* Astronomy

Blobrana · L

Comet 176P/LINEAR

Blobrana · L

Comet 176P/(118401) LINEAR (1999 RE70) is at Opposition (2.503 AU) in the constellation Ophiuchus on the 2nd June 2015

Blobrana · L

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 06 01    16 37 46.1 -22 25 37   2.5046  3.5184   178.9     0.3
2015 06 02    16 36 56.9 -22 24 00   2.5029  3.5170   179.7     0.1
2015 06 03    16 36 07.6 -22 22 23   2.5015  3.5155   178.7     0.4
2015 06 04    16 35 18.3 -22 20 45   2.5004  3.5141   177.6     0.7
2015 06 05    16 34 29.0 -22 19 05   2.4995  3.5126   176.4     1.0
2015 06 06    16 33 39.9 -22 17 25   2.4990  3.5112   175.3     1.4
2015 06 07    16 32 50.9 -22 15 43   2.4987  3.5097   174.2     1.7
2015 06 08    16 32 02.0 -22 14 01   2.4987  3.5083   173.0     2.0
2015 06 09    16 31 13.4 -22 12 19   2.4991  3.5068   171.9     2.3
2015 06 10    16 30 25.0 -22 10 36   2.4997  3.5054   170.7     2.7
2015 06 11    16 29 37.0 -22 08 52   2.5006  3.5039   169.6     3.0
2015 06 12    16 28 49.2 -22 07 09   2.5017  3.5024   168.4     3.3
2015 06 13    16 28 01.9 -22 05 25   2.5032  3.5010   167.3     3.7
2015 06 14    16 27 15.0 -22 03 41   2.5049  3.4995   166.2     4.0
2015 06 15    16 26 28.6 -22 01 57   2.5070  3.4980   165.0     4.3
2015 06 16    16 25 42.8 -22 00 13   2.5093  3.4966   163.9     4.6
2015 06 17    16 24 57.4 -21 58 29   2.5119  3.4951   162.7     4.9
2015 06 18    16 24 12.7 -21 56 46   2.5147  3.4936   161.6     5.3
2015 06 19    16 23 28.6 -21 55 04   2.5178  3.4921   160.5     5.6
2015 06 20    16 22 45.3 -21 53 22   2.5212  3.4906   159.4     5.9
2015 06 21    16 22 02.6 -21 51 41   2.5249  3.4891   158.2     6.2
2015 06 22    16 21 20.7 -21 50 00   2.5288  3.4876   157.1     6.5
2015 06 23    16 20 39.5 -21 48 21   2.5330  3.4861   156.0     6.8
2015 06 24    16 19 59.2 -21 46 43   2.5375  3.4846   154.9     7.1
2015 06 25    16 19 19.7 -21 45 07   2.5422  3.4831   153.8     7.4
2015 06 26    16 18 41.2 -21 43 31   2.5471  3.4816   152.7     7.7
2015 06 27    16 18 03.5 -21 41 57   2.5523  3.4801   151.6     8.0
2015 06 28    16 17 26.7 -21 40 25   2.5578  3.4786   150.5     8.3
2015 06 29    16 16 51.0 -21 38 55   2.5634  3.4771   149.4     8.6
2015 06 30    16 16 16.2 -21 37 26   2.5694  3.4756   148.3     8.8

Blobrana · L

Title: Search for the Return of Activity in Active Asteroid 176P/LINEAR
Author: Henry H. Hsieh, Larry Denneau, Alan Fitzsimmons, Olivier R. Hainaut, Masateru Ishiguro, Robert Jedicke, Heather M. Kaluna, Jacqueline V. Keane, Jan Kleyna, Pedro Lacerda, Eric M. MacLennan, Karen J. Meech, Nick A. Moskovitz, Timm Riesen, Eva Schunova, Colin Snodgrass, Chadwick A. Trujillo, Laurie Urban, Peter Veres, Richard J. Wainscoat, Bin Yang

We present the results of a search for the reactivation of active asteroid 176P/LINEAR during its 2011 perihelion passage using deep optical observations obtained before, during, and after that perihelion passage. Deep composite images of 176P constructed from data obtained between June 2011 and December 2011 show no visible signs of activity, while photometric measurements of the object during this period also show no significant brightness enhancements similar to that observed for 176P between November 2005 and December 2005 when it was previously observed to be active. An azimuthal search for dust emission likewise reveals no evidence for directed emission (i.e., a tail, as was previously observed for 176P), while a one-dimensional surface brightness profile analysis shows no indication of a spherically symmetric coma at any time in 2011. We conclude that 176P did not in fact exhibit activity in 2011, at least not on the level on which it exhibited activity in 2005, and suggest that this could be due to the devolatisation or mantling of the active site responsible for its activity in 2005.

