IMAP (Interstellar Mapping and Acceleration Probe) is  mission 5 in the
NASA STP (Solar Terrestrial Probe) series; PI D. McComas (Princeton). It
was built and is operated by APL, and its mission is to study the flow
of the interstellar gas near the Earth using energetic neutral atom 
(ENA) imagers. IMAP is a cylinder 0.9m tall 2.4m dia plus a
magnetometer boom, length 2.5m (for total span 4.9m) with a launch mass
of about 900 kg wet including 144 kg of hydrazine for its 12 L3Harris MR-111G
hydrazine thrusters.  (Does anyone have a more accurate mass for IMAP?)

The instruments are:

IMAP-Lo (UNH) - a  low energy ENA imager with a 9 degree field of view (FOV), covering the 0.005-1 keV energy range.

IMAP-Hi (LANL and others) - a  pair of high energy ENA imagers covering the 0.4-15.6 keV range, scanning the ecliptic plane and poles

IMAP-Ultra (APL) - a  pair of high energy ENA imagers covering the 3-300 keV range, with 2 deg angular resolution

MAG (Imperial College) - a vector triaxial fluxgate magnetometer, with 500nT range.

SWAPI (Princeton) - the Solar Wind and Pickup Ions instrument to study H and He ions in the 0.1 to 20 keV/q energy range

HIT (GSFC) -High Energy Ion Telescope,  ion and electron energetic particle spectrometer,  energy range 2-40 MeV/nuc.

GLOWS (CBK PAN, Poland) - Global Solar Wind Structure, map heliospheric resonant backscatter glow of H Lyman-alpha 1216A and He 584A.

SWE (LANL)  Solar Wind Electrons -  3D distribution of thermal and suprathermal e, 1 eV-5 keV.

CoDICE (SwRI) Compact Dual Ion Composition Experiment,  mass/charge of ions. Electrostatic analyser with a TOF/E system to
measure 3D velocity distribution function, charge and mass of 0.5 to  80 keV/q ions (CoDICE-LO) and
energetic particle spectrometer (CoDICE-HI) for mass and direction of 0.03-5 MeV/nucleon ions and 20-600 keV e.

IDEX (CU-LASP)  Interstellar dust experiment; impact ionization / time of flight MCP detector to measure mass spectrum of component elements.
 

Carruthers Geocorona Observatory  is a NASA STP Mission of Opportunity, 
led by PI L. Waldrop (UIUC) and built by BAE Systems (former Ball). It
carries GCI (Geocoronal Imager). a set of ultraviolet imagers developed
by UC Berkeley to study hydrogen Lyman-alpha emission from the Earth's
exosphere, sensitive in approximately the 110-140 nm band.  Mass 240 kg
wet; size 1.72 x 1.08 x 0.97m . The GCI consists of the NFI (Narrow
Field Imager), with a 3.6 deg field of view imaging out to 7 Earth
radii, and the WFI (Wide Field Imager) with an 18 degree field of view
out to 30 Earth radii.


SWFO-L1 (Space Weather Follow On - L1) is a NOAA-NESDIS space weather 
observatory built by BAE Systems/Boulder using the Evolve bus. Mass is
377 kg wet 304 kg dry. Size is roughly 1.5 x 1.5 x 2.0m with a 5.6m long
magnetometer boom.

Its instruments are:

CCOR-2 (NRL) Compact Coronagraph, imaging 3.5 to 26 solar radii with 65
arcsec resolution and a 4 Mpix camera sensitive in the  470-740 nm band.

SWIPS (SwRI), Solar Wind Plasma Sensor, electrostatic analysers for
velocity, density, temperature of low energy ions, 0.2-32 keV/e,  and
protons at 180-2500 km/s. 

STIS (Berkeley), Suprathermal Ion Sensor,
measuring 25 keV - 6 MeV high energy ions 

MAG (UNH/SwRI/), a fluxgate magnetometer measuring 64 mag field vectors per second.

The three spacecraft will be launched no earlier than 1532 UTC Sep 23 on Falcon 9 B1096.2 from Kennedy Space Center pad 39A.
The Falcon 9 first stage will land on the JRTI droneship. The second stage will reach a low parking orbit
and then reignite to enter a 200 x 1170000 km x 28.4 deg Lagrange transfer orbit 1h 13m after launch. IMAP will separate
at T+1:23:51; SWFO-L1 at T+1:30:26; Carruthers at T+1:36:46. The second stage will probably make
a disposal burn to heliocentric orbit, whose parameters are not currently public but I'll be harrassing
the SpaceX folks to fix that after the launch, unless the asteroid astronomers spot it for us.