Observation Sector 99

TESS Observation Sector 99 is comprised of observations made during orbits 209 and 210 of the TESS mission.  Observations extend from January 5 through February 2, 2026. Sector 99 is the first of sixteen “rolled” sectors focusing on the southern ecliptic mid-latitude range. The regions of the sky observed are shown at right.

Pointing

The orientation of the spacecraft and camera boresights are given in the table below.
BoresightRADecRollEcliptic
Longitude		Ecliptic
Latitude
Spacecraft157.205-41.158-144.064179.5-46.0
Camera 1136.699-10.028-63.339142.5-25.4
Camera 2149.010-31.132-58.922164.8-40.5
Camera 3168.241-50.399133.883196.7-49.3
Camera 4206.584-62.969166.469233.1-47.4
All coordinates are degrees (J2000)

Map of TESS camera fields-of-view in ecliptic coordinates.  Camera 1 is red, camera 2 is magenta, camera 3 is blue, camera 4 is green.  The field of camera 4 looks distorted because it is centered on the ecliptic pole. The thin black line is the ecliptic; the thick black line is the galactic plane.

Map of TESS camera fields-of-view in celestial coordinates.  Camera 1 is red, camera 2 is magenta, camera 3 is blue, camera 4 is green. The thin black line is the ecliptic; the thick black line is the galactic plane.

Targets for Sector 99

During Sector 99, 12,000 stars will be observed at two-minute cadence, up to 3,000 stars at 20-second cadence, and full-frame images will be collected every 200 seconds.
The list of targets observed at two-minute cadence are posted on the Target List page as soon as they have been determined. The target list includes the camera and CCD on which the target can be found, TIC ID, RA, declination, and TESS magnitude.

Earth and Moon Locations in the TESS Fields

Refer to Scattered Light page for an overview of these plots.
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