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2012年3月最亮柯伊伯带天体掩星事件摘要

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发表于 2012-3-2 15:49 | 显示全部楼层 |阅读模式
本帖最后由 q零度星系 于 2012-3-2 17:43 编辑

                                     2012年3月最亮柯伊伯带天体掩星事件摘要
1.2002TX300掩星
2.亡神星掩星
2012-03-21
3.创神星掩星:
2012-03-012012-03-02
2012-03-032012-03-132012-03-13
2012-03-142012-03-162012-03-30

4.妊神星掩星
2012-03-11
5.伐楼拿Varuna 掩星
2012-03-312012-03-31
6.伊克西翁Ixion掩星
2012-03-032012-03-102012-03-19
2012-03-222012-03-262012-03-27
2012-03-282012-03-302012-03-30

7.2003AZ84掩星
2012-03-03
Notes:
C/A: geocentric closest approach, in arcsec
P/A: Planet position angle wrt to star at C/A, in deg
vel: velocity in plane of sky, in km/sec, positive= prograde, negative= retrograde
R: instrumental magnitude in UCAC2 system
J, H, K: 2MASS magnitudes (50.0 = not in 2MASS)
R*, J*, H*, K* are normalized magnitudes to a common
shadown velocity of 20 km/sec by the relationship:
Mag* = Mag_actual + 2.5*log10[velocity/20 (km/sec)]
Delta: Planet range to Earth, AU
long: East longitude of sub-planet point, deg, positive towards East
loc. t.= UT + long: local solar time at sub-planet point, hh:mm
--------------------------------------------------------------------------------------------------------------------
Selection criteria:
Maximum geocentrique closest approach considered:  0.33500000000000002       arcsec
Day light exclusion (range loc. t.): 12.0hs to 12.0 hs (t1 = t2 -> no exclusions)
List below has:            2  entries
Reference ephemeris: DE418/JPL_14                                      
Offset applied to ephemeris off_ra(mas) = A * (t-t0) + B
Offset applied to ephemeris off_de(mas) = C * (t-t0) + D
t0 =    2005.0000000000000       yrs
A =    0.0000000000000000       (mas/yr)
B =   -84.000000000000000       (mas)
C =    0.0000000000000000       (mas/yr)
D =   -53.000000000000000       (mas)
pm = proper motion applied? (ok, no)
ct = uc (UCAC2); 2m (2MASS); fs (field star)
f = multiplicity flag
0 - no multiple entries per star in astrometry
1 - single position from 2 or more uc/2m entries
2 - single position from 1 uc/2m entry only
3 - fs position from entry with more N contributions
4 - fs position from entry with best (x,y) error
5 - fs position from entry with brightest R mag.
6 - fs position from average over all entries
(see details in Assafin et al. 2009)
E_ra, E_de: error of star position (mas); (9999 = no estimation)
pmra, pmde: star proper motion (mas); (9999 = no proper motion)


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