Please make a donation to support Gunter's Space Page.
Thank you very much for visiting Gunter's Space Page. I hope that this site is useful and informative for you.
If you appreciate the information provided on this site, please consider supporting my work by making a simple and secure donation via PayPal. Please help to run the website and keep everything free of charge. Thank you very much.

E1P (Explorer 1 Prime) / HRBE

E1P (Explorer 1 Prime) [Montana Space Grant Consortium]

Explorer 1 [PRIME] (E1P) is a Montana Space Grant Consortium Cubesat-class satellite in development by the Space Science and Engineering Laboratory (SSEL) at Montana State University.

Its mission is to detect the Van Allen radiation belts in honor of the 50th anniversary of Explorer-1, America's first satellite that first discovered the cloud of highly energetic electrons trapped in the Earth's magnetic field.

E1P will carry a miniature Geiger tube donated by Dr. Van Allen using it to measure the intensity and variability of these electrons in low earth orbit.

E1P will demonstrate software technology developed at SSEL that uses a popular chip radio to close a digital data link with standard ham radio hardware allowing people around the world to contact the satellite and download science and housekeeping data.

The launch on a Taurus-3110 failed on 04.03.2011 when the payload fairing did not separate.

A second flight model, E1P U2, was launched through the NASA Educational Launch of Nanosatellites (ELaNa) program in October 2011. After reaching successfully orbit, it was renamed HRBE (William A. Hiscock Radiation Belt Explorer). After deployment, E1P U2 stayed magnetically attached to another cubesat, M-Cubed/COVE. The exact cause of the conjunction is unknown, and it is hypothesized that it was caused by the magnets in both satellites. Both CubeSats include a permanent magnet for passive attitude control. HRBE did not suffer due to this connection.

Nation: USA
Type / Application: Magnetospheric Research
Operator: Montana Space Grant Consortium
Contractors: Montana Space Grant Consortium
Configuration: CubeSat (1U)
Propulsion: None
Power: Solar cells, batteries
Mass: 1 kg
Satellite COSPAR Date LS Launch Vehicle Remarks
E1P (Explorer 1 Prime) 2011-F01 04.03.2011 Va 576E F Taurus-3110 with Glory, KySat 1, Hermes
E1P U2 (Explorer 1 Prime F2) → HRBE 2011-061F 28.10.2011 Va SLC-2W Delta-7920-10C with NPP, RAX 2, DICE 1, DICE 2, AubieSat 1, M-Cubed/COVE