Burke, B.F., Colavita, M.M., Shao, M., & Williamson, M. | 
| MUT | Muterspaugh, M.W., Lane, B.F., Kulkarni, S.R., Konacki, M., Burke, B.F., | 
| MUT | Colavita, M.M., Shao, M., Hartkopf, W., Boss, A.P., & Williamson, M. | 
| MUT | Muterspaugh, M.W., Mijngaarden, M.J.P., Henrichs, H.F., Lane, B.F., Hartkopf, W., | 
| MUT | Henry, G.W., Schaefer, G.H., Farrington, C., Hummel, C.A., & Zavala, R.T. | 
| SCF | Scarfe, C., Barlow, D., McAlister, H., Hartkopf, W., Fekel, F., Rees, R., | 
| SCF | Lyons, R., & Bolton, C. | 
| SCF | Scarfe, C., Barlow, D., Fekel, F., Rees, R., Lyons, R., Bolton, C., McAlister, H., | 
| SCF | & Hartkopf, W. | 
| coord_2000 | discov_num | comp | epoch | obs | pa | sep | mag_pri | mag_sec | spectr | dm_number | notes | coord_arcsec_2000 | 
| 02537+3820 | BU 524 | AB | 2007 | 170 | 325 | 0.2 | 5.79 | 6.80 | F4IV | +37 655 | NOD | 025342.58+382015.6 | 
| 02537+3820 | BU 524 | AB | 2008 | 222 | 321 | 0.2 | 5.79 | 6.80 | F4IV | +37 655 | NOD | 025342.58+382015.6 | 
| 02537+3820 | BU 524 | AB | 2009 | 223 | 319 | 0.2 | 5.79 | 6.80 | F4IV | +37 655 | NO | 025342.58+382015.6 | 
| 02537+3820 | BU 524 | AB | 2015 | 225 | 290 | 0.2 | 5.79 | 6.80 | F4IV | +37 655 | NO | 025342.58+382015.6 | 
| Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. | 
| Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 
 |  | 
| A | B | C | |
| B | pa=290.2° sep=0.23" | ||
| C | pa=236.7° sep=13.91" | pa=235.9° sep=13.78" | |
| D | pa=40.0° sep=58.10" | pa=40.2° sep=58.18" | pa=43.2° sep=71.54" | 
| Coord arcsec 2000 | 025342.58+382015.6 | Mag | 5.79 | Spectral class | F4IV (yellow-white) | PmRA | 50.00 | ||||
| PmDE | -78.0 | SAO | 55975 | HIP | 13490 | Tycho2 | 2846-01428-1 | ||||
| HD | 17904 | HR | 855 | GC | 3459 | BD | BD+37 655 | ||||
| Flamsteed | 20 Persei | Flamsteed name | 20 Per | 
| Tycho2 | 2846-01428-1 | Pflag | RAmdeg | 43.42756675 | DEmdeg | 38.33748295 | |||||
| PmRA | 51.3 | PmDE | -80.9 | E RAmdeg | 4 | E DEmdeg | 4 | ||||
| E pmRA | 1.4 | E pmDE | 1.3 | EpRAm | 1991.58 | EpDEm | 1991.46 | ||||
| Num | 11 | Q RAmdeg | 1.2 | Q DEmdeg | 1.2 | Q pmRA | 1.3 | ||||
| Q pmDE | 1.2 | BTmag | 5.818 | E BTmag | 0.014 | VTmag | 5.391 | ||||
| E VTmag | 0.010 | Prox | 999 | TYC | T | HIP | 13490 | ||||
| CCDM | AB | RAdeg | 43.42741611 | DEdeg | 38.33767167 | EpRA 1990 | 1.71 | ||||
| EpDE 1990 | 1.60 | E RAdeg | 3.8 | E DEdeg | 4.1 | Posflg | P | ||||
| Corr | -0.1 | 
| SAO | 55975 | DelFlag | RA1950 | PmRA1950 | 0.004 | ||||||
| DE1950 | PmDE1950 | -0.074 | Vmag | 5.3 | SpType | F0 | |||||
| Double code | Source | 70 | CatNum | 3459 | DM | BD+37 655 | |||||
| DMcomp | BDsup | HD | 17904 | M HD | 0 | ||||||
| GC | 3459 | RA1950rad | 0.74414352 | DE1950rad | 0.66558489 | PmRA2000 | 0.004 | ||||
| PmDE2000 | -0.077 | 
