VLTI GRAVITY
VLTI Gravity Mode
Version P115
Description
FAQ
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VLTI GRAVITY ETC
Mode:
Single Field
Dual Field
Beam Combiner settings:
Scientific beam combiner spectral resolution:
Low 22
Medium 500
High 4000
Polarization splitting
Wavefront Sensor Type:
Visible (V-band)
Infrared (H-band)
Fringe Tracking settings:
Fringe tracking frequency:
Slow 100
Medium 300
Fast 1000
Hz
Fringe tracking feasibility margin:
Science Object Properties
Target Spectrum:
Template Spectrum:
Spectral Type:
O9V (Pickles) (35900 K)
B0V (Pickles) (31500 K)
B3V (Pickles) (19000 K)
A0V (Pickles) (9480 K)
A2V (Pickles) ( 8810 K)
A5V (Pickles) ( 8160 K)
F0V (Pickles) ( 7020 K)
F2V (Pickles) ( 6750 K)
F5V (Pickles) ( 6530 K)
G0V (Pickles) ( 5930 K)
G2V (Pickles) ( 5830 K)
G5V (Pickles) ( 5560 K)
K0V (Pickles) ( 5240 K)
K2V (Pickles) ( 5010 K)
K4V (Pickles) ( 4560 K)
K5V (Pickles) ( 4340 K)
K7V (Pickles) ( 4040 K)
M0V (Pickles) ( 3800 K)
M2V (Pickles) ( 3530 K)
M3V (Pickles) ( 3380 K)
M4V (Pickles) ( 3180 K)
M5V (Pickles) ( 3030 K)
M6V (Pickles) ( 2850 K)
Target Magnitude and Mag.System:
K
=
Vega
AB
Blackbody:
Temperature:
K
Upload Spectrum:
Select
Supported formats: two-column ASCII, with wavelength unit
nm
and a flux unit proportional to
erg/cm
2
/s/A
Single Line:
Lambda:
nm
Flux:
10
-16
ergs/s/cm
2
FWHM:
nm
Target geometry:
Uniform Disc:
Diameter:
mas
Gaussian:
FWHM:
mas
Elliptical Gaussian:
Major axis:
mas
Minor axis:
mas
Position Angle:
deg
(*)
Binary:
Diameter, Primary:
mas
Diameter, Secondary:
mas
Separation:
mas
Position Angle:
deg
(*)
Flux Fraction, Primary:
(**)
Flux Fraction, Secondary:
(**)
(*) angles counted from North to East
(**) Flux Fraction, Primary + Flux Fraction, Secondary = 1
Time constraints:
Start hour angle:
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
hour
Duration:
1
2
3
4
5
6
7
8
9
10
11
12
hours
Step:
30
15
6
1
minutes
Fringe Tracking Object Properties
Spectrum:
Template Spectrum:
Spectral Type:
O9V (Pickles) (35900 K)
B0V (Pickles) (31500 K)
B3V (Pickles) (19000 K)
A0V (Pickles) (9480 K)
A2V (Pickles) ( 8810 K)
A5V (Pickles) ( 8160 K)
F0V (Pickles) ( 7020 K)
F2V (Pickles) ( 6750 K)
F5V (Pickles) ( 6530 K)
G0V (Pickles) ( 5930 K)
G2V (Pickles) ( 5830 K)
G5V (Pickles) ( 5560 K)
K0V (Pickles) ( 5240 K)
K2V (Pickles) ( 5010 K)
K4V (Pickles) ( 4560 K)
K5V (Pickles) ( 4340 K)
K7V (Pickles) ( 4040 K)
M0V (Pickles) ( 3800 K)
M2V (Pickles) ( 3530 K)
M3V (Pickles) ( 3380 K)
M4V (Pickles) ( 3180 K)
M5V (Pickles) ( 3030 K)
M6V (Pickles) ( 2850 K)
FT Object Magnitude and Mag.System:
K
=
Vega
AB
Blackbody:
Temperature:
K
Upload Spectrum:
Select
Supported formats: two-column ASCII, with wavelength unit
nm
and a flux unit proportional to
erg/cm
2
/s/A
Geometry:
Uniform disk angular diameter:
mas
Distance from the science target:
arcsec
Adaptive Optics Guide Star
The Strehl ratio set to a constant corresponding to the values below until COM1!
On-axis tracking
(AO guide star is the same as FT object)
AO guide star/FT object separation:
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
arcsec
AO guide star magnitude:
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.5
in K-band
Sky Conditions
Moon FLI:
Airmass:
Almanac
Almanac
Time
UT
Time step forward/back
sec
min
hour
day
week
month
year
MJD
Target
Target coordinates
Name or ID:
α
°
δ
°
toggle units
UT rise
culm.
set
Hour Angle
azimuth
altitude
zenith distance
airmass
FLI
moon/sun
phase angle
moon/target
separation
Target
Moon
Sun
An
advanced almanac
is available in the ESO SkyCalc sky model calculator
PWV:
0.10
0.25
0.50
1.0
1.5
2.5
3.5
5.0
7.5
10.0
20.0
30.0
mm
Probability
%
of realising the PWV ≤
10.00
mm
Seeing/Image Quality:
The seeing and image quality are irrelevant for extended sources
Turbulence Category:
10% (seeing ≤ 0.6" & tau0 ≥ 5.2ms)
20% (seeing ≤ 0.7" & tau0 ≥ 4.4ms)
30% (seeing ≤ 0.8" & tau0 ≥ 4.1ms)
50% (seeing ≤ 1.0" & tau0 ≥ 3.2ms)
70% (seeing ≤ 1.15 & tau0 ≥ 2.2ms)
85% (seeing ≤ 1.4" & tau0 ≥ 1.6ms)
Declination:
deg
Baseline Configuration
Quadruplets:
Small (A0-B2-D0-C1)
Medium (D0-G2-J3-K0)
Large (A0-G1-J2-K0)
Extended (A0-B5-J2-J6)
UT-Array (UT1-UT2-UT3-UT4)
VLTI Station Positions
Results
Exposure Time:
NDIT
=
DIT
=
sec
Warning! NDIT and DIT are still experimental!!!
Plots:
Toggle All / No Plots
Science object altitude
Science object spectrum
Science object azimuth
Science Spectrum in physical units
Visibility
Science SED on the detector
Squared Visibility
Fringe Tracking object spectrum
Airmass
Sky Transmission Spectrum
Loss of Correlated Magnitude
Sky Emission Spectrum
Baseline Length
Science SNR as a function of wavelength
(***)
Delay line limitations
Observability Constraints
(***) Those results are still experimental and not fully verified.
Send comments and questions via
https://support.eso.org/
