[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6},"actionData","errors","pages/wordpress/index",{"_7":8,"_9":-5},"document",{"_10":11,"_12":13,"_14":15,"_16":17,"_18":19,"_20":21,"_22":23,"_24":25,"_26":27,"_28":29,"_30":31,"_32":33,"_34":35,"_36":19,"_37":38,"_39":21},"offline","id",796,"type","page","path","/resources/vmdb/","slug","vmdb","title","Visual Meteor Database","excerpt","Whenever you use the data for analyses, please do not forget to mention the source of the data in any publication. You can link to this page using <a href=\"/resources/vmdb/\">data source<a> The VMDB contains about 3,000,000 meteors obtained by standardized observing methods which were collected during the last ~25 years. The actual database is stored in dBase format; extracts in ASCII format can be downloaded here. Rates Magnitudes Year Records Meteors Teff Records Meteors 1984 274 3990 516.25 83 645 1985 1449 35058 2113.35 0 0 1986 1966 40310 2209.94 817 22257 1987 1297 22000 1652.85 332 6637 1988 4676 115298 5684.32 3259 65712 1989 4557 89493 5322.32 3221 49416 1990 3447 79053 4487.60 4224 64585 1991 4169 139308 5359.86 5175 109191 1992 3794 76811 4528.88 4333 62049 1993 8065 178690 7537.80 6472 140529 1994 4631 106361 5455.41 4856 81138 1995 5924 102804 6675.59 7751 95528 1996 7531 151428 7833.82 7412 121341 1997 9162 192364 9660.06 9208 160555 1998 12141 223448 11084.73 10520 173924 1999 22137 485755 11598.56 13140 200497 2000 12328 168699 10773.63 9311 122234 2001 20244 334304 7733.74 13731 208663 2002 13380 169329 4675.73 9430 119389 2003 3246 36504 2798.50 3754 34628 2004 13141 122807 3568.23 12112 106223 2005 6113 67953 2830.11 5940 63879 2006 4520 56950 2844.50 4817 53968 168192 2998717 126945.78 139898 2062988 Rate data Magnitude data Last update RATE_84.TXT (35KB) MAGN_84.TXT (12KB) 01/09/07 RATE_85.TXT (184KB) MAGN_85.TXT (0KB) 01/09/07 RATE_86.TXT (250KB) MAGN_86.TXT (123KB) 01/09/07 RATE_87.TXT (165KB) MAGN_87.TXT (50KB) 01/09/07 RATE_88.TXT (594KB) MAGN_88.TXT (489KB) 01/09/07 RATE_89.TXT (579KB) MAGN_89.TXT (483KB) 01/09/07 RATE_90.TXT (438KB) MAGN_90.TXT (634KB) 01/09/07 RATE_91.TXT (529KB) MAGN_91.TXT (776KB) 01/09/07 RATE_92.TXT (482KB) MAGN_92.TXT (650KB) 01/09/07 RATE_93.TXT (1032KB) MAGN_93.TXT (1010KB) 01/09/07 RATE_94.TXT (588KB) MAGN_94.TXT (753KB) 01/09/07 RATE_95.TXT (752KB) MAGN_95.TXT (1201KB) 01/09/07 RATE_96.TXT (956KB) MAGN_96.TXT (1149KB) 01/09/07 RATE_97.TXT (1164KB) MAGN_97.TXT (1427KB) 01/09/07 RATE_98.TXT (1542KB) MAGN_98.TXT (1631KB) 01/09/07 RATE_99.TXT (2834KB) MAGN_99.TXT (2037KB) 01/09/07 RATE_00.TXT (1590KB) MAGN_00.TXT (1453KB) 01/09/07 RATE_01.TXT (2611KB) MAGN_01.TXT (2142KB) 01/09/07 RATE_02.TXT (1726KB) MAGN_02.TXT (1471KB) 01/09/07 RATE_03.TXT (419KB) MAGN_03.TXT (586KB) 01/09/07 RATE_04.TXT (1695KB) MAGN_04.TXT (1889KB) 01/09/07 RATE_05.TXT (789KB) MAGN_05.TXT (927KB) 01/09/07 RATE_06.TXT (583KB) MAGN_06.TXT (751KB) 01/09/07 VMDBRAD.TXT (14KB) - The radiant catalog. VMDBPERS.TXT (260KB) of 2002 October 10 - translating IMO observer codes into names. VMDBSITE.TXT (155KB) of 2002 October 10 - translating IMO sitecodes into geographical coordinates. */ ?> Description of the data VMDBRAD.TXT: All showers mentioned in the rate and magnitude files are stored. Note that this file contains many more showers than the current IMO working list. The field \"Shw\" stores the three-letter code of each radiant as it is referenced in the rate and magnitude data. Dates of activity period and maximum are given in British format (DD/MM). \"Alpha\" and \"Delta\" are the radiant position and refer to the date of maximum; the radiant position at other dates can be obtained by the daily motion \"dAlpha\" and \"dDelta\". \"V\" is the geocentric (pre-atmospheric) velocity of the stream, \"r\" is the population index. \"TeX-Name\" gives the TeX transcription of the shower name. VMDBSITE.TXT: All observing sites known to the VMDB are listed. This file is not necessary for the rate and magnitude data where the site coordinates are given to a precision of one decimal place. The site file stores coordi- nates in degree-minute-second format with additional fields for E/W and N/S resp. \"TeX-Name\" gives the TeX-typesetting of the name of the location. VMDBPERS.TXT: All observer codes appearing in the rate and magnitude files are listed here. \"TeX-Name\" and \"TeX-Firstname\" give the TeX-typesetting of the observer's names. RATE_xx.TXT: These files are available per year where the year replaces the \"xx\". Activity levels of meteor showers can be calculated from these files. The meteor numbers list the sporadics first, followed by the abbreviation of the first shower and its corresponding number of meteors. You will notice a shower 'DIV' which comprises a number of radiants not resolved during the observation (mainly used for Aquarids). This way the sporadic rate is cleaned of other sources. Note: The date of each record refers to the start time of the period. All times are UT. Solar longitudes refer to equinox 2000.0. MAGN_xx.TXT: These files are available per year where the year replaces the \"xx\". The population index r and, hence, the mass index can be calculated from these files. The records are sorted by shower name, date and solar longitude. Note: The date of each record refers to the middle of the period. It is rounded to the next day when the middle of the period is after noon. A record as DD=12, MM=08 and TTTT-TTTT=2100-2300 (middle 2200) means the actual observation taking place on August 11 in the evening. DD=12, MM=08 and TTTT-TTTT=0100-0300 (middle 0200) means the morning hours of August 12. An observation with DD=12, MM=08 and TTTT-TTTT=1100-1300 (middle 1200) was made on August 12 at noon, however, a record with DD=12, MM=08 and TTTT-TTTT=1100-1400 (middle 1230) represents an observations on August 11 in the afternoon. Remember that this is only valid for magnitude files. The reason for this convention is historic. In files prior to 1991 you will find quite a number of records without a TTTT-TTTT value. At this time only the date of the magnitude distribution was stored. As a consequence, the date had to be that of the nearest 0h-UT. Moreover, no sitecode was stored for a number of magnitude distributions. All times are UT. Solar longitudes refer to 2000.0. If no TTTT-TTTT value was available, the solar longitude was calculated using 0h UT. Some records have no geographical coordinates of the location. These locations must be retraced in the corresponding rate file. Remarks It is a tremendous work to maintain a database of such comprehensiveness. Several amateur astronomers have contributed to the VMDB, either entering data or introducing the standards. If you encounter any inconsistency in the data, do not hesitate to let us know . If you encounter a mis-spelled name of an observer or location drop a message too.","placeholder",false,"content","

The Visual Meteor Database (VMDB) contains almost 4,000,000 meteors obtained by standardized observing methods which were collected since 1982.

This central archive of amateur visual observations is open to:

Analyses of activity profiles, population index profiles, flux density profiles and mass index profiles.
IMO members and professional meteor astronomers, for access to its data.

","date","2005-05-15 12:55:49","modified","2016-08-09 19:21:45","author_id",1,"parent_id",6194,"comments",[],"seo_title","author","Luc Bastiaens","description"]