| Catalog | H | HIP | 13490 | Proxy | H | RAhms | 02 53 42.58 | ||||
| DEdms | +38 20 15.6 | Vmag | 5.34 | VarFlag | R Vmag | H | |||||
| RAdeg | 43.4274 | DEdeg | 38.3377 | AstroRef | * | Plx | 13.87 | ||||
| CCDM | 47.62 | N CCDM | I | Nsys | 1 | Ncomp | 2 | ||||
| MultFlag | C | Source | S | Qual | A | M HIP | AB | ||||
| Theta | 250 | Rho | 0.171 | HD | BD | BD+37 655 | |||||
| CD | CP | Dm number | +37 655 | VIred | 0.48 | ||||||
| SpType | F4Vvar | R SpType | Coord arcsec 2000 | 025342.58+382015.6 | 
| HIP | 13490 | Sn | 55 | So | 3 | Nc | 2 | ||||
| RArad | 0.7579512643 | DErad | 0.6691187219 | Plx | 14.15 | PmRA | 46.79 | ||||
| PmDE | -78.9 | E RArad | 0.61 | E DErad | 0.46 | E Plx | 0.72 | ||||
| E pmRA | 0.62 | E pmDE | 0.61 | Hpmag | E Hpmag | 0.0013 | |||||
| SHp | 0.007 | VA | 0 | BV | 0.423 | E BV | 0.005 | ||||
| VI | 0.49 | 
| Ccdm | 02537+3820 | RComp | Comp | A | Note1 | ||||||
| Note2 | Discov num | DRAs | 0.65 | DDEs | 15.0 | ||||||
| R dRAs | 10 | Year | Theta | Rho | |||||||
| Obs | 4 | Vmag | 5.6 | Sp | F0 | PmNote | * | ||||
| PmRA | 60 | PmDE | -75 | Dm number | +37 655 | Cat1 | BD | ||||
| Name2 | +38 324 | Cat2 | AGK2/3 | HD | 17904 | M HD | |||||
| ADS BDS | A 2200 | M ADS BDS | N IDS | IDS | 02474N3756A | ||||||
| HIC | 13490 | 
| Coord arcsec 2000 | 025342.56+382015.7 | Mag | 6.8 | Delta magnitude | 1.01 | Coordinate calculated | yes | 
| Ccdm | 02537+3820 | RComp | Comp | B | Note1 | * | |||||
| Note2 | Discov num | BU 524 | DRAs | DDEs | |||||||
| R dRAs | Year | 1880 | Theta | Rho | |||||||
| Obs | 99 | Vmag | 6.7 | Sp | PmNote | ||||||
| PmRA | PmDE | Dm number | Cat1 | ||||||||
| Name2 | Cat2 | HD | M HD | ||||||||
| ADS BDS | A 2200 | M ADS BDS | N IDS | IDS | 02474N3756B | ||||||
| HIC | 13490 | 
| Coord arcsec 2000 | 025341.59+382008.0 | Mag | 9.68 | PmRA | 33.00 | PmDE | -86.0 | ||||
| Delta magnitude | 3.89 | Coordinate calculated | yes | 
| Ccdm | 02537+3820 | RComp | Comp | C | Note1 | ||||||
| Note2 | Discov num | STF 318 | DRAs | -0.45 | DDEs | 6.8 | |||||
| R dRAs | 10 | Year | 1829 | Theta | 237 | Rho | 14.1 | ||||
| Obs | 15 | Vmag | 10.0 | Sp | PmNote | * | |||||
| PmRA | 39 | PmDE | -88 | Dm number | Cat1 | ||||||
| Name2 | +38 323 | Cat2 | AGK2/3 | HD | M HD | ||||||
| ADS BDS | A 2200 | M ADS BDS | N IDS | IDS | 02474N3756C | ||||||
| HIC | 
| Coord arcsec 2000 | 025345.75+382100.1 | Mag | 12.6 | Delta magnitude | 6.81 | Coordinate calculated | yes | 
| Ccdm | 02537+3820 | RComp | Comp | D | Note1 | ||||||
| Note2 | Discov num | STF 318 | DRAs | 3.84 | DDEs | 58.2 | |||||
| R dRAs | 65 | Year | 1913 | Theta | 049 | Rho | 56.2 | ||||
| Obs | 1 | Vmag | Sp | PmNote | |||||||
| PmRA | PmDE | Dm number | Cat1 | ||||||||
| Name2 | Cat2 | HD | M HD | ||||||||
| ADS BDS | A 2200 | M ADS BDS | N IDS | IDS | 02474N3756D | ||||||
| HIC |