Общие вопросы астрономии > Новости наблюдательной астрономии
У Плутона открыто 2 новых спутника!!!
kor01:
В декабрьском номере Ская небольшая фотография и мизерная заметка по этому поводу.
ctac:
Совершенно не понятно, как эту инфу не подняли, коль она уже была так давно! :o
А вот и оригинальный текст Циркуляра IUA №8625:
"
S/2005 P 1 AND S/2005 P 2
H. A. Weaver, Applied Physics Laboratory, Johns Hopkins
University; and S. A. Stern, Southwest Research Institute (SwRI) --
on behalf of a team including M. J. Mutchler (Space Telescope
Science Institute), A. J. Steffl (SwRI), M. W. Buie (Lowell
Observatory), and W. J. Merline, J. R. Spencer, E. F. Young, and
L. A. Young (SwRI) -- report the discovery of two new satellites of
Pluto. The objects, provisionally designated S/2005 P 1 and S/2005
P 2, were clearly detected (S/N > 35) in two different Hubble Space
Telescope ACS/WFC images on May 15.05 and 18.14 UT. On May 15,
S/2005 P 1 was 1".85 (1.85 arcsec) from the center of Pluto in p.a.
264.2 deg, and S/2005 P 2 was 2".09 from Pluto in p.a. 326.9 deg.
On May 18, the locations were 2".36 in p.a. 305.8 deg and 2".22 in
p.a. 355.5 deg. The two objects have roughly comparable brightness,
with V = 22.96 +/- 0.15 for S/2005 P 1 and V = 23.41 +/- 0.15 for
S/2005 P 2. Unique orbits cannot be calculated from the available
data, but the measured positions are consistent with nearly
circular orbits in the orbital plane of Pluto I (Charon). On this
assumption, preliminary orbital solutions yield a = 64700 +/- 850
km and P = 38.2 +/- 0.8 days for S/2005 P 1, and a = 49400 +/- 600
km and P = 25.5 +/- 0.5 days for S/2005 P 2. Examination of
archival HST ACS/HRC data taken on 2002 June 14 (PI: M. W. Buie)
shows two objects near the locations predicted by these orbits,
providing independent support for the satellite detections. A
search over the entire orbital stability zone (+/- 100" around
Pluto) does not show any other potential satellites to a limiting
magnitude of V about 27.1 (5-sigma). For additional information,
see http://www.boulder.swri.edu/plutonews.
"
ctac:
22 February 2006
IAU Circular No.8676
S/2005 P 1 AND S/2005 P 2
--------------------------------------------------------------------------------
M. J. Mutchler, Space Telescope Science Institute; A. J.
Steffl, Southwest Research Institute (SwRI); H. A. Weaver, Applied
Physics Laboratory, Johns Hopkins University; S. A. Stern, SwRI; M.
W. Buie, Lowell Observatory; and W. J. Merline, J. R. Spencer, E.
F. Young, and L. A. Young, SwRI, confirm the presence of the two
new satellites of Pluto in Hubble Space Telescope ACS/HRC images
taken on Feb. 15.6 UT using the same broadband V filter (F606W)
employed during the discovery observations in May 2005 (cf. IAUC
8625). Preliminary analyses show that S/2005 P 1 was 2".86 from
the center of Pluto in p.a. 343 deg and that S/2005 P 2 was 2".03
from Pluto in p.a. 356 deg; measured V magnitudes are 23.26 +/-
0.15 for S/2005 P 1 and 23.7 +/- 0.2 for S/2005 P 2. No additional
new satellites were detected. For more information, see
http://hubblesite.org/news/2006/09.
ctac:
--------------------------------------------------------------------------------
S/2005 P 1 AND S/2005 P 2
--------------------------------------------------------------------------------
S. A. Stern, Southwest Research Institute (SwRI); H. A.
Weaver, Applied Physics Laboratory, Johns Hopkins University; M. J.
Mutchler, Space Telescope Science Institute; A. J. Steffl, W. J.
Merline, and J. R. Spencer, SwRI; M. W. Buie, Lowell Observatory;
and E. F. Young and L. A. Young, SwRI, report color observations of
the newly discovered small satellites of Pluto (cf. IAUC 8625, 8676)
using the Hubble Space Telescope (+ ACS/HRC) on Mar. 2.75 UT.
During these observations, S/2005 P 1 was at an average position of
2".69 from the photo-center of Pluto at p.a. 138 deg, and S/2005 P
2 was 1".43 away at p.a. 214 deg. Using ACS filters F606W and
F435W, and adopting for Pluto I (Charon) the value B-V = +0.710
(Buie et al. 1997, Icarus 125, 233), B-V colors +0.653 +/- 0.026
and +0.654 +/- 0.065 were found for S/2005 P 1 and S/2005 P 2,
respectively. These colors indicate that the observed hemispheres
of all three of Pluto's satellites are essentially neutral, with
only minor differences among them, as might be expected for bodies
having a similar origin and sharing a similar environment. Given
that a much redder color of B-V = +0.91 +/- 0.15 was reported for
S/2005 P 2 (Buie et al. 2006,
http://xxx.lanl.gov/abs/astro-ph/?0512491), additional
observations are solicited.
2006 March 9 (8686)
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