SAX J1808.4-3658

A transient X-ray source first discovered in 1996 by the Italian-Dutch BeppoSAX satellite, SAX J1808.4-3658 revealed X-ray pulsations at the 401 Hz neutron star spin frequency when it was observed during a subsequent outburst in 1998 by NASA's RXTE satellite. The neutron star is orbited by a brown dwarf binary companion with a likely mass of 0.05 solar masses, every 2.01 hours. X-ray burst oscillations and quasi-periodic oscillations in addition to coherent X-ray pulsations have been seen from SAX J1808.4-3658, making it a Rosetta stone for interpretation of the timing behavior of low-mass X-ray binaries.

These accreting millisecond X-ray pulsars are thought to be the evolutionary progenitors of recycled radio millisecond pulsars. A total of thirteen accreting millisecond X-ray pulsars have been discovered as of January 2011. Three of them are Intermittent millisecond X-ray pulsars (HETE J1900.1-2455, Aql X-1 and SAX J1748.9-2021), i.e. they emit pulsations sporadically during the outburst.

Stars of Sagittarius

Bayer	α (Rukbat) β¹ (Arkab Prior) β² (Arkab Posterior) γ² (Alnasl) δ (Kaus Media) ε (Kaus Australis) ζ (Ascella) η θ¹ θ² ι κ¹ κ² λ (Kaus Borealis) μ (Polis) ν¹ (Ain al Rami) ν² ξ¹ ξ² ο π (Albaldah) ρ¹ ρ² σ (Nunki) τ υ φ (Nanto) χ¹ χ² χ³ ψ ω

Flamsteed	1 4 5 6 7 9 12 14 15 16 17 18 21 23 24 25 26 28 29 30 31 33 43 50 51 52 53 54 55 56 57 59 60 61 62 63 65 63 Oph

Variable	T U W (γ¹) X (3) Y RR RS RY RZ VX VY VZ WZ XX XZ YY YZ AQ AS AV BB FN GM GU KW MV V348 V350 V356 V440 V505 V523 V526 V617 V630 V725 V732 V919 V1017 V1216 V1223 V1647 V1942 V3792 V3795 V3804 V3879 V3885 V3890 V3892 V3894 V3903 (11) V3961 V3984 V4021 V4024 V4028 V4029 V4030 V4046 V4050 V4064 V4072 V4089 V4091 V4138 V4140 V4160 V4169 V4190 V4198 V4199 V4200 V4332 V4333 V4371 V4375 V4381 V4387 V4405 V4407 V4434 V4444 V4633 V4641 V4728 V4743 V4745 V4998 V5112 V5115 V5116 V5558 V5652

HR	6617 6679 6680 6691 6692 6693 6704 6716 6739 6748 6762 6766 6769 6777 6780 6788 6798 6835 6836 6838 6842 6864 6874 6889 6907 6909 6914 6919 6933 6936 6944 6960 6972 6988 6990 6998 7026 7029 7035 7038 7072 7104 7126 7128 7151 7159 7164 7166 7168 7182 7186 7195 7203 7205 7211 7230 7239 7240 7246 7265 7276 7277 7282 7316 7317 7327 7330 7334 7350 7355 7360 7367 7378 7380 7392 7398 7410 7433 7443 7454 7473 7491 7496 7507 7532 7538 7585 7616 7627 7629 7630 7631 7639 7643 7652 7658 7659 7703 7706 7725 7765 7799 7801 7808

HD	163296 163758 164604 164816 165052 169142 170657 171238 175390 175754 180902 181342 181720 183577 187085 187150 190647 313846 316285

Gliese	745

Other	A1742-294 Ap 1-11 AS 295 BD -18 5550 Bursting Pulsar GGD 27 Great Annihilator GRO J1744-28 GRS 1758-258 GS 1826-24 GX 3-1 GX 5-1 GX 9-1 GX 13+1 Herschel 36 HETE J1900.1-2455 IRAS 17423-1755 IRAS 18162−2048 IRS 3 IRS 7 IRS 8* IRS 13 IRS 16SW LBV 1806-20 LS IV -12 111 MACHO-1997-BLG-41 MACHO-98-BLG-35 2MASS J19513587-3510375 MOA-2007-BLG-192L MOA-2007-BLG-400L MOA-2009-BLG-387L MOA-2010-BLG-477L Nova Sagittarii 1898 Nova Sagittarii 1982 OGLE-2003-BLG-235/MOA-2003-BLG-53 OGLE-2005-BLG-169L OGLE-TR-10 OGLE-TR-56 Pistol Star PSR B1744-24A PSR B1749-28 PSR B1757-24 PSR B1758-23 PSR B1800-21 PSR B1821-24 PSR B1857-26 PSR J1747-2958 PSR J1748-2446ad Ross 154 S0-102 S2 Sakurai's Object SAX J1747.0-2853 SAX J1808.4-3658 SAX J1810.8-2609 SGR 1806-20 SWEEPS J175853.92−291120.6 SWEEPS J175902.00-291323.7 SWEEPS J175902.67−291153.5 Swift J1745-26 SWIFT J1756.9-2508 Th 4-4 4U 1755-33 4U 1820-30 W33A WASP-67 WR 102 WR 102ea WR 102ka WR 104 WR 110 WR 111 WR 112 XTE J1748-288 XTE J1807-294 XTE J1810-197 XTE J1814-338

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