Recent Discoveries – Sept 28 – Oct 1

With the start of the current lunation, the surveys kicked into high gear. Recent discoveries include:

2010 OC127 – This object was first seen by the La Sagra Survey, a Spanish amateur asteroid survey, on July 31. At the time its motion was very boring so it was assumed to be a routine Main Belt asteroid. On Sept 27, the Siding Spring Survey reobserved the asteroid and this time its motion was indicative of a NEA. Follow-up observations confirmed the object as the same as La Sagra’s July 31 find and as an NEA.

2010 SK13 – A small asteroid (diameter of 7 – 20 meters) which passed within 0.0018 AU (167,000 miles or 267,000 km or 0.7 lunar distances) from Earth on Sept 30. It was discovered the night before closest approach. It reached magnitude 16.0  at its brightest.

Follow up on recently discovered comet C/2010 S1 (LINEAR) (see the previous post):

Additional follow-up observations have allowed an improved orbit to be determined for this object. Rather then reaching perihelion at a distance of 4.41 AU from the Sun, the new orbit shows perihelion at a distance of 5.80 AU. Time of perihelion remains in May of 2013. Even with the larger perihelion distance, this comet should reach magnitude 14-15 in the summer of 2013.

Asteroid    Type     MOID     a     e     i     H  Mag  Discoverer      MPEC
2010 ST16   Apollo  0.090   2.69  0.62   6.5  23.6  21  Mount Lemmon    2010-T04
2010 SS16   Amor    0.132   2.77  0.59   0.9  23.1  21  Mount Lemmon    2010-T03
2010 SR16   Apollo  0.052   1.35  0.30  27.4  24.1  18  Catalina        2010-T02
2010 SO16   Apollo  0.027   1.00  0.08  14.5  20.9  20  WISE            2010-S72
2010 SV15   Apollo  0.036   1.32  0.27  11.8  26.7  20  Mount Lemmon    2010-S71
2010 SU15   Amor    0.079   3.21  0.66   5.4  25.7  20  Mount Lemmon    2010-S70
2010 SL15   Amor    0.117   2.73  0.59   0.9  24.8  21  Mount Lemmon    2010-S69
2010 SK15   Amor    0.049   2.37  0.56   4.8  22.4  17  LINEAR          2010-S68
2010 SJ15   Apollo  0.114   1.37  0.48  33.9  22.7  21  Mount Lemmon    2010-S67
2010 SH15   Apollo  0.045   1.19  0.15   4.3  22.4  21  Mount Lemmon    2010-S66
2010 SG15   Amor    0.087   2.08  0.48   0.8  24.8  20  Mount Lemmon    2010-S65
2010 SF15   Amor    0.078   2.02  0.47   3.0  21.2  20  Mount Lemmon    2010-S64
2010 SL13   Amor    0.195   2.03  0.42   3.1  19.3  20  Spacewatch      2010-S62
2010 SK13   Apollo  0.002   2.42  0.71   1.3  27.4  19  Spacewatch      2010-S61
2010 SJ13   Apollo  0.107   1.70  0.59   7.7  21.2  19  LINEAR          2010-S60
2010 SH13   Amor    0.041   1.21  0.14  14.0  21.9  20  Spacewatch      2010-S59
2010 SG13   Apollo  0.085   1.16  0.69  31.3  18.5  20  Spacewatch      2010-S58
2010 SD13   Amor    0.125   2.71  0.60  10.7  18.7  18  Siding Spring   2010-S52
2010 OC127  Amor    0.257   2.42  0.49   7.0  19.2  18  La Sagra        2010-S57

Comet       Type       T        q     a     e     i  Mag  Period        MPEC 
None

Type
Aten -  Earth crossing with semi-major axis (avg distance from Sun) < 1 AU
Apollo - Earth crossing with semi-major axis (avg distance from Sun) > 1 AU
Amor - non-Earth crossing with perihelion distance < 1.3 AU
JFC - Jupiter family comet
HFC - Halley family comet
LPC - Long-period comet
MBC - Main belt comet
ECC - Suspected extinct or dormant (or just unrecognized) comet
T - Date of Perihelion
MOID - Minimum Orbit Intercept Distance, minimum distance between asteroid and Earth's orbit
a - semi-major axis, average distance from Sun in AU (1 AU = 93 million miles)
e - eccentricity
i - inclination
H - absolute magnitude
Mag - magnitude at discovery
Discoverer - survey or person who discovered the object
MPEC - Minor Planet Electronic Circular, the discovery announcement
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