Comet C/2009 Y1 (Catalina) makes its closest approach to the Earth (2.327 AU) on the 16th August, 2011.
Ephemeris
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag 2011 08 15 23 19 38.6 -11 16 55 2.3273 3.2714 154.6 7.6 16.0 2011 08 16 23 18 17.1 -11 44 29 2.3269 3.2778 156.0 7.2 16.0 2011 08 17 23 16 54.7 -12 12 04 2.3270 3.2843 157.3 6.8 16.0 2011 08 18 23 15 31.4 -12 39 38 2.3276 3.2907 158.5 6.5 16.0 2011 08 19 23 14 07.2 -13 07 10 2.3287 3.2972 159.8 6.1 16.0 2011 08 20 23 12 42.1 -13 34 39 2.3302 3.3037 161.0 5.7 16.0 2011 08 21 23 11 16.4 -14 02 03 2.3322 3.3102 162.2 5.4 16.0 2011 08 22 23 09 49.9 -14 29 22 2.3347 3.3167 163.4 5.0 16.0 2011 08 23 23 08 22.8 -14 56 34 2.3377 3.3232 164.5 4.7 16.1 2011 08 24 23 06 55.0 -15 23 39 2.3411 3.3298 165.5 4.4 16.1 2011 08 25 23 05 26.8 -15 50 35 2.3451 3.3363 166.4 4.1 16.1 2011 08 26 23 03 58.1 -16 17 21 2.3495 3.3429 167.3 3.8 16.1 2011 08 27 23 02 29.0 -16 43 56 2.3544 3.3495 168.0 3.6 16.1 2011 08 28 23 00 59.6 -17 10 19 2.3598 3.3561 168.6 3.4 16.1 2011 08 29 22 59 29.8 -17 36 29 2.3657 3.3627 168.9 3.3 16.1 2011 08 30 22 57 59.9 -18 02 25 2.3721 3.3693 169.1 3.2 16.2 2011 08 31 22 56 29.9 -18 28 06 2.3790 3.3759 169.1 3.2 16.2
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag 2011 01 19 21 33 41.9 +31 33 46 2.9288 2.5228 56.5 19.0 15.42011 01 20 21 35 28.8 +31 15 34 2.9405 2.5223 55.8 18.8 15.42011 01 21 21 37 14.6 +30 57 39 2.9522 2.5220 55.1 18.7 15.42011 01 22 21 38 59.6 +30 40 03 2.9639 2.5216 54.4 18.5 15.42011 01 23 21 40 43.5 +30 22 44 2.9756 2.5213 53.7 18.3 15.42011 01 24 21 42 26.6 +30 05 43 2.9873 2.5211 53.0 18.2 15.42011 01 25 21 44 08.8 +29 48 59 2.9989 2.5209 52.3 18.0 15.42011 01 26 21 45 50.2 +29 32 33 3.0105 2.5207 51.6 17.8 15.42011 01 27 21 47 30.6 +29 16 23 3.0221 2.5206 51.0 17.7 15.42011 01 28 21 49 10.2 +29 00 30 3.0336 2.5205 50.3 17.5 15.42011 01 29 21 50 49.0 +28 44 54 3.0451 2.5205 49.6 17.3 15.42011 01 30 21 52 27.0 +28 29 34 3.0564 2.5205 48.9 17.1 15.42011 01 31 21 54 04.2 +28 14 31 3.0678 2.5206 48.2 16.9 15.42011 02 01 21 55 40.6 +27 59 43 3.0790 2.5207 47.5 16.8 15.5
Orbital elements: C/2009 Y1 (Catalina)Epoch 2011 Feb. 8.0 TT = JDT 2455600.5T 2011 Jan. 28.93589 TT MPCq 2.5202177 (2000.0) P Qz +0.0027343 Peri. 127.40173 +0.65155765 +0.68677448 +/-0.0000849 Node 160.27563 -0.28555444 -0.17145153e 0.9931090 Incl. 107.31521 +0.70280245 -0.70636053
Orbital elements: C/2009 Y1 (Catalina)T 2011 Jan. 27.7430 TT MPCq 2.526694 (2000.0) P Q Peri. 127.1160 +0.6483019 +0.6902720 Node 160.3286 -0.2835701 -0.1727239e 1.0 Incl. 107.3591 +0.7066064 -0.7026315From 83 observations 2009 Dec. 17-2010 Jan. 25.
Orbital elements: C/2009 Y1 (Catalina)T 2011 Jan. 27.705 TT MPCq 2.52579 (2000.0) P Q Peri. 127.132 +0.648475 +0.690067 Node 160.323 -0.283732 -0.172659e 1.0 Incl. 107.355 +0.706383 -0.702848From 63 observations 2009 Dec. 17-2010 Jan. 19.
Orbital elements: C/2009 Y1 (Catalina)T 2011 Jan. 27.663 TT MPCq 2.52418 (2000.0) P Q Peri. 127.165 +0.648875 +0.689685 Node 160.322 -0.283834 -0.172511e 1.0 Incl. 107.355 +0.705975 -0.703260From 55 observations 2009 Dec. 17-2010 Jan. 12.
Orbital elements: C/2009 Y1 (Catalina)T 2011 Jan. 28.283 TT MPCq 2.55149 (2000.0) P Q Peri. 126.581 +0.641565 +0.696220 Node 160.292 -0.283154 -0.175160e 1.0 Incl. 107.296 +0.712894 -0.696130From 49 observations 2009 Dec. 17-29.
C/2009 Y1 (Catalina)T 2011 Jan. 27.935 TT MPCq 2.53705 (2000.0) P Q Peri. 126.887 +0.645396 +0.692797 Node 160.306 -0.283550 -0.173781e 1.0 Incl. 107.326 +0.709270 -0.699880From 44 observations 2009 Dec. 17-29.