Double Marathon Observing List by: Glenn Chaple, 2016 R.A. (2000) Dec. PSA Num Object Con SAO # Mags. Sep (“) PA (°) Notes Time Eyepiece/Comments h m deg min no lbl 1 STF 3053 CAS 010938 00 02.6 +66 06 6.0, 7.2 15.0 70 HR 9094 1 2 alpha Cas CAS 021609 00 40.5 +56 32 2.4, 9.0 69.5 282 Shedir 3 3 eta Cas CAS 021732 00 49.1 +57 49 3.4, 7.5 12.0 307 Achird 3 4 STF 163 CAS 012006 01 51.3 +64 51 6.8, 9.1 33.9 36 HD 11092 1 5 gamma Ari ARI 092680 01 53.5 +19 18 4.8, 4.8 7.8 0 Mesarthim 4 6 lambda Ari ARI 075051 01 57.9 +23 36 4.9, 7.7 37.7 46 4 7 gamma And AND 037734 02 03.9 +42 20 2.3, 5.5 9.8 63 Almaak 2 8 iota Tri TRI 055347 02 12.4 +30 18 5.3, 6.9 3.9 71 6 Tri 2 9 alpha UMi UMI 000308 02 31.8 +89 16 2.0, 9.0 18.4 218 Polaris 1 10 eta Per PER 023655 02 50.7 +55 54 3.8, 8.5 28.3 300 Miram & a 9.9* @ 66" 2 11 STF 331 PER 023763 03 00.9 +52 21 5.3, 6.7 12.1 85 HR 890 13 12 32 Eri ERI 130805 03 54.3 -02 57 4.8, 6.1 6.8 347 17 13 STF 485 CAM 013030 04 07.8 +62 20 6.9, 6.9 17.7 305 HR 1260/in OC NGC 1502 11 14 omi2 Eri ERI 131063 04 15.3 -07 39 4.4, 9.7 83.0 104 Keid 17 15 chi Tau TAU 076573 04 22.6 +25 38 5.5, 7.6 19.4 24 15 16 1 Cam CAM 024672 04 32.0 +53 55 5.7, 6.8 10.3 308 near DN B12 12 17 55 Eri ERI 131442 04 43.6 -08 48 6.7, 6.8 9.2 317 west of 16 18 rho Orionis ORI 112528 05 13.3 +02 52 4.6, 8.5 7.1 64 14 19 beta Ori ORI 131907 05 14.5 -08 12 0.1, 6.8 9.5 202 Rigel 16 20 118 Tau TAU 077201 05 29.3 +25 09 5.8, 6.6 4.8 204 14 21 delta Ori ORI 132221 05 32.0 -00 18 2.2, 6.3 52.6 359 Minitaka 16 22 STF 747 ORI 132298 05 35.0 -06 00 4.8, 5.7 35.7 223 HR 1887 - Det B / D7 16 23 lambda Ori ORI 112921 05 35.1 +09 56 3.6, 5.5 4.4 43 Meissa 14 6.7, 7.9 8.8 31 Trapezium in M42 24 theta1 Ori ORI 132314 05 35.3 -05 23 6.7, 5.1 13.0 312 16 see PSA Det B, iDSA D7 6.7, 6.7 21.5 96 25 iota Ori ORI 132323 05 35.4 -05 55 2.8, 6.9 11.3 141 Nair al Saif - Det B / D7 16 26 STF 742 TAU 077313 05 36.4 +22 00 7.1, 7.5 4.0 274 HD 37013/E of M1/Crab 14 27 sigma Ori ORI 132406 05 38.7 -02 36 4.0, 7.5 12.9 84 16 4.0, 6.5 43.0 61 28 gamma Lep LEP 170759 05 44.5 -22 27 3.7, 6.3 96.0 350 16 R.A. (2000) Dec. PSA Num Object Con SAO # Mags. Sep (“) PA (°) Notes Time Eyepiece/Comments h m deg min no lbl 29 STF 817 ORI 113266 05 54.9 +07 02 8.7, 8.9 18.8 73 HD39758/S alpha Ori 14 not 30 epsilon Mon MON 113810 06 23.8 +04 36 