The most members online in one day was 581, 8th March 2010.
661-pete, A McEwan, acey, acharris77, acme, adamh, adamsp123, Adrian Condon, adt175, afm038, agamos, ajfdab, Alan, alcyone, Alestrom, alfingido, AllanJ, alrobinson121, altec, Andrew*, AndrewT, AndyC, AndyH, andyr, Angeleyes, annid, ant, anthony, Apatchy, arad85, Archimedes, argonaut, artyfarty, assouptro, astoc, Astro Adj, Astro Fan, astro84, astroeddie, astrokat, astromerlin, AstroNinja, Astroscot2, astrosnaps, AstroTiger, astrotom, Astro_Baby, athlon, AWR, Aza, AztecastroMcJ, Badger, barkis, barryfitgerald, BAZ Senior, BazMark, beamish, Beardy Bob, beetlejuice, Ben Ritchie, Beulah, BeyondVision, bhrugen, bigal1, BillBwithley, bish, Bizibilder, Black Shuck, blacksaltire, blackthorn, blinky, BlueAstra, bob1957, Bobcat, Bodkin, bostik, brantuk, Breakintheclouds, Brendanof Borg, brendant, Brett, Brian M, brianb, brianbloke, BrownClaw, Bryndalf, budski, bunnygod1, callisto, callump, Catanonia, catburglar, cathalferris, cdd2455, CELESCOPE, chard, charmedkelly, chuenmanc, cjh2007, class27, Clayton, clocks, Cloudwatcher, Colan, continuum, Coolhandjo, cootuk, Cornelius Varley, couleurblue, coxie, cpu_fan, crepitis, Dangerous-Dave, dark knight, DarkerSky, Darren B, Darth_Muppet, dave1978, Daveb3650, DaveGibbons, david o, david r, david61, Daz1969, dc509, Dean, DemonicOmelette, Demonperformer, Dendroica, Deneb, derekm, derrickf, digitaldave, Dippus, DIYASTRO, dobserver, Doc, Druid87, drummerp, durr, dweller25, Eagleseye, Edstronomy, ericsolo, essex sky, F15Rules, Fay, felix, fizzer, FJAstronomy, flarkey, flight69er, Flinthead, FLO, fmeireso, Ford Prefect, Frankenstein, frequency777, G4YVM, Gary1, gary1968, gazmass, GazOC, GeoC, Geoffrey, George, George Jones, geraldlinnett, gfletcher, Ghost66, Glasspusher, Glider, gliderpilot, glowjet, gm7pbb, Gordon G, Grant, greenkat, H2IKXF, haitch, hakama, harry page, Helen, Helge, Herakles, hoobz, hubblebubble, hunterknox, Hypernova, iamjulian, IanC11, Ibbo !, ImAgErViV, inapottingshed, insomnia, inspectapart, inter menan, Iris, irthlingboroughastronomy, IvorHogseye, jabberwock48, Jack, Jaffa007, jah79, jahmanson, Jake Bullit, James, jamesnic7, Jamie, JAO, jaquesnoir, jarbi, jarralad, Jason D, JCJC, jgs001, JimBobs63, jinstan, joe_at, johnb, Johnboy, johnh, johninderby, johnkirkpatrick, johnnyp, johnrt, JohnWC, JonH, joselin, Jove, jsjm, Jupiter Martin, Kai, kai Meyer, kamperman, keef_uk, Keith2, keithatrochdale, Kerrp30, kev 102 42, kevenh, KevG, Keyb, kniclander, knightsky, kookoo_gr, Kris77, lee g, Leegsi, legion48, lennoxlude, LeoLion, lepus, lguise, lightbucket, lunator, m.tweedy, Macavity, macipod, Macmarch, Magnum, malp, marcdearn, marco, Mark at Beaufort, mark skelton, markarian, Marmite, martin20, martintblack, martin_h, Martynb, matteboy, Matthew.Blake, mattifor, mattlane, mattrus, mba007, mdstuart, melsky, Merlin66, merlinxlm, MG1, michael.h.f.wilkinson, michaelmorris, michigander, Mick UK, mickyblueyes, MickyWay, MightyMike, mightymonoped, Mike W, mikeanders45, MikeP, Mike_F, Milliways, Miro, Mixc, mobi, moocher, moondog, Moonhawk, MoonNut, Mr Spock, MrGoatsmilk, muddy, Muddy Rutter, musherrob, Mutley, myk68, NaomiH, narrowbandpaul, Naz, nbrus, ncjunk, Neil I, neil phillips, neilf, neilmr, NeilP, ngc2403, Nick Smith, NickH, nicnac, NikonB, nobbytate, NOBUCHIKA, NoelinLiverpool, oceanheadted, old codger, Oldfort, old_eyes, ollypenrice, omega3, omneferuss, orionhunter, orions-knight, ottUp, p1taylor, Parallax, part timer, Paul G. Abel, paul mc c, paul11, PaulC-I, pauldaviesuk, PaulG, Paulus, pbyrne, pedro.re, peeceeTal2M, perrin6, Peter N, pete_gamby, phattanglo, Phil Fargaze, Philip R, philipok, philj, PhillyDee, pmesquita, ponytale, PortableAstronomer, Postie, Psychobilly, r3i, rawhead, Raws69, rblunden, rcwinter, red dwalf, Reggie, resonator77, RichardW, RichieP, rickstanners, riklaunim, RikMcRae, rikyuu, ringz, riogrande100, RME1, Rob, Robfal, RobH, robhal9000, robinb, robindurant, robinevans, roboticsound, roundycat, royholl, Rui, russ, Rusty Strings, rwg, rwilkey, samm, samtheeagle, Sarah, satnam888, saturn, Scott Tilley, ScottC, sgazer, shanefarrell, Sheffield'Stronomer, sheri_barri, Simonl, skybond, SkyDaz, skye at night, SkyExplorer, SlipperySquid, SlySi84, smen, Smooth, snowking, Solar B, solarwallace, sooty, Space Bat, Space Cowboy, spacetrace, Spence, spike87, spiritus Angelos, Sponcom, spOO, SpookyKatt, Srbin, stanlee31, starbound, StarCatcha, Stardust, Starflyer, StarGeezer, Starjumper, StarMan1701, starpusher, starscy, stefski, Steno, Stephen Green, steppenwolf, step_hen, stev74, Steve, Steve C, Steve1976, steve51450, SteveL, stevemess, stevewell, SteveWolves, steve_bham, Steve_Max127, stuartsmith01, studdedsole, stuming, sungazer, superjody, Takahashi, Talitha, TeaDwarf, Teddy, tenbyfifty, Texy, The Sailor, The Warthog, themos, TheRidgeback, TheThing, The_PSY3NTIST, tim r, tinvek, TJ, tmarkuk, toilandtrouble123, Tony.S, tooth_dr, TopHouse, tuvw074, twotter, tyke, ukgun, Uranium235, Vega, vincentnm, vlebo, waccoo, wainscottbl, watchmakerjohn, WayBig, weareborg, WebSentinel, Whippy, wingman, Wizz, Woodsey65, xboxdevil, xyz, yankeepants, yesyes, yeti monster, Yfronto, Yoddha, Zarathustra, zedds, zenofrag, zetajanus, zhgutas, {CP}-Brooker

12dstring (21)