• mag limit ~17 @G-N
• 6-10 mags contrast
• diffraction-limited
• 2-colors simultaneous
• narrow & broad filters
• narrow & wide field modes
• typ. obs 1-10mins

0.011'' @u

0.026'' @832nm

6.7''

60''

19''

56''

angres:

11

15

17

22

26

mas

Speckle

• 10mas/pxl
• mag limit ~17
• contrast limit ~8

Wide Field

• 73mas/pxl

Speckle

• 18mas/pxl
• mag limit ~14
• contrast limit ~6

Wide Field

• 81mas/pxl

0.011'' @u

0.026'' @832nm

0.025'' @u

0.060'' @832nm

6.7''

60''

19''

56''

Open to the community

• NOAO proposal process
• NESSI - WIYN@KPNO
• `Alopeke - Gemini-N
• DSSI -> Zorro - Gemini-S
• Transitioning from visitor to ''Resident'' instrument

NEAs

• sizes
  • radar typically quotes 40% uncertainties
  • albedo/radar size mismatch
• shapes
  • adapt stellar surface modeling tools
  • light curve inversion/illumination model 

model: Franck Marchis

Point source PS

Phaethon power spectrum (resolved)

Fringe spacing

Fringe orientation

Fringe Depth

Binary separation

Binary position angle

Binary magnitude difference

a single star, a circle representing the isoplanatic patch, and the small star shapes are "speckles"

a single star, the smaller circles show worse seeing and smaller isoplanatic patches, each producing "speckles"

a binary pair, close enough that they share an isoplanatic patch, producing "speckles" that correspond to their separation & position angle

a binary pair, wherein the ratio of their separation to the isoplanatic patch size is such that their "speckles" are not correlated

Seeing-limited

Reconstructed

42''

Two-color wide-field speckle reconstruction

from NESSI

• 0.25'' resolution from 500 frames (20s)
• compromise b/t angres and contrast
• Seeing ~ 0.85''

Fulton

• Large radius errors originally hid distribution features
• Fulton gap revealed after CKS (10% stellar radius errors)
• Accounting for binarity shifts gap in the distribution

brightest companion 1''

brightest companion 2''

Shift from 1.8 to 2.2 

• increased water/ice vs pure Si rock