XO-2
AXA Light Curves & Finder Charts & All-Sky Photometry

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    Comments
    Basic data
    List of observations
    Transit LCs
    Out-of-transit LCs
    All-sky photometry
    Finder image

Basic data

    RA = 07:48:06.5, Decl = +50:13:33
    Season = Jan 16
    B = 12.00 ± 0.03, V = 11.18 ± 0.035, Rc = 10.69 ± 0.025, Ic = 10.32 ± 0.025, B-V = 0.82 ± 0.05 (B. Gary, all-sky)
    HJDo = 4147.74902
    P = 2.615857 days (although a better value might be 2.6158605 hr)
    Depth = 14.2 ± 0.5 mmag (R-band)
    Length = 2.68 ± 0.03 hr

Comments

    Timing of transits are well-behaved, so far.
    OOT LCs show nothing statistically significant, so far.
   
   





List of observations


Date [yyyy.mm.dd]
 Filter
 Observer
 Depth [mmag]
 Length [hr]
 UT mid
 JD mid
 HJD mid
 HJD ephem
 dt [min]
25
 2008.03.20
 C
 Haarup
 18.2 ± 1.5
 2.33 ± 0.16
 20.694 ± 0.082
 4545.3622
 4545.3641 ± 0.0034
 4545.3593
 +6.9 ± 4.9
24
 2008.02.14
 C
 Haarup
 14.5 ± 0.5
 n/a
 20.369 ± 0.057
 4511.3487
 4511.3527 ± 0.0024
 4511.3531
 -0.6 ± 3.4
23
 2008.02.08
 R
 Mendez
 13.8 ± 1.4 2.70 ± 0.16 00.029 ± 0.081 4503.5012
 4503.5056 ± 0.0033 4503.5056
 +0.0 ± 4.9
22
 2008.02.08
 C
 Staels
 13.5 ± 0.6
 2.55 ± 0.07
 00.014 ± 0.035
 4503.5006
 4503.5049 ± 0.0015
 4503.5056
 0.9 ± 2.1
21
 2008.02.01
 C
 Staels
 13.8 ± 1.5 na
 18.490 ± 0.080 4498.2704
 4498.2750 ± 0.0033 4498.2739
 +1.6 ± 4.9
20
 2008.01.24
 V
 Marchini +
 14.5 ± 1.0 2.58 ± 0.13 22.160 ± 0.064 4490.4213
 4490.4260 ± 0.0027 4490.4263
 -0.4 ± 3.8
19
 2008.01.24
 C
 Staels
 15.7 ± 0.8 2.81 ± 0.06 22.160 ± 0.032 4490.4233
 4490.4281 ± 0.0013 4490.4263
 +2.6 ± 1.9
18
 2007.12.27
 C
 Naves
 13.7 ± 0.5
 2.74 ± 0.07
 03.530 ± 0.036
 4461.6471
 4461.6519 ± 0.0029
 4461.6519
 +0.0 ± 2.6
17
 2007.12.27
 I
 Gary
 11.8 ± 1.4
 2.84 ± 0.09
 03.510 ± 0.043
 4461.6463
 4461.6510 ± 0.0018
 4461.6471
 -1.2 ± 2.6
16
 2007.12.24
 BB
 Gary
 14.0 ± 1.0 ?
 12.760 ± 0.050 4459.0317
 4459.0364 ± 0.0021 4459.0360
 +0.5 ± 3.1
15
 2007.12.19
 BB
 Gary
 13.7 ± 0.4 2.73 ± 0.06 07.215 ± 0.028 4453.8006
 4453.8052 ± 0.0012 4453.8043
 +1.3 ± 1.7
14
 2007.11.17 C
 Staels
 14.5 ± 0.8
 2.61 ± 0.09
 21.875 ± 0.045
 4422.4115
 4422.4144 ± 0.0019
 4422.4140
 +0.6 ± 2.7
13
 2007.11.17
 C
 Naves
 14.0 ± 1.0
 2.66 ± 0.07
 21.785 ± 0.032 4422.4077
 4422.4106 ± 0.0030
 4422.4140
 -4.9 ± 2.0
12
 2007.11.11
 R
 Gregorio
 14.2 ± 1.3
 2.56 ± 0.07 25.598 ± 0.071 4414.5666
 4414.5689 ± 0.0030 4414.5664
 +3.8 ± 4.2
11
 2007.04.12
 R
 Gary
 12 ± 3 n/a
 n/a
 n/a
 n/a

10
 2007.04.06
 R
 Vanmunster
 14.2 ± 1 n/a
 n/a
 n/a
 n/a

9
 2007.03.11
 R
 Vanmunster
 15 ± 2 n/a
 n/a
 n/a
 n/a

8
 2007.03.09
 R
 Foote
 14.0 ± 0.4
 2.71 ± 0.05
 04.243 ± 0.025
 4168.6768
 4168.6794 ± 0.0010
 4168.6759
 +5.1 ± 1.5
7
 2007.03.09
 C
 Foote
 15.3 ± 0.4
 2.60 ± 0.04
 04.218 ± 0.019
 4168.6757
 4168.6784 ± 0.0008
 4168.6759
 +3.6 ± 1.1
6
 2007.03.09
 R
 Gary
 14.8 ± 1.0 2.75 ± 0.10 04.15 ± 0.015 4168.6729
 4168.6756 ± 0.0006 4168.6759
 -0.5 ± 0.9
5
 2007.03.01
 V
 Gary
 14.5 ± 1.0 2.68 ± 0.08 07.775 ± 0.08 4160.8240
 4160.8271 ± 0.0033 4160.8283
 -1.7 ± 4.8
4
 2007.02.16
 C
 Gary
 14.6 ± 1.0 2.68 ± 0.08 05.875 ± 0.08 4147.7452
 4147.7492 ± 0.0033 4147.7490
 -0.4 ± 4.8
3
 2007.02.03
 B
 Gary/Healy
 17 ± 1 2.6 ± 0.1 04.00 ± 0.10 4134.6667
 4134.6712 ± 0.0042 4134.6697
 +2.1 ± 6.0
2
 2007.02.03
 I
 Gary
 14 ± 2 3.1 ± 0.2 03.85 ± 0.10 4134.6604
 4134.6650 ± 0.0042 4134.6697
 -6.9 ± 6.0
1
 2007.01.21
 B
 Gary
 18 ± 2 n/a
 n/a
 n/a
 n/a

Light Curves











Excellent! This is the best amateur LC that I've ever seen! Notice the abrupt ingress and egress changes and the strong limb darkening shape.




First submission by this group (Barbieri, Borsi, Conti, Marchini & Marchini). Good job considering full moon and V-band.


First submission by Staels; great quality LC!


Perfect agreement with consensus!


High air mass at beginning, poor seeing & wind at end that terminated obsns.


Unusually flat OOT for BB-filter.








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Note: The ingress/egress ticks on the following plots are at the wrong times; this will eventually be fixed.









 
 








 






Out-of-Transit (OOT)


Before ingress.





Finder Image


FOV = 25.5 x 18.7 'arc. XO-2 is indicated. It's same color binary companion is 31 "arc to the south and is 0.08 mag brighter. The companion is an ideal reference star since it's close-by, same brightness and same color.



All-Sky Photometry


Beware of Star #10 which is a small-amplitude, short-period variable (30 mmag amplitude, 1 hour period). Don't use it as a reference star. 



"Comp" is the star 31"arc to the south.



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WebMaster: Bruce L. Gary. Nothing on this web page is copyrighted. This site opened:  July 04, 2007.  Last Update:  May 08, 2008