4.5, 6.5 13.4 27 8 Mon 25 31 beta Mon MON 133316 06 28.8 -07 02 4.6, 5.0 7.1 133 27 5.0, 5.3 2.9 108 32 12 Lyn LYN 025939 06 46.2 +59 27 5.4, 7.3 8.7 308 A is a close 1.7" dbl 23 33 38 Gem GEM 096265 06 54.6 +13 11 4.7, 7.8 7.3 326 25 34 h3945 CMa CMA 173349 07 16.6 -23 19 5.0, 5.8 26.8 52 HR 2764 27 35 19 Lyn LYN 026311 07 22.9 +55 17 5.6, 6.5 14.8 315 bright DS east of R 23 36 alpha Gem GEM 060198 07 34.6 +31 53 1.9, 2.9 2.2 171 Castor 23 37 STF 1121 PUP 153142 07 36.6 -14 29 7.0, 7.3 7.4 305 HD 60997/mid OC M47 27 38 kappa Pup PUP 174199 07 38.8 -26 48 4.5, 4.7 9.9 318 HR 2949 / H(3) 27 27 NW 1 & 3 Pup 39 2 Pup PUP 153363 07 45.5 -14 41 6.0, 6.7 16.6 340 near 4 Pup 26 40 zeta Cnc CNC 097645 08 12.2 +17 39 5.1, 6.2 5.9 72 Tegmen/A is a 1.2" dbl 24 41 phi2 Cnc CNC 080187 08 26.8 +26 56 6.2, 6.2 5.2 218 24 42 iota Cnc CNC 080415 08 46.7 +28 46 4.2, 6.6 30.0 307 24 43 38 Lyn LYN 061391 09 18.8 +36 48 3.9, 6.6 2.7 229 22 44 zeta1 Ant ANT 200445 09 30.8 -31 53 6.1, 6.8 8.1 212 39 45 gamma Leo LEO 081298 10 20.0 +19 51 2.2, 3.5 4.4 122 Algieba 35 46 54 Leo LEO 081583 10 55.6 +24 45 4.5, 6.3 6.5 110 34 47 N Hya HYA 179967 11 32.3 -29 16 5.8, 5.9 9.2 210 HR 4443 / H(3) 96 36 48 delta Crv CRV 157323 12 29.9 -16 31 3.0, 9.2 24.2 214 Algorab 47 49 24 Com COM 100160 12 35.1 +18 23 5.2, 6.7 20.3 271 45 50 STF 1659 CRV 157384 12 35.7 -12 01 8.0, 8.3 27.5 352 HD 109556 / Stargate 47 51 STF 1664 VIR 157411 12 38.3 -11 31 7.8, 9.2 37.2 224 HD 109875/WNW of M104 47 52 STF 1669 CRV 157448 12 41.3 -13 01 5.9, 5.9 5.3 312 HR 4821 47 53 gamma Vir VIR 138917 12 41.7 -01 27 3.5, 3.5 3.6 293 Porrima 47 54 32 Cam CAM 002102 12 49.2 +83 25 5.3, 5.8 21.6 326 HR 4893 / STF1694 41 NE of PN IC3568 55 alpha CVn CVN 063256 12 56.0 +38 19 2.9, 5.5 19.4 229 Cor Caroli 43 56 zeta UMa UMA 028737 13 23.9 +54 56 2.3, 4.0 14.4 152 Mizar; Alcor @ 12' 43 57 3 Cen CEN 204916 13 51.8 -33 00 4.5, 6.0 7.9 106 east of 1 Cen 48 58 kappa Boo BOO 029045 14 13.5 +51 47 4.6, 6.6 13.4 236 Asellus Tertius 42 59 iota Boo BOO 029071 14 16.2 +51 22 4.9, 7.5 38.0 33 42 R.A. (2000) Dec. PSA Num Object Con SAO # Mags. Sep (“) PA (°) Notes Time Eyepiece/Comments h m deg min no lbl 60 STF 1835 BOO 120426 14 23.4 +08 27 5.0, 6.8 6.2 194 HR 5386 44 61 pi Boo BOO 101138 14 40.7 +16 25 4.9, 5.8 5.6 108 44 62 epsilon Boo BOO 083500 14 45.0 +27 04 