- Guinan and Sion (1984): T=35,000 ± 3000, log g ~ 8
- Cully et al. (1996): T=33,100 ± 500, log g = 8.5 (assumed)
- Dupuis et al. (1997): T=32,000
- Barstow et al. (1997): T=32,400 (+270,-800), log g = 8.16 (+.18,-0.24)
- Werner & Rauch (1997): T=35,125 ± 1275, log g = 8.21 ± 0.23
O'Brien, Bond, and Sion (2001): T=34,500 ± 1000, log g = 8.3 ± 0.3
- 9.25 minute rotation period
- The dominant soft X-ray source
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