README web version of /home/usg/OPS/MTS/readme_xml/readme_83502401

Principal Investigator Email Address

• Damien.Segransan@unige.ch

Estimated Total Execution Time (hours, including overheads)

• 5.5

General Description

• These observations are radial velocity measurements of VB-10 (Gl752B,
   M8 dwarf, R=15.6, H=9.23).
  
  The star is very nearby (d=6.1pc, par=164.3mas) and has a high proper motion (~1.47
   arcsec/yr). 
  It could be hard to find the star due to its relative faintness and large parallactic
   motion.
  
  Since VB10 (Gl752B) is gravitalionally bound to the much brighter star Gl752A (M2
   dwarf, R=8.3, H=4.93), 
  it could be useful to identify Gl752A first and then search for VB10 which is located
   at about 74 arcsec south of Gl752A. 
  
  As requested, the precessed coordinates for august 02, 2009 (corrected from proper
   motion only) are : 
    - VB10 a  : RA(J2009.549) 19 16 57.25  DEC(J2009.549)  +05 08 48.6
    - Gl752A  : RA(J2009.549) 19 16 54.9   DEC(J2009.549)  +05 09 55.4
  
  A SNR of 100 at lbd=1592.700nm  (detector 3) is required to reach a good RV accuracy
   on this target.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• No special conditions

Time-Critical Aspects

• The execution of the remaining 3 VB-10 OBs should be uniformally spread
   over the coming month (until the end of P83). If possible, the last OB should be
   executed the last week of September. This correspond to the execution of one OB
   every 10 days. The flexibility around this 10-day-period is +-3 days

Special Execution Requirements

• The VB-10 OB must be followed by a calibration OB (cal-OB-HD171157_H)
  otherwise the Radial velocity VB-10 cannot be derived.
  The support astronomer (or the TiO) should pay special attention on the centering
   of the target on the slit to avoid radial velocity biases induced by bad centering.

Special Calibration Information

• The VB-10 OB must be followed by a calibration OB (cal-OB-HD171157_H)
  otherwise the Radial velocity VB-10 cannot be derived.
  The support astronomer (or the TiO) should pay special attention on the centering
   of the target on the slit to avoid radial velocity biases induced by bad centering.

ToO Information

• N/A

ToO Activators List

• N/A

Do the README file and the instrument comments of the telluric stars
 OBs include the required S/N/pixel of the spectrum of the telluric star, its spectral
 type and allowed spectral range?

• YES

Do any OBs include wavelength or flatfield calibrations?

• N/A

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If the slit viewer guide star is different from the target, are the RA
 and DEC offsets accurate to within 0.05 arcsec and do they take into account the
 relative proper motion between the two objects?

• N/A

If you have preferences which OBs should be executed first for objects
 at similar RA, did you make use of the User Priority field in the OBs?

• N/A