USA-251

USA-251
Spacecraft properties
A Block IIF GPS satellite

Mission type	Navigation
Operator	US Air Force
COSPAR ID	2014-026A^[1]
SATCAT №	39741^[1]
Mission duration	12 years (planned)

Spacecraft	GPS SVN-67 (IIF-6)
Spacecraft type	GPS Block IIF
Manufacturer	Boeing
Launch mass	1,630 kilograms (3,590 lb)^[2]

Start of mission
Launch date	17 May 2014, 00:03 (2014-05-17UTC00:03Z) UTC
Rocket	Delta IV-M+(4,2), D365^[3]
Launch site	Cape Canaveral SLC-37B^[3]
Contractor	ULA

Orbital parameters
Reference system	Geocentric
Regime	Medium Earth (Semi-synchronous)
Perigee	20,443 km (12,703 mi)^[4]
Apogee	20,474 km (12,722 mi)^[4]
Inclination	55.04 degrees^[4]
Period	729.22 minutes^[4]
Epoch	17 May 2014

USA-251, also known as GPS IIF-6, GPS SVN-67 and NAVSTAR 70, is an American navigation satellite which forms part of the Global Positioning System. It was the sixth of twelve Block IIF satellites to be launched.^[2]

Launch

Built by Boeing and launched by United Launch Alliance, USA-251 was launched at 00:03 UTC on 17 May 2014, atop a Delta IV carrier rocket, flight number D366, flying in the Medium+(4,2) configuration.^[3] The launch took place from Space Launch Complex 37B at the Cape Canaveral Air Force Station,^[5] and placed USA-251 directly into medium Earth orbit.^[4]

Orbit

As of 17 May 2014, USA-251 was in an orbit with a perigee of 20,443 kilometers (12,703 mi), an apogee of 20,474 kilometers (12,722 mi), a period of 729.22 minutes, and 55.04 degrees of inclination to the equator.^[4] It is used to broadcast the PRN 06 signal, and operates in slot 6 of plane D of the GPS constellation. The satellite has a design life of 15 years and a mass of 1,630 kilograms (3,590 lb). ^[2] It is currently in service following commissioning on June 10, 2014.^[6]

References

1 2 "Navstar 70". US National Space Science Data Center. Retrieved 17 May 2014.
1 2 3 Krebs, Gunter. "GPS-2F (Navstar-2F)". Gunter's Space Page. Retrieved 17 May 2014.
1 2 3 McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 17 May 2014.
1 2 3 4 5 6 McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 17 May 2014.
↑ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 17 May 2014.
↑ "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014049". United States Coast Guard. Retrieved 11 June 2014.

NAVSTAR Global Positioning System satellites

List of GPS satellites

Block I	1 2 3 4 5 6 7† 8 9 10 11

Block II	1 2 3 4 5 6 7 8 9

Block IIA	1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Block IIR	1† 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Block IIRM	1 2 3 4 5 6 7 8

Block IIF	1 2 3 4 5 6 7 8 9 10 11 12

Block IIIA	1 2 3 4 5 6 7 8

Italics indicate future missions. Signs † indicate launch failures.

← 2013 · Orbital launches in 2014 · 2015 →

January	GSAT-14 – Thaicom 6 – CRS Orb-1 (Flock-1 × 28 · ArduSat-2 · Lituanica SAT-1 · LitSat-1 · SkyCube · UAPSat-1) – TDRS-L

February	Progress M-22M – ABS-2 · Athena-Fidus – Türksat 4A – USA-248 – GPM Core · Ginrei · KSAT-2 · INVADER · OPUSAT · STARS-II · TeikyoSat-3 · ITF-1

March	Ekspress AT1 · Ekspress AT2 – Astra 5B · Amazonas 4A – Kosmos 2494 – Soyuz TMA-12M – Shijian XI-06

April	USA-249 – Sentinel-1A – IRNSS-1B – Progress M-23M – Ofek-10 – USA-250 – EgyptSat 2 – SpaceX CRS-3 · KickSat · PhoneSat 2.5 · ALL-STAR/THEIA · SporeSat · TestSat-Lite – Luch 5V · KazSat-3 – KazEOSat 1

May	Kosmos 2495 – Ekspress AM4R – USA-251 – USA-252 – Kosmos 2496 · Kosmos 2497 · Kosmos 2498 · Kosmos 2499 – ALOS-2 · Raijin-2 · UNIFORM-1 · SOCRATES · SPROUT – Eutelsat 3B – Soyuz TMA-13M

June	Kosmos 2500 – Deimos-2 · KazEOSat 2 · Hodoyoshi 3 · Hodoyoshi 4 · AprizeSat 9, 10 · BRITE-Montreal · BRITE-Toronto · BugSat 1 · SaudiSat-4 · TabletSat-Aurora · UniSat-6 (AeroCube-6 · ANTELSAT · Lemur-1 · Tigrisat) · DTUSat-2 · Duchifat-1 · NanoSatC-Br 1 · PACE · Perseus-M × 2 · PolyITAN-1 · POPSAT-HIP-1 · QB50P1 · QB50P2 · Flock-1c × 11 – SPOT 7 · CanX-4 · CanX-5 · AISat · VELOX-I

July	OCO-2 – Gonets-M 18, 19, 20 – Meteor-M 2 · AISSat-2 · DX-1 · Relek · SkySat-2 · TechDemoSat-1 · UKube-1 – O3b × 4 (FM3, FM6, FM7, FM8) – CRS Orb-2 (Flock-1b × 28 · TechEdSat-4) – Orbcomm-2 × 6 – Foton-M No.4 – Progress M-24M – USA-253 · USA-254 · USA-255 – Georges Lemaître ATV

August	USA-256 – AsiaSat 8 – Yaogan 20 A, B, C – WorldView-3 – Gaofen 2 · Heweliusz – Galileo FOC-1 · Galileo FOC-2

September	Chuangxin 1-04 · Lingqiao – AsiaSat 6 – Yaogan 21 · Tiantuo 2 – MEASAT 3b · Optus 10 – USA-257 – SpaceX CRS-4 – Soyuz TMA-14M – Olimp-K – Shijian XI-07

October	Himawari 8 – IRNSS-1C – Intelsat 30 · ARSAT-1 – Yaogan 22 – Ekspress AM6 – Chang'e 5-T1 · 4M – Shijian 11-08 – Cygnus CRS Orb-3 (Arkyd-3 · Flock-1d × 26 · GOMX-2 · RACE) – Progress M-25M – USA-258 – Meridian 7

November	Sasuke · Hodoyoshi 1 · Kinshachi 1 · Tsukushi · Tsubame – Yaogan 23 – Yaogan 24 – Kuaizhou 2 – Soyuz TMA-15M – Kosmos 2501

December	Hayabusa 2 · PROCYON · Shinen 2 · DESPATCH – Orion EFT-1 – DirecTV-14 · GSAT-16 – CBERS-4 – Yaogan 25 A, B, C – USA-259 – Yamal-401 – O3b × 4 (FM9 to FM12) – Kondor-E No.2 – IPM – Kosmos 2502 – Resurs-P No.2 – Yaogan 26 – Astra 2G – Fengyun 2-08

Launches are separated by dashes ( – ), payloads by dots ( · ). Manned flights are bolded. Launch failures are in italics. Payloads deployed from other spacecraft are (enclosed in brackets).

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