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In 1968 (10 November), Lovelace discovered period <math>P\approx 33</math> ms of the [[Crab Pulsar]].<ref name=”Lovelace1968”>[https://ui.adsabs.harvard.edu/abs/1968IAUC.2113....1L/abstract “Pulsar NP 0532 Near Crab Nebula”] R. V. E. Lovelace, J. M. Sutton, and H. D. Craft 1968, November, IAU Circ., No. 2113, #1 (1968) </ref><ref name="Lovell1973">[https://ui.adsabs.harvard.edu/abs/1973ozjb.book.....L/abstract "Out of the Zenith. Jodrell Bank 1957-1970"] Sir. Bernard Lovell, 1973, London: Oxford University Press, pp 1-255 (see page159).</ref> As a graduate student working at [[Arecibo Observatory]], Lovelace developed a version of the [[Fast Fourier transform]] program <ref name="Lovelace1969">[https://ui.adsabs.harvard.edu/abs/1969Natur.222..231L/abstract "Digital Search Methods for Pulsars"] 1969, R. V. E. Lovelace, J. M. Sutton, E. E. Salpeter, ''Nature'' 222 (5190), 231-233.</ref> which
 
In 1968 (10 November), Lovelace discovered period <math>P\approx 33</math> ms of the [[Crab Pulsar]].<ref name=”Lovelace1968”>[https://ui.adsabs.harvard.edu/abs/1968IAUC.2113....1L/abstract “Pulsar NP 0532 Near Crab Nebula”] R. V. E. Lovelace, J. M. Sutton, and H. D. Craft 1968, November, IAU Circ., No. 2113, #1 (1968) </ref><ref name="Lovell1973">[https://ui.adsabs.harvard.edu/abs/1973ozjb.book.....L/abstract "Out of the Zenith. Jodrell Bank 1957-1970"] Sir. Bernard Lovell, 1973, London: Oxford University Press, pp 1-255 (see page159).</ref> As a graduate student working at [[Arecibo Observatory]], Lovelace developed a version of the [[Fast Fourier transform]] program <ref name="Lovelace1969">[https://ui.adsabs.harvard.edu/abs/1969Natur.222..231L/abstract "Digital Search Methods for Pulsars"] 1969, R. V. E. Lovelace, J. M. Sutton, E. E. Salpeter, ''Nature'' 222 (5190), 231-233.</ref> which
 
was adapted to run on the Arecibo Observatory's [[CDC 3000 series|CDC 3200]] computer
  
was adapted to run on the Arecibo Observatory's [[CDC 3000 series|CDC 3200]] computer
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<ref name=”LovelaceTaylor2012”>[http://articles.adsabs.harvard.edu/pdf/2012Obs...132..186L "On the Discovery of the Period of the Crab Nebula Pulsar"] R.V.E. Lovelace & G. Leonard Tyler, 2012, The Observatory, V. 132, p. 186-188</ref>. This program helped to separate the periodic pulsar signal from the noise, and one night he discovered the period of the [[Crab pulsar]], with a high precision, 33.09 ms, and the position of the pulsar on the sky with precision of 10'.<ref name = "Comella1969">[https://ui.adsabs.harvard.edu/abs/1969Natur.221..453C/abstract "Crab nebula pulsar NP 0532"] 1969, J. M. Comella, H. D. Craft, R. V. E. Lovelace, J. M. Sutton, G. L. Tyler, ''Nature'' 221 (5179), 453-454.</ref><ref name=”Lang2013”>[https://books.google.com/books?id=Nq_1CAAAQBAJ&newbks=1&newbks_redir=0&printsec=frontcover&pg=PA1&hl=en#v=onepage&q&f=false "Astrophysical Formulae. Space, Time, Matter and Cosmology"] Kenneth R. Lang 2014, Publisher: Springer Berlin Heidelberg</ref>
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<ref name=”LovelaceTaylor2012”>[http://articles.adsabs.harvard.edu/pdf/2012Obs...132..186L "On the Discovery of the Period of the Crab Nebula Pulsar"] R.V.E. Lovelace & G. Leonard Tyler, 2012, The Observatory, V. 132, p. 186-188</ref>. This program helped to separate the periodic pulsar signal from the noise, and one night he discovered the period of the [[Crab pulsar]], and estimated it with a high precision, 33.09 ms, and also the position of the pulsar on the sky with precision of 10'.<ref name = "Comella1969">[https://ui.adsabs.harvard.edu/abs/1969Natur.221..453C/abstract "Crab nebula pulsar NP 0532"] 1969, J. M. Comella, H. D. Craft, R. V. E. Lovelace, J. M. Sutton, G. L. Tyler, ''Nature'' 221 (5179), 453-454.</ref><ref name=”Lang2013”>[https://books.google.com/books?id=Nq_1CAAAQBAJ&newbks=1&newbks_redir=0&printsec=frontcover&pg=PA1&hl=en#v=onepage&q&f=false "Astrophysical Formulae. Space, Time, Matter and Cosmology"] Kenneth R. Lang 2014, Publisher: Springer Berlin Heidelberg</ref> A month earlier, observers from Jordell Bank observatory reported about possible presence of two pulsars in Crab Nebula, with a possible period of 1 second <ref name=>. Lovelace and collaborators found that only one pulsar is present (the NP ...Crab Pulsar), found its precise position with accuracy of 10' and period
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of 33.09 ms, which was the shortest-period pulsar for that time.
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<ref name = "Comella1969"/>
  
<ref name = "Comella1969"/>

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In 1968 (10 November), Lovelace discovered period \(P\approx 33\) ms of the Crab Pulsar.[1][2] As a graduate student working at Arecibo Observatory, Lovelace developed a version of the Fast Fourier transform program [3] which was adapted to run on the Arecibo Observatory's CDC 3200 computer [4]. This program helped to separate the periodic pulsar signal from the noise, and one night he discovered the period of the Crab pulsar, and estimated it with a high precision, 33.09 ms, and also the position of the pulsar on the sky with precision of 10'.[5][6] A month earlier, observers from Jordell Bank observatory reported about possible presence of two pulsars in Crab Nebula, with a possible period of 1 second <ref name=>. Lovelace and collaborators found that only one pulsar is present (the NP ...Crab Pulsar), found its precise position with accuracy of 10' and period of 33.09 ms, which was the shortest-period pulsar for that time.

[5]

References

  1. ↑ “Pulsar NP 0532 Near Crab Nebula” R. V. E. Lovelace, J. M. Sutton, and H. D. Craft 1968, November, IAU Circ., No. 2113, #1 (1968)
  2. ↑ "Out of the Zenith. Jodrell Bank 1957-1970" Sir. Bernard Lovell, 1973, London: Oxford University Press, pp 1-255 (see page159).
  3. ↑ "Digital Search Methods for Pulsars" 1969, R. V. E. Lovelace, J. M. Sutton, E. E. Salpeter, Nature 222 (5190), 231-233.
  4. ↑ "On the Discovery of the Period of the Crab Nebula Pulsar" R.V.E. Lovelace & G. Leonard Tyler, 2012, The Observatory, V. 132, p. 186-188
  5. ↑ 5.0 5.1 "Crab nebula pulsar NP 0532" 1969, J. M. Comella, H. D. Craft, R. V. E. Lovelace, J. M. Sutton, G. L. Tyler, Nature 221 (5179), 453-454.
  6. ↑ "Astrophysical Formulae. Space, Time, Matter and Cosmology" Kenneth R. Lang 2014, Publisher: Springer Berlin Heidelberg
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