POLAR BEAR (17070)

COSPAR: 1986-088A | Alt Name: P87-1

Image
POLAR BEAR Satellite Image
Additional Sources
Launch Details

Launch Date

November 14, 1986

Launch Site

AFWTR

Launch Pad

SLC5

Launch Vehicle

Scout G-1

Orbital Elements

NORAD ID

17070

International Designator

1986-088A

Epoch

Sat, 04 Jul 2026 06:01:38 GMT

Apogee

Calculating...

Perigee

Calculating...

Inclination

89.62°

Right Ascension

175.70°

Eccentricity

Calculating...

Argument of Perigee

224.34°

Period

104.71 min

Mean Motion

13.75 rev/day

Latitude

Calculating...

Longitude

Calculating...

Altitude

Calculating...

Velocity

Calculating...

Polar Plot
3D Visualization
Basic Satellite Info

Name

POLAR BEAR

Alternative Name

P87-1

Type

Payload

Status

Unknown

Owner

STP/APL

Country

United States

Constellation

N/A

Related Satellites

Major Events

N/A

Latest TLEs
1 17070U 86088A   26185.25113721  .00000093  00000-0  84827-4 0  9994
2 17070  89.6189 175.7029 0037662 224.3395 146.3826 13.75290655987761

Source: Celestrak

Summary
The POLAR BEAR satellite, also known as P87-1, was an experimental spacecraft designated as 1986-088A and part of the Transit 5 series. Launched on November 14, 1986, from AFWTR SLC5 by a Scout G-1 vehicle, it was owned by STP/APL and operated for experimental purposes. The satellite had dimensions of 2 meters in length with a diameter of 0.5 meters and a span of 30 meters due to its shape being an octagonal cylinder with four panels and antennas. Its dry mass and launch mass were both 114 kilograms, powered by four deployable solar arrays and batteries. Equipped with an auroral imaging remote sensor and a beacon experiment as part of the NNS O-17 payload, POLAR BEAR was manufactured by APL (Applied Physics Laboratory). The satellite featured a radar cross-section (RCS) of 1.3714 but lacked detailed information on its attitude determination and control system (ADCS), color, transmitter frequencies, major events, material composition, or related satellites.
Physical Characteristics

Length

2

Diameter

0.5

Span

30

Dry Mass

114

Launch Mass

114

Shape

Oct Cyl + 4 Pan + Ant

Radar Cross Section

1.3714

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

NNS O-17

Purpose

Experimental

Mission

Experimental

Manufacturer

APL

Life Expectancy

Unknown

Bus

Transit 5

Configuration

Transit-Bus

Motor

?

Equipment

Auroral Imaging Remote Sensor, Beacon Experiment

Power System

4 deployable solar arrays, batteries

ADCS

Unknown

Transmitter Frequency

Unknown

Map
This tool will help you track the satellite's position and predict its upcoming passes over your location. Simply input the coordinates or click the geolocation button to get started.
Next Pass
Azimuth Elevation Time (Local)
Start Azimuth
Max Elevation
Stop Azimuth
Time Until
Pass Duration

Satellite Articles

View All Posts »

Learn more about satellites and other related topics.

Space Force Awards First-Ever $52M Satellite Deorbit Contract to Starfish Space | KeepTrack Space Brief

Space Force Awards First-Ever $52M Satellite Deorbit Contract to Starfish Space | KeepTrack Space Brief

Space Force awards first-of-its-kind $52M contract to Starfish Space for deorbiting defunct satellites. AST SpaceMobile selected for Missile Defense Agency SHIELD program. $26B Space Force budget confirmed.

X Report 7 Jun 2025

X Report 7 Jun 2025

SpaceX successfully launched the SXM-10 satellite for SiriusXM and prepares for the Ax-4 mission to the ISS amid political tensions involving Elon Musk and President Trump.

X Report 13 Dec 2025

X Report 13 Dec 2025

SpaceX continues making strides in satellite deployments and Starship preparations while managing challenges in space traffic.

Space Brief 18 Nov 2025

Space Brief 18 Nov 2025

Key updates on strategic military shifts, technological advancements, and a critical replacement mission for Chinese astronauts highlight today's space news.

NASA Declares MAVEN Dead; Eastern Range Damage Assessment Underway | KeepTrack Space Brief

NASA Declares MAVEN Dead; Eastern Range Damage Assessment Underway | KeepTrack Space Brief

NASA officially ended the MAVEN Mars orbiter mission after months of radio silence following an anomaly. Space Force assessing Eastern Range damage from separate incident affecting launch cadence.

X Report 16 May 2025

X Report 16 May 2025

Today's brief highlights the launch of United Airlines' Starlink Wi-Fi on passenger flights, updates on Starship development, and SpaceX's push to position Starlink as a GPS alternative in recent FCC discussions.

X Report 7 Aug 2025

X Report 7 Aug 2025

SpaceX's Crew-10 astronauts are set to return to Earth, while Impulse Space takes strides in spacecraft capabilities. Additionally, SpaceX prepares to launch 24 Amazon Project Kuiper satellites.

Apogee and Perigee

Apogee and Perigee

Understanding the high and low points of every orbit - from the International Space Station's careful dance with Earth's atmosphere to the extreme ellipses that take satellites to the edge of space and back.