2.5, 4.9 2.8 339 Izar 44 63 xi Boo BOO 101250 14 51.4 +19 06 4.7, 7.0 6.9 332 44 64 delta Boo BOO 064589 15 15.5 +33 19 3.5, 8.7 105.0 79 53 65 mu1, mu2 Boo BOO 064687 15 24.5 +37 23 4.3, 7.0 108.0 171 Alkalurops/mu2 is 2" dbl 53 66 delta Ser SER 101623 15 34.8 +10 32 4.2, 5.2 3.9 178 55 67 zeta CrB CRB 064834 15 39.4 +36 38 5.1, 6.0 6.3 305 53 68 beta Ser SER 101725 15 46.2 +15 25 3.7, 10.0 30.9 264 55 69 xi Sco SCO 159665 16 04.4 -11 22 4.8, 7.3 7.6 51 56 70 beta Sco SCO 159682 16 05.4 -19 48 2.6, 4.9 13.6 21 Graffias 57 71 kappa Her HER 101951 16 08.1 +17 03 5.3, 6.5 28.0 12 Marfik 55 72 nu Sco SCO 159763 16 12.0 -19 28 4.3, 6.4 41.0 337 Jabbah 57 73 sigma CrB CRB 065165 16 14.7 +33 52 5.6, 6.6 6.2 233 53 74 16, 17 Dra DRA 030013 16 36.2 +52 55 5.4, 6.4 3.4 108 17 Dra 52 5.4, 5.5 90.0 194 16 Dra 75 mu Dra DRA 030239 17 05.3 +54 28 5.7, 5.7 2.0 42 Arrakis 52 76 alpha Her HER 102680 17 14.6 +14 23 3.5, 5.4 4.7 107 Rasalgethi 54 77 delta Her HER 084951 17 15.0 +24 50 3.1, 8.2 8.9 236 Sarin 54 78 36 Oph OPH 185199 17 15.3 -26 36 5.1, 5.1 4.4 154 56 79 omicron Oph OPH 185238 17 18.0 -24 17 5.4, 6.9 10.3 355 56 80 rho Her HER 066000 17 23.7 +37 09 4.6, 5.6 4.1 316 52 81 nu Dra DRA 030447 17 32.2 +55 11 4.9, 4.9 62.0 312 Kuma 52 82 psi Dra DRA 008890 17 41.9 +72 09 4.9, 6.1 30.3 15 Dsiban 51 83 PZ4 (h5003) SGR 209553 17 59.1 -30 15 5.4, 7.0 5.8 107 HR 6693/also as PZ 6 67 W of gamma Sgr 84 40, 41 Dra DRA 008994 18 00.2 +80 00 5.7, 6.1 19.3 232 SE of epsilon UMi 61 85 95 Her HER 085648 18 01.5 +21 36 5.0, 5.1 6.3 258 65 86 70 Oph OPH 123107 18 05.5 +02 30 4.2, 6.0 2.8 72 65 87 100 Her HER 085753 18 07.8 +26 06 5.8, 5.8 14.2 183 south of omicron Her 65 88 epsilon1 Lyr LYR 067310 18 44.3 +39 40 5.0, 6.1 2.1 352 Double Double 3.5'sep 63 89 epsilon2 Lyr LYR 067315 18 44.3 +39 37 5.3, 5.4 2.4 82 Double Double 3.5'sep 63 90 zeta Lyr LYR 067321 18 44.8 +37 36 4.3, 5.9 44.0 150 63 91 beta Lyr LYR 067451 18 50.1 +33 22 3.4, 8.6 46.0 149 Sheliak 63 R.A. (2000) Dec. PSA Num Object Con SAO # Mags. Sep (“) PA (°) Notes Time Eyepiece/Comments h m deg min no lbl 92 SHJ 282 LYR 067566 18 54.9 +33 58 6.0, 7.7 45.0 350 STT 525 / HR 7140 63 93 theta Ser SER 124068 18 56.2 +04 12 4.5, 5.4 22.3 104 Alya 65 94 STF 2470 LYR 067870 19 08.8 +34 46 7.0, 8.4 13.6 268 HD 178849 63 95 STF 2474 LYR 067879 19 09.1 +34 36 