Masat-1 and Meteor 3-2: close approach on 2.-th May

Masat-1 is on orbit since 2012 febr, during this time there was happened a "close approach"(*), and now 2.-th May 2013 was registered another one.
We had Alert msg before 2 days from United States Joint Space Operations Center. This Alert message was forwarded by our member, Andras Bato, HA6NN to our small interest group:

Subject:     MASAT-1 Close Approach Notification
Date:     Tue, 30 Apr 2013 19:07:13 +0000
From:     JSpOC/Space Correspondence <>


The United States Joint Space Operations Center (JSpOC) has identified a
predicted conjunction between MASAT-1 (SCC# 38081) and SCC# 19336.

Primary Object MASAT-1 (SCC# 38081)
Secondary Object: SCC# 19363
Time of Closest Approach: 02 MAY 2013 17:12 UTC

Overall miss distance: 170 meters
Radial (dU) miss distance: 138 meters
In-Track (dV) miss distance: -30 meters
Cross-track (dW) miss distance: 96 meters

Primary Radial Error (U): 503 meters
Primary In-Track Error (U): 20674 meters
Primary Cross-track Error (U): 107 meters

Secondary Radial Error (U): 17 meters
Secondary In-Track Error (U): 41 meters
Secondary Cross-Track Error (U): 18 meters

It is possible to provide another estimate using owner/operator ephemeris
data.  If the satellite operator is interested please have them reply to all
addresses listed in the Cc line.  Email is the preferred method of

Thank you for your time and assistance.  Please contact us if there are any

Very Respectfully,

JSpOC Orbital Protection Team
Joint Space Operations Center
Vandenberg Air Force Base, California USA
Commercial: 1-805-605-3533

We are in a small radio amateur group, decided to try follow the events as close as possible. We havenot too much "resources" for this. Here is a short summary of our activity on this day:

1. - we discussed "real time" the possible events in our small group,      muholdasok <>
2. - we had set up a tracker page on Simone Corbellinie,s satflare site support to follow the orbits of the involved objects online for everybody. This was the page URL:,19336,19363#TOP

3. - we have a tool, primerely use of it to support the android app for Masat-1. This is a nice app runing on Android mobile phones, display basic telelmetry informations received real time by radio amateurs worldwide, from Masat-1.
Behind this apps there is a database server, have a little more informations, connected to the activities of the radio amateurs, receiving the Masat-1 telemetry. More info about this tools can read on this separate page:
Monitoring the activity around Masat-1

Around the predicted time of the close approach, we start in every minute to download, and examine the avaliable database record, special attention to the values of the PacketCounter in it: had happens any new uploads from radio amateurs the received telemetry data or not?
You can see the increased Packet Counter value, caused by the first succesfull uploaded by new data, after the predicted close approach time in the attached records here.
The first record,s time stamp is before the "event", the second record was time-stamped at the server after the "event".


  "DataBaseID": 161797,
  "InsertedTimeStamp": "2013-05-02T16:05:02.71",
  "IsAlive": true,
  "BeaconMessage": "Masat-1 MO-72",
  "BatteryTemperature": 8.0,
  "BatteryVoltage": 4.1,
  "TMPacketCounter": 14502908,
  "SideTemperature": {
    "X+": 20.0,
    "X-": 21.0,
    "Y+": 20.0,
    "Y-": 20.0,
    "Z+": 25.0,
    "Z-": 23.0
  "DataBaseID": 161816,
  "InsertedTimeStamp": "2013-05-02T17:38:38.137",
  "IsAlive": true,
  "BeaconMessage": "Masat-1 MO-72",
  "BatteryTemperature": 8.0,
  "BatteryVoltage": 4.1,
  "TMPacketCounter": 14504882,
  "SideTemperature": {
    "X+": 18.0,
    "X-": 20.0,
    "Y+": 19.0,
    "Y-": 17.0,
    "Z+": 27.0,
    "Z-": 18.0
So: approx 20 min later, after the "close approach" minute, there was a radio amateur, who received new data, and he (more exactly the Masat-1 telemetry decoder software) uploaded the data to the central server running at the Control Station. You can see, the variable TMPacketCounter value increased by 1974 new packets.
On the attached screenshot you can see the "situation"/constellation of the 2 objects, Masat-1 and the Meteor 3-2 on satflare tracker page. It was happened on the ocean, far away from Hawaii, in the west-south direction. You can see more data, coordinates on the screenshot.

t.janos hg5apz at gmail
Fri May  3 11:00:06 CEST 2013

More informations about the russian Meteor 3-2. Collected by Andras Batto:

A tettes ismert:

Név: METEOR 3-2
Start: 1988-07-26

Acronym Meteor-3-2
Full name Meteor-3-2
Satellite Description
  • 2nd flight unit of the Meteor-3 series
  • Main missions: cloud observation and IR temperature/humidity sounding.
  • Significant contribution to Space weather.
Mass at launch 2150 kg Dry mass
Power 500 W
Orbit Drifting orbit Altitude 1200 km
Inclination 82.5 °

The first Close Approach event was detected at 4 oct. 2012. Here are picture and a simulation video from the Control Team.
Thanks the info and links for Laci Kokuti and Gergo Barta.
Masat-1 and FENGYUN 1C DEB close approach