NFC database

The catalogue of meteor orbits from the NFC systems is created by using the software UFO Orbit v2.41. In the program UFO Orbit v2.41, all combinations of meteors in a time interval dt = 3 s are created. For these combinations, the level Q0 is set and some other additional conditions also have to be set:

• dur > 0.08 s (duration of the meteor)
• dt < 3 s (maximum time difference between 2 stations)
• GD < 10 km (minimum ground distance between 2 stations)
• Gm% > −100% (overlap of a meteor sighting from two stations)
• 15 km < H1 < 200 km (beginning height)
• H2 < 200 km (terminal height)
• dV < 4 km/s (the largest difference in velocity between stations considered to compute the orbit)

NFC DATABASE STATISTICS
YEAR	SINGLE METEORS	PAIRED METEORS	RAW ORBITS	STATIONS/ORBIT	PAIRING EFFICIENCY (%)	NFC ORBITS	REDUCTION (%)
2014	54	28	14	2.000	51.85	12	85.71
2015	4 324	1 776	888	2.000	41.07	526	59.23
2016	6 517	2 322	1 161	2.000	35.63	696	59.94
OVERALL	10 895	4 126	2 063	2.000	37.87	1 234	59.82

The single-station meteor statistics from the individual stations using the NFC system. The pairs are made up of stations as follows: Kroměříž (CZ) + Valašské Meziříčí (CZ), Zákopčie (SK) + Kysucké Nové Mesto (SK) and Senec (SK) + Blahová (SK).

NFC STATIONS STATISTICS
YEAR	KROMĚŘÍŽ	VALAŠSKÉ MEZIŘÍČÍ	ZÁKOPČIE	KYSUCKÉ NOVÉ MESTO	SENEC	BLAHOVÁ	OVERALL
2014	29	25	0	0	0	0	54
2015	1 306	987	726	581	321	403	4 324
2016	1 076	1 006	762	613	1 381	1 679	6 517
OVERALL	2 411	2 018	1 488	1 194	1 702	2 082	10 895

The NFC orbit database (created according to Koukal et al. 2015) contains orbital elements and geophysical data of 1 234 meteors from 2014 to 2016 (latest update 30.1.2018). The database is saved in csv format and contains the data of all unified orbits within the given criteria.