6.8, 7.9 15.8 262 HR 7272 63 96 beta Cyg CYG 087301 19 30.7 +27 58 3.1, 5.1 34.4 54 Alberio 64 97 16 Cyg CYG 031899 19 41.8 +50 32 6.0, 6.2 39.1 134 62 98 57 Aql AQL 143898 19 54.6 -08 14 5.8, 6.5 36.0 170 east of GC Pal 11 66 99 h1470 CYG 069335 20 03.7 +38 20 7.4, 9.2 28.6 340 HD 190466/W of Basel 6 62 100 kappa Cep CEP 009665 20 08.9 +77 43 4.4, 8.3 7.2 120 71 101 gamma Del DEL 106475 20 46.7 +16 07 4.5, 5.5 9.6 268 64 102 61 Cyg CYG 070919 21 06.9 +38 45 5.2, 6.0 28.0 146 Piazzi's Flying Star 73 103 beta Cep CEP 010057 21 28.7 +70 34 3.2, 7.9 13.3 249 Alfirk 71 104 STF 2816 CEP 033626 21 39.0 +57 29 5.6, 7.7 11.7 121 HR 8281/at center of 73 5.6, 7.8 20.0 339 OC in nebula IC 1396 105 STF 2819 CEP 033626 21 40.4 +57 35 7.4, 8.6 12.7 59 HD 206482/E of STF 2816 73 106 epsilon Peg PEG 127029 21 44.2 +09 52 2.4, 8.4 142 320 Enif 75 107 xi Cep CEP 019827 22 03.8 +64 38 4.4, 6.5 7.7 277 Kurhah 71 108 delta Cep CEP 034508 22 29.2 +58 25 3.9, 6.3 41.0 192 71 109 8 Lac LAC 072509 22 35.9 +39 38 5.7, 6.5 22.4 186 72 110 sigma Cas CAS 035947 23 59.0 +55 45 5.0, 7.1 3.0 326 72 Chart References by: Jim K, 2017 st CDSA Taki Num Object CDSA 1 iDSA TriAtlas "B" no lbl 2nd no lbl no lbl no lbl 1 STF 3053 2 2 15, 7 B1 6, 1 2 alpha Cas 2 2 15 B25, 11 6 3 eta Cas 2 2 15 B25, 11 6 4 STF 163 2 2 15 B24, 9 6 5 gamma Ari 7, 6 7, 6 51, 50 B43, 44 17, 18 6 lambda Ari 7, 6 7, 6 32, 39 B43, 44 17, 18 7 gamma And 6 6 27, 26 B25, 24 18, 17 8 iota Tri 7, 6 7, 6 38 B43 17, 18 9 alpha UMi 1 1 1 B4, 1-9 1 10 eta Per 2, 3 2, 3 15, 14 B24 6, 17 11 STF 331 2, 3 2, 3 15, 14 B24 6, 17 12 32 Eri 13 13 62 B61 28, 29 13 STF 485 3 3 14 B23, 24 6, 5 14 omi2 Eri 14 14 61, 73 B61 28, 29 15 chi Tau 7 7 37 B42, 41 16 16 1 Cam 3 3 14, 25 B23 5 17 55 Eri 14, 13 14, 13 61, 73 B60 28 18 rho Orionis 14 14 61 B60 16, 28 19 beta Ori 14 14 61, 73 B60 28 20 118 Tau 7 7 37 B41 16 21 delta Ori 14 14 61 B60 28, 16 22 STF 747 14 14 61, D7 B60, 59 28 23 lambda Ori 14 14 49 B60, 59 16

24 theta1 Ori 14 14 61, D7 B60, 59 28