Read more (8376kb, PDF)

Blobrana · L

Comet 176P/LINEAR is at Opposition (2.808 AU) on the 8th April 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 04 07    13 08 23.6 -07 26 53   2.8081  3.8086   178.3     0.4
2014 04 08    13 07 41.3 -07 22 37   2.8076  3.8087   179.4     0.1
2014 04 09    13 06 59.0 -07 18 20   2.8075  3.8088   179.3     0.2
2014 04 10    13 06 16.7 -07 14 03   2.8076  3.8089   178.2     0.5
2014 04 11    13 05 34.5 -07 09 46   2.8081  3.8090   177.0     0.8
2014 04 12    13 04 52.3 -07 05 29   2.8088  3.8091   175.8     1.1
2014 04 13    13 04 10.4 -07 01 12   2.8099  3.8092   174.7     1.4
2014 04 14    13 03 28.6 -06 56 56   2.8112  3.8093   173.5     1.7
2014 04 15    13 02 47.0 -06 52 42   2.8129  3.8094   172.3     2.0
2014 04 16    13 02 05.6 -06 48 28   2.8148  3.8095   171.2     2.3
2014 04 17    13 01 24.6 -06 44 16   2.8171  3.8095   170.0     2.6
2014 04 18    13 00 43.8 -06 40 05   2.8196  3.8096   168.9     2.9
2014 04 19    13 00 03.4 -06 35 56   2.8225  3.8097   167.7     3.2
2014 04 20    12 59 23.3 -06 31 49   2.8256  3.8097   166.5     3.5
2014 04 21    12 58 43.7 -06 27 44   2.8291  3.8098   165.4     3.8
2014 04 22    12 58 04.4 -06 23 41   2.8328  3.8099   164.2     4.1
2014 04 23    12 57 25.7 -06 19 41   2.8368  3.8099   163.1     4.4
2014 04 24    12 56 47.4 -06 15 44   2.8411  3.8100   161.9     4.7
2014 04 25    12 56 09.7 -06 11 49   2.8457  3.8100   160.8     5.0
2014 04 26    12 55 32.5 -06 07 58   2.8505  3.8100   159.7     5.3
2014 04 27    12 54 55.9 -06 04 10   2.8557  3.8101   158.5     5.6
2014 04 28    12 54 19.9 -06 00 26   2.8611  3.8101   157.4     5.8
2014 04 29    12 53 44.5 -05 56 46   2.8668  3.8101   156.3     6.1
2014 04 30    12 53 09.8 -05 53 09   2.8727  3.8102   155.1     6.4

Blobrana · L

Comet 176P/LINEAR makes its closest approach to the Earth (2.444 AU) on the 9th February, 2013.

Blobrana · L

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2013 02 08    09 51 36.1 +13 06 24   2.4440  3.4261   173.6     1.8
2013 02 09    09 50 49.3 +13 10 25   2.4439  3.4277   174.8     1.5
2013 02 10    09 50 02.4 +13 14 27   2.4441  3.4293   176.0     1.1
2013 02 11    09 49 15.3 +13 18 29   2.4447  3.4309   177.2     0.8
2013 02 12    09 48 28.2 +13 22 30   2.4456  3.4325   178.5     0.4
2013 02 13    09 47 41.0 +13 26 30   2.4467  3.4341   179.7     0.1
2013 02 14    09 46 53.9 +13 30 30   2.4482  3.4357   179.1     0.3
2013 02 15    09 46 06.8 +13 34 29   2.4500  3.4373   177.9     0.6
2013 02 16    09 45 19.8 +13 38 26   2.4521  3.4389   176.7     1.0
2013 02 17    09 44 33.0 +13 42 22   2.4545  3.4405   175.5     1.3
2013 02 18    09 43 46.4 +13 46 16   2.4572  3.4420   174.3     1.6
2013 02 19    09 43 00.0 +13 50 08   2.4602  3.4436   173.1     2.0
2013 02 20    09 42 14.0 +13 53 57   2.4636  3.4452   171.9     2.3

Blobrana · L

Comet 176P/LINEAR is at Perihelion (2.576 AU) on the 30th June, 2011.

Blobrana · L

Comet 176P/LINEAR makes its closest approach to the Earth (1.955 AU) on the 1st August, 2010.

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2010 08 01    20 12 18.5 -20 13 05   1.9552  2.9642   172.3     2.6        19.1
2010 08 02    20 11 29.6 -20 15 34   1.9554  2.9623   171.1     3.0        19.1
2010 08 03    20 10 41.0 -20 18 01   1.9559  2.9605   170.0     3.4        19.1
2010 08 04    20 09 52.7 -20 20 25   1.9566  2.9586   168.8     3.8        19.2
2010 08 05    20 09 04.8 -20 22 48   1.9577  2.9567   167.7     4.2        19.2