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TABLE 1 |
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Observed Astrometric Positions for the Haumea System
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Julian Date |
Date |
Telescope |
Camera |
∆xH
(arcsec) |
∆yH
(arcsec) |
σ∆xH
(arcsec) |
σ∆ yH
(arcsec) |
∆xN
|
∆yN
|
σ∆ xN
|
σ∆yN
|
|
2453397.162 |
2005 Jan 26 |
Keck |
NIRC2 |
0.03506 |
-0.63055 |
0.01394 |
0.01394 |
··· |
··· |
··· |
··· |
|
2453431.009 |
2005 Mar 1 |
Keck |
NIRC2 |
0.29390 |
-1.00626 |
0.02291 |
0.02291 |
0.00992 |
0.52801 |
0.02986 |
0.02986 |
|
2453433.984 |
2005 Mar 4 |
Keck |
NIRC2 |
0.33974 |
-1.26530 |
0.01992 |
0.01992 |
··· |
··· |
··· |
··· |
|
2453518.816 |
2005 May 28 |
Keck |
NIRC2 |
-0.06226 |
0.60575 |
0.00996 |
0.00996 |
··· |
··· |
··· |
··· |
|
2453551.810 |
2005 Jun 30 |
Keck |
NIRC2 |
-0.19727 |
0.52106 |
0.00498 |
0.00996 |
-0.03988 |
-0.65739 |
0.03978 |
0.03978 |
|
2453746.525 |
2006 Jan 11 |
HST |
ACS/HRC |
-0.20637 |
0.30013 |
0.00256 |
0.00256 |
0.04134 |
-0.18746 |
0.00267 |
0.00267 |
|
2453746.554 |
2006 Jan 11 |
HST |
ACS/HRC |
-0.20832 |
0.30582 |
0.00257 |
0.00257 |
0.03867 |
-0.19174 |
0.00267 |
0.00267 |
|
2454138.287 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21088 |
0.22019 |
0.00252 |
0.00197 |
-0.02627 |
-0.57004 |
0.00702 |
0.00351 |
|
2454138.304 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21132 |
0.22145 |
0.00095 |
0.00204 |
-0.03107 |
-0.56624 |
0.00210 |
0.00782 |
|
2454138.351 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21515 |
0.23185 |
0.00301 |
0.00206 |
-0.03009 |
-0.55811 |
0.00527 |
0.00564 |
|
2454138.368 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21402 |
0.23314 |
0.00192 |
0.00230 |
-0.03133 |
-0.56000 |
0.00482 |
0.00663 |
|
2454138.418 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21705 |
0.24202 |
0.00103 |
0.00282 |
-0.03134 |
-0.54559 |
0.00385 |
0.00376 |
|
2454138.435 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21449 |
0.24450 |
0.00323 |
0.00254 |
-0.02791 |
-0.54794 |
0.00571 |
0.00524 |
|
2454138.484 |
2007 Feb 6 |
HST |
WFPC2 |
-0.21818 |
0.25301 |
0.00153 |
0.00224 |
-0.02972 |
-0.53385 |
0.00797 |
0.01330 |
|
2454138.501 |
2007 Feb 7 |
HST |
WFPC2 |
-0.21807 |
0.25639 |
0.00310 |
0.00291 |
-0.03226 |
-0.53727 |
0.00531 |
0.00400 |
|
2454138.551 |
2007 Feb 7 |
HST |
WFPC2 |
-0.22173 |
0.26308 |
0.00146 |
0.00230 |
-0.03429 |
-0.53079 |
0.00497 |
0.00582 |
|
2454138.567 |
2007 Feb 7 |
HST |
WFPC2 |
-0.21978 |
0.26791 |
0.00202 |
0.00226 |
-0.03576 |
-0.52712 |
0.00270 |
0.00479 |
|
2454469.653 |
2008 Jan 4 |
HST |
WFPC2 |
0.23786 |
-1.27383 |
0.00404 |
0.00824 |
-0.02399 |
-0.28555 |
0.00670 |
0.00831 |
|
2454552.897 |
2008 Mar 27 |
Keck |
NIRC2 |
0.19974 |
-0.10941 |
0.00930 |
0.00956 |
··· |
··· |
··· |
··· |
|
2454556.929 |
2008 Mar 31 |
Keck |
NIRC2 |
0.32988 |
-0.77111 |
0.00455 |
0.00557 |
0.00439 |
-0.76848 |
0.01239 |
0.01280 |
|
2454556.948 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33367 |
-0.77427 |
0.00890 |
0.00753 |
0.01363 |
-0.76500 |
0.01976 |
0.01252 |
|
2454556.964 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33267 |
-0.77874 |
0.00676 |
0.00485 |
0.00576 |
-0.77375 |
0.01212 |
0.01283 |
|
2454557.004 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33543 |
-0.78372 |
0.00404 |
0.00592 |
0.00854 |
-0.77313 |
0.01199 |
0.00897 |
|
2454557.020 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33491 |
-0.78368 |
0.00374 |
0.00473 |
0.00075 |
-0.76974 |
0.00907 |
0.01015 |
|
2454557.039 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33712 |
-0.78464 |
0.00740 |
0.00936 |
0.00988 |
-0.77084 |
0.01793 |
0.01543 |
|
2454557.058 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33549 |
-0.78692 |
0.00868 |
0.00852 |
0.01533 |
-0.76117 |
0.00765 |
0.01571 |
|
2454557.074 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33128 |
-0.78867 |
0.01431 |
0.01411 |
0.00645 |
-0.76297 |
0.01639 |
0.01390 |
|
2454557.091 |
2008 Mar 31 |
Keck |
NIRC2 |
0.33687 |
-0.79462 |
0.00803 |
0.00717 |
0.00708 |
-0.76986 |
0.01532 |
0.00787 |
|
2454593.726 |
2008 May 7 |
HST |
NICMOS |
-0.18297 |
1.08994 |
0.00354 |
0.00425 |
0.00243 |
-0.75878 |
0.00576 |
0.00761 |
|
2454600.192 |
2008 May 13 |
HST |
WFPC2 |
0.10847 |
0.17074 |
0.00508 |
0.00427 |
-0.02325 |
0.19934 |
0.00480 |
0.01161 |
|
2454601.990 |
2008 May 15 |
HST |
WFPC2 |
0.18374 |
-0.13041 |
0.00729 |
0.00504 |
-0.02293 |
0.50217 |
0.00618 |
0.00614 |
|
2454603.788 |
2008 May 17 |
HST |
WFPC2 |
0.24918 |
-0.43962 |
0.00207 |
0.00574 |
-0.01174 |
0.59613 |
0.00366 |
0.00485 |
|
2454605.788 |
2008 May 19 |
HST |
WFPC2 |
0.29818 |
-0.75412 |
0.00467 |
0.00966 |
0.00006 |
0.29915 |
0.00425 |
0.00613 |
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Note . — Summary of
observations of the astrometric positions of Hi’iaka (H) and Namaka (N)
relative to Haumea. The difference in brightness (∼6)
and orbital planes allow for a unique identification of each satellite
without possibility of confusion. The method for obtaining the astrometric
positions and errors is described in Section 2 and Brown et al. (2005). On a
few dates, the fainter Namaka was not detected because the observations were
not of sufficiently deep or Namaka was located within the PSF of Haumea.
This data is shown graphically in Figure 2 and the residuals to the fit
shown in Figure 3. For reasons described in the text, only the HST data is
used to calculate the orbital parameters, which are shown in Table 2.
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