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Comet 249P/LINEAR - ( = 2006 U1 = 2011 A4)

IAUC 8763: COMET P/2006 U1 (LINEAR) An apparently asteroidal object of 17th magnitude, discovered by LINEAR on October 19.40 has been found to be cometary by other observers. It has the short period of 4.6 years, and was at perihelion at 0.5 AU at the end of August.

Recovery of comet P/2006 U1 (LINEAR):  (IAUC 9194) COMET P/2011 A4 = P/2006 U1 (LINEAR) L. Elenin, Lyubertsy, Russia, reports his recovery of P/2006 U1 (cf. IAUC 8763) on images obtained remotely at the ISON-NM Observatory near Mayhill, NM, USA; the object is described as slightly diffuse with no visible tail. Elenin noted: On the images, the comet was off from the calculated coordinates by 9.2 arc minutes which was significant. At this moment, the comet is quickly approaching Earth, and will come within 0.775 a.u. on March 12-13, 2011. Its maximum brightness of mag. 17 will be in the first half of April. The comet’s period of revolution around the Sun is 4.63 years.

It is worth noting that Comet P/2006 U1 is a near-Earth object. The minimum distance at which its orbit crosses Earth’s orbit is 0.0526 a.u. (7.89 million km.). Taking into account its absolute magnitude M1 = 16.3, the comet could be considered a potentially hazardous object (PHO) if its MOID were less by just 0.0026 a.u.

Last updated: 2020-10-30

Photometric data obtained by use of FOCAS-II software

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

OBJECT        DATE       TIME        +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

------------  ---------- --------  -----  -----  -----  -----  -----  -----  ----  ----  ---

249P          17/01/2016 17:50:31  17.21  16.59  16.35  16.25                 6.2  17.3  B96

249P          17/01/2016 17:50:31*  0.08   0.16   0.12   0.06                   4   3.9  USN

249P          21/01/2016 17:52:44  17.26  16.58  16.32  16.20  16.19          4.8  16.6  B96

249P          21/01/2016 17:52:44*  0.11   0.17   0.15   0.10   0.08            3   3.8  USN

                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

249P          17/01/2016 17:50:31    1.19   1.12  23.16  16.57    6      4     1  0.605  B96

249P          21/01/2016 17:52:44    1.25   1.18  22.11  16.62    5      5     1  0.667  B96