swap_horiz Hipparcos Alternatives

1

Planck Observatory

The Planck Observatory was a European Space Agency satellite launched in 2009. It meticulously measured microwave radiat...

Space Historical Microwave Cmb

9.17 Excellent

2

Cassini-Huygens

The Cassini-Huygens mission, operated by NASA and ESA, was a space-based observatory dedicated to studying Saturn and it...

Decommissioned Nasa Planetary Space Based

9.02 Excellent

3

Gaia

The Gaia observatory is a space-based mission operated by the European Space Agency. It meticulously surveys our galaxy,...

Survey Optical Space Based Astrometry

8.92 Great

4

Kepler Space Telescope

The Kepler Space Telescope was a NASA observatory launched in 2009. It monitored over 150,000 stars for dips in brightne...

Decommissioned Optical Nasa Space Based

8.83 Great

5

Planck

The Planck mission was a European Space Agency-operated observatory designed to study the Cosmic Microwave Background (C...

Decommissioned Microwave Space Based Cmb

8.60 Great

6

SOHO

SOHO is a space-based observatory operated jointly by NASA and the European Space Agency. It monitors the Sun’s activity...

Solar Nasa Space Based Esa

8.56 Great

7

Spitzer Space Telescope

The Spitzer Space Telescope was a NASA space-based observatory operating from 2003 to 2020. It utilized infrared light t...

Survey Decommissioned Nasa Infrared

8.46 Great

8

Herschel Space Observatory

The Herschel Space Observatory is a decommissioned space-based observatory operated by the European Space Agency (ESA)....

Decommissioned Infrared Space Based Esa

8.37 Great

9

XMM-Newton

The XMM-Newton observatory, operated by ESA, observes the universe primarily in X-rays. Its large telescope allows for d...

High Energy Space Based X Ray Photometry

8.19 Great

10

BeppoSAX

BeppoSAX was a European Space Agency observatory launched in 1996. This satellite primarily observed X-rays and gamma ra...

Historical Space Based X Ray Gamma Ray Bursts

8.19 Great

11

Compton Gamma Ray Observatory

The Compton Gamma Ray Observatory was a NASA space-based observatory that operated from 1991 until its decommissioning i...

Decommissioned High Energy Nasa Space Based

8.14 Great

12

ROSAT

ROSAT, short for Röntgensatellit, was a German-led space observatory launched in 1990 for X-ray and extreme-ultraviolet...

Germany Decommissioned All Sky Space Based

7.91 Good

13

Hinode

Hinode, which translates to "sunrise" in Japanese, is a solar observation satellite developed by the Japan Aerospace Exp...

Solar Space Based X Ray Esa

7.73 Good

14

RXTE

The Rossi X-ray Timing Explorer (RXTE) was a NASA satellite launched on December 30, 1995, to study time variability in...

Decommissioned Nasa Space Based Timing

7.73 Good

15

LISA Pathfinder

LISA Pathfinder was an European Space Agency technology demonstrator spacecraft launched on December 3, 2015. Its primar...

Decommissioned Space Based Gravitational Wave Esa

7.73 Good

16

IXPE

The Imaging X-ray Polarimetry Explorer (IXPE) is a NASA space observatory launched on December 9, 2021, designed to meas...

Nasa Space Based X Ray Esa

7.54 Good

17

Suzaku

Suzaku was a Japanese space telescope developed for X-ray astronomy by the Japan Aerospace Exploration Agency in collabo...

Decommissioned Space Based Spectroscopy X Ray

7.45 Good

18

INTEGRAL

INTEGRAL (International Gamma-Ray Astrophysics Laboratory) is a space telescope launched by the European Space Agency on...

High Energy Space Based Gamma Ray X Ray

7.18 Good

19

EXOSAT

EXOSAT was a European Space Agency space observatory launched in 1983 to study X-ray sources beyond Earth. Operating unt...

Decommissioned Historical Space Based X Ray

6.99 Fair

20

Astro-H / Hitomi

ASTRO-H, later named Hitomi, was a Japanese X-ray astronomy satellite developed by JAXA with international partners, inc...

High Resolution Decommissioned Space Based X Ray

4.14 Poor