Reported in MPEC 2012-L30, June 12 09:30 UT. http://www.minorplanetcenter.net/mpec/K12/K12L30.html
2012 LZ1 is approximately 300-700 metres in size (H=19.7) and makes its closest approach of 0.036 AU (about 14 lunar-distances) on June 15.0 UT. The object will be visible from the UK/Ireland near closest approach rather low down in a south-easterly direction and may be best seen before dawn (around 01:00-02:00 UT) on Friday, Jun 15 as an asteroidal object, magnitude 13.9 or so, moving at an apparent speed of about 38 "/min at an altitude of roughly 25 degrees above the horizon.
Unusually too, although the orbital inclination is 26 degrees, it will remain visible from the UK/Ireland on many successive nights as it moves further northwards. During the next ten days, the declination, brightness and apparent speed will be as follows:
June 14/15 Decl. -15 V=13.9 38"/min
June 15/16 Decl. +01 V=14.2 36 "/min
June 16/17 Decl. +13 V=14.6 30 "/min
June 17/18 Decl. +23 V=15.1 23 "/min
June 18/19 Decl. +31 V=15.6 18 "/min
June 19/20 Decl. +37 V=16.0 13 "/min
June 20/21 Decl. +42 V=16.4 10 "/min
June 21/22 Decl. +46 V=16.7 8 "/min
June 22/23 Decl. +49 V=17.0 7 "/min
This object will be visible in a westerly direction at an altitude of some 54 degrees.
Given its size and proximity to the Earth, 2012 LZ1 is the latest PHA discovered. Congratulations to Rob McNaught on this particular find which was conducted as part of the Siding Spring Survey; an NEO search program, the southern hemisphere counterpart of the Catalina Sky survey.
Sky co-ordinates for finding this object can be obtained from the Minor Planet Center's ephemeris service at: http://minorplanetcenter.net/iau/MPEph/MPEph.html Remember to enter a suitable Observatory Code in the online form to achieve a satisfactory topocentric prediction. For the UK, you might wish to use the Code for Greenwich namely '000'.
Observers are encouraged to report astrometry to the Minor Planet Center. Please report photometry to the nearest 0.01 mag to myself at the address below. Thank you.
Richard Miles, Director, Asteroids and Remote Planets Section, British Astronomical Association
Email: arps [at] britastro.org
3. TRANSITS OF MERCURY: (Sorry, I forgot to include the dates for these in the last bulletin). We now have two Transits of Mercury to look forward to, on 2016 May 9 @ 14.58; and 2019 Nov 11 @ 15.21 (times are for mid-transit), both all visible from Ireland.
The programme for the event has been finalised: see http://www.irishastronomy.org/index.php?option=com_kunena&func=view&catid=11&id=93657&Itemid=40#93940
Spaces are limited to 60 seats. If you are interested in attending, please send an e-mail to email@example.com. Please state in the e-mail how many seats you would like to reserve.
Regards & Thanks, Michael O'Connell
(NB: Dunsink Observatory is on Dunsink Lane, Castleknock, Dublin. The Observatory is at 53 deg 23' 14.3"N, 6 deg 20' 19.0" W, with the entrance off Dunsink Lane at 23' 16.6"N; 20' 14" W. But Dunsink Lane has been blocked on the city side, and the observatory is now only accessible from the New River Road end, off the Navan Road, near the junction of the N3 and the M50 - the Castleknock junction, Junction 6. Since the M50 upgrade this has become a very complex junction.
If approaching via the M50 from the Dublin airport direction, you MUST get into the correct lane at the offslip, or you'll be way off course! So when you approach Junction 6, move onto the offslip lane (to the left, obviously), but then stay on the two right hand lanes of the offslip, signed for 'Castleknock'. Do NOT keep on going round to your left via the left hand lane on the offslip, which will take you on to the N3 and Castleknock village! (That seems wrong when you know where Dunsink is, but believe me - I learned the hard way! If your Satnav says something else, ignore it.)
Then move into the left hand of the two 'right' offslip lanes (in other words, the middle one of the original three). This will bring you to the original big roundabout, with traffic lights, where you then keep left, and then immediately left again, signed for 'Dunsink'.
This road leads directly on to New River Road. At the 'cul-de-sac' sign continue on straight, and it becomes Dunsink Lane. Go straight on for almost 2 km (past Elmgreen Golf Course) until you see the road blocked ahead of you: the entrance to the Observatory is on the right just before the block.
If you go this way, it's simple and easy, so don't be put off - just follow those directions exactly.
On the return journey you go back along Dunsink Lane, then follow signs for the M50 Northbound. (TM)
8. TWITTER: the IAA now has a twitter account: @IaaAstro