25 iota Ori 14 14 61, D7 B60, 59 28 26 STF 742 7 7 49, 37 B41, 40 16 not 27 sigma Ori 14 14 61 B60, 59 28, 16 28 gamma Lep 21 21 73, 85 B79, 78 28, 27 st CDSA Taki Num Object CDSA 1 iDSA TriAtlas "B" no lbl 2nd no lbl no lbl no lbl 29 STF 817 14 not 14 not 61, 49 B59 16 not 30 epsilon Mon 14 14 60 B59 15, 27 31 beta Mon 14 14 60, 72 B59 27 32 12 Lyn 3 3 13 B21 5 33 38 Gem 8, 14 8, 14 48 B40, 39, 58, 59 15 34 h3945 CMa 22 22 84, 72 B77 27 35 19 Lyn 3 3 13 B21 5 36 alpha Gem 8 8 36 B39 15, 14 37 STF 1121 22, 14, 15 22 72 B77 27 not 38 kappa Pup 22 22 84 B77 27 39 2 Pup 22, 14, 15 22, 14, 15 84, 72 B77 27 40 zeta Cnc 8 8 47 B38, 39 14, 15 41 phi2 Cnc 8 8 35 B38 14, 15 42 iota Cnc 8 8 35 B38 14 43 38 Lyn 8 8 23, 35 B20, 38 14 44 zeta1 Ant 22 22 83 B75 26, 25 45 gamma Leo 9, 15, 16 9, 15, 16 46 B37 13, 14 46 54 Leo 9 9 34 B36, 37 13 47 N Hya 23 23 82 B74 25 48 delta Crv 16, 23 16, 23 69 B73 24 49 24 Com 9 9 45 B35 12 50 STF 1659 16, 23 16, 23 69 B54, 73 24 not 51 STF 1664 16, 23 16, 23 69 B54, 73 24 52 STF 1669 16, 23 16, 23 69 B54, 73 24 not 53 gamma Vir 16 16 57 B54 12, 24 54 32 Cam 1 1 1, 4 B5, 3-7 6 55 alpha CVn 9 9 21, 33 B17, 18 12 56 zeta UMa 4 4 11 B17 3 57 3 Cen 23, 24 23, 24 81, 80 B72 24, 23 58 kappa Boo 4 4 20, 11 B16, 17 3, 11 59 iota Boo 4 4 20, 11 B16, 17 3, 11 st CDSA Taki Num Object CDSA 1 iDSA TriAtlas "B" no lbl 2nd no lbl no lbl no lbl 60 STF 1835 10, 17 10, 17 44, 56 B53 11 61 pi Boo 10, 17 10, 17 44 B33 11 62 epsilon Boo 10 10 32 B33 11 63 xi Boo 10, 17 10, 17 44 B33 11 64 delta Boo 10 10 32 B33 11 65 mu1, mu2 Boo 10 10 20, 32 B33 11 66 delta Ser 17, 10 17, 10 44 B52 11 67 zeta CrB 10 10 32, 20 B33, 32 11, 10 68 beta Ser 17, 10 17, 10 44 B32, 33 11, 10 69 xi Sco 24, 17, 18 24, 17, 18 67, 68 B70 22, 23 70 beta Sco 24, 17, 18 24, 17, 18 67, 68 B70 22, 23 71 kappa Her 10, 17, 18 10, 17, 18 43 B32 10, 11 72 nu Sco 24, 17, 18 24, 17, 18 67 B70 22, 23 73 sigma CrB 10 10 31 B32 11, 10 74 16, 17 Dra 5 5 10, 14 B15 16 75 mu Dra 5 5 10 B14, 15 16 76 alpha Her 10, 18 10, 18 43 B31 10 77 delta Her 10 10 31 B31 10 78 36 Oph 24 24 79 B69 22 79 omicron Oph 24 24 79 B69 22 80 rho Her 10 10 31, 19 B31, 14, 15 10 81 nu Dra 5 5 10 B14, 15 16 82 psi Dra 5 5 3 B3, 4 2, 1-4, 6 83 PZ4 (h5003) 25 25 78, 79 B69 22, 21 84 40, 41 Dra 1 1 3 B3, 1-4 2, 1-6 85 95 Her 10, 11 10, 11 31, 30, 42, 43 B31 10, 9 86 70 Oph 18 18 54 B50 10, 9, 21, 22 87 100 Her 10, 11 10, 11 31, 30 B31 10, 9 88 epsilon1 Lyr 11 11 18 B30, 13, 14 9 89 epsilon2 Lyr 11 11 18 B30, 13, 14 9 90 zeta Lyr 11 11 30, 18 B30, 13, 14 9 91 beta Lyr 11 11 30 B30 9 st CDSA Taki Num Object CDSA 1 iDSA TriAtlas "B" no lbl 2nd no lbl no lbl no lbl 92 SHJ 282 11 11 