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PSR J1748−2446ad
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From Wikipedia, the free encyclopedia
Pulsar in the constellation Sagittarius
PSR J1748−2446ad
The location of PSR J1748-2446ad in the night sky. The pulsar is located in the center of the yellow square. It is too faint in this image to be visible against the background.<br>Credit : GALEX GR6/7 Data Release
Observation data<br>Epoch J2000 Equinox J2000
Constellation
Sagittarius
Right ascension
17h 48m 04.9s
Declination
−24° 46′ 04″
Characteristics
Spectral type
Pulsar
AstrometryDistance 18,000[1] ly<br>(5,500 pc)<br>Details[2]Mass M☉Radius kmRotation 1.39595482(6) ms<br>716.35556(3) HzAge ≥2.5×107 years<br>Database referencesSIMBAD data
PSR J1748−2446ad is the fastest-spinning pulsar known, at 716.35 Hz (times per second),[2] or 42,981 revolutions per minute (1.3959 milliseconds). This pulsar was discovered by Jason W. T. Hessels of McGill University on November 10, 2004, and confirmed on January 8, 2005.
If the neutron star is assumed to contain less than two times the mass of the Sun, within the typical range of neutron stars, its radius is constrained to be less than 16 km. At its equator it is spinning at approximately 24% of the speed of light, or over 70,000 km per second.
The pulsar is located in a globular cluster of stars called Terzan 5, located approximately 18,000 light-years from Earth in the constellation Sagittarius. It is part of a binary system and undergoes regular eclipses with an eclipse magnitude of about 40%. Its orbit is highly circular, with a 26-hour period. The other object in the system is at least 0.14 solar masses, with a radius of 5–6 solar radii. Hessels and collaborators state that the companion may be a "bloated main-sequence star, possibly still filling its Roche Lobe". Hessels and collaborators go on to speculate that gravitational radiation from the pulsar might be detectable by LIGO.[2]
See also<br>[edit]
PSR J0901–4046 longest period pulsar known
PSR J0952–0607 second-fastest-spinning pulsar known
NGC 6624, a globular cluster containing a neutron star spinning at possibly the same velocity.
References<br>[edit]
^ Ortolani, S.; Barbuy, B.; Bica, E.; Zoccali, M.; Renzini, A. (2007). "Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry". Astronomy and Astrophysics. 470 (3): 1043–1049. arXiv:0705.4030. Bibcode:2007A&A...470.1043O. doi:10.1051/0004-6361:20066628. S2CID 18360940.
^ a b c Hessels, J. W. T.; Ransom, S. M.; Stairs, I. H.; Freire, P. C.; Kaspi, V. M.; Camilo, F. (2006). "A Radio Pulsar Spinning at 716 Hz". Science. 311 (5769): 1901–1904. arXiv:astro-ph/0601337. Bibcode:2006Sci...311.1901H. doi:10.1126/science.1123430. PMID 16410486. S2CID 14945340.
External links<br>[edit]
XTE J1739−285, Integral points to the fastest spinning neutron star[permanent dead link]
Evolution of millisecond pulsars
Constellation of Sagittarius
List of stars in Sagittarius
Galactic Center
Central Molecular Zone
Large Sagittarius Star Cloud
Sagittarius A*
Sagittarius in Chinese astronomy
Wow! signal
Stars<br>Bayer<br>α (Rukbat)
β1 (Arkab Prior)
β2 (Arkab Posterior)
γ1 (W)
γ2 (Alnasl)
δ (Kaus Media)
ε (Kaus Australis)
ζ (Ascella)
θ1
θ2
κ1
κ2
λ (Kaus Borealis)
μ (Polis)
ν1 (Ainalrami)
ν2
ξ1
ξ2
π (Albaldah)
ρ1
ρ2
σ (Nunki)
χ1
χ2
χ3
ω (Terebellum)
Flamsteed
11
14
15
16
17
18
21
43 (d)
52 (h2)
56 (f)
59 (b)
60 (A)
62 (c)
63 Oph
Variable
RS
RY
VX
KW
V348
V356
V630
V725
V1017
V1059
V3961
V4024
V4029
V4030
V4046
V4199
V4200
V4332
V4334
V4375
V4381
V4580
V4641
V4647 (Pistol Star)
V4650
V4743
V4998
V5125
V5157
V5652 (Gumala)
V5668
V5856
HR<br>6748
6762
6766
6836
6842
6907
6998
7029
7355
7380
7631
7652
7659
7703
HD<br>163296
164270
164604 (Pincoya)
166191
169142
170657
171238
177765
180902
181342 (Belel)
181720 (Sika)
187085
190647
316285
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2MASS J19281982−2640123
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Bursting Pulsar
CEN 16
CWISEP J1935−1546
D9
GCIRS 7
GCIRS 8*
GCIRS 13E
GCIRS 16SW
Gomez's Hamburger
G0.238−0.071
HATS-36
IRAS 17423−1755
IRAS 18162−2048
K2-2016-BLG-0005L
KMT-2020-BLG-0414L
KMT-2024-BLG-0404L
LBV 1806−20
MACHO 176.18833.411
MACHO-96-BLG-5
MACHO-1997-BLG-41
MACHO-98-BLG-35
MOA-2007-BLG-192L
MOA-2007-BLG-400L
MOA-2009-BLG-387L
MOA-2010-BLG-477L
MOA-2011-BLG-262L
NGC 300 X-1
NGC 6822-WR 12
OGLE-2003-BLG-235L
OGLE-2005-BLG-169L
OGLE-2011-BLG-0462
OGLE-2016-BLG-0007L
PSR J1747−2958
PSR J1748−2021B
PSR J1748−2446ad
PSR J1930−1852
Ross 154
S2
S55
S62
SAX J1808.4−3658
SGR J1745−2900
SGR 1806−20
SWEEPS J175853.92−291120.6
SWIFT...