30 B30 9 93 theta Ser 18 18 54 B49 9, 21 94 STF 2470 11 11 30 B30 9 not 95 STF 2474 11 11 30 B30 9 96 beta Cyg 11 11 30 B29, 30 9 97 16 Cyg 5, 11 5, 11 18 B13 8, 2 98 57 Aql 19, 18 19, 18 54, 66 B48 21, 20 99 h1470 11, 2 11, 2 13, 17 B29 8 not 100 kappa Cep 1 1 2 B2, 1 1, 1-6 101 gamma Del 19, 11 19, 11 41 B29, 28 8 102 61 Cyg 11 11 17, 29 B12, 28 9 103 beta Cep 2, 1 2, 1 2 B2 1, 1-6 104 STF 2816 2 2 8 B11, 12 1 105 STF 2819 2 2 8 B11, 12 1 not 106 epsilon Peg 11, 19 11, 19 53 B47 8, 7 107 xi Cep 2 2 8 B2, 12 1 108 delta Cep 2 2 8 B11 1 109 8 Lac 2, 6 2, 6 16 B11, 27 7, 8 110 sigma Cas 2 2 15, 8 B10 6, 7, 18 References: commercial Astronomy magazine, March 2016, article by Glenn Chaple (listing obtained separately) PSA commercial Sky & Telescope's "Pocket Sky Atlas" by R.W. Sinnott, 2006 st CDST 1 commercial "The Cambridge Atlas" by J. Mullaney & W.Tirion, 1st edition, 2009 (now out of print) nd CDST 2 commercial "The Cambridge Double Star Atlas" by B. MacEvoy & W.Tirion, 2nd edition, 2015 iDSA commercial "interstellarum Deep Sky Atlas" by R. Stoyan & S. Schurig, 2014 TriAtlas "B" "free" "Tri-Atlas" by J.R. Tores Lapasio, "B" size, 2nd edition, April 2008 available at ==> www.uv.es/jrtorres/triatlas.html Taki "free" "Atlas of Double " by T. Taki & P. Wehner, September 2007 available at ==> www.geocities.jp/toshimi_taki/atlas_dbl_star/dbl_star_atlas.htm commercial "Sky Tools 3" software by G. Crinklaw (for HR and HD star numbers, and object confirmations)

Comments: No commonly available paper atlas identifies 100% of the double stars on this list. Preparation is KEY to completing this marathon, which only allows ~5 minutes per object over ~9 observing hours. The PSA may be the best field tool for performing the marathon, after first using the other references to annotate the PSA. BOLD ITALIC chart numbers with a left alignment/justification are those where objects are plotted but not labeled. BOLD chart numbers with a "not" after them indicate objects which are not included in the atlas. The "Notes" column provides other identification for the object; some charts use this nomenclature. If the object appears on several charts, the first one listed offers a "best" chart view.

Minor edits to the original listing (for better spacing) and chart cross-references added by Jim K (28 March 2017)