[Iaude] MPEC U183: A/2017 U1

mpec at mpcdb1.cfa.harvard.edu mpec at mpcdb1.cfa.harvard.edu
Wed Oct 25 19:07:17 EDT 2017


M.P.E.C. 2017-U183                               Issued 2017 Oct. 25, 22:22 UT
 
     The Minor Planet Electronic Circulars contain information on unusual
         minor planets and routine data on comets.  They are published
    on behalf of Division F of the International Astronomical Union by the
          Minor Planet Center, Smithsonian Astrophysical Observatory,
                          Cambridge, MA 02138, U.S.A.

             Prepared using the Tamkin Foundation Computer Network

                              MPC at CFA.HARVARD.EDU
            URL http://www.minorplanetcenter.net/    ISSN 1523-6714


                                   A/2017 U1

     K. Meech (Institute of Astronomy, University of Hawaii) reports that in a
very deep stacked image, obtained with the VLT, this object appears completely
stellar.  The prefix for the designation 2017 U1 is therefore being changed to
A/, in line with the 1995 IAU Resolution on the system of comet designations.
 
Observations:
    AK17U010  C2017 10 18.47298 01 59 57.442+02 06 04.30         19.8 wLEU183F51
    AK17U010  C2017 10 18.49990 01 59 08.910+02 07 20.19               LEU183F51
    AK17U010  C2017 10 19.39715 01 34 55.362+02 45 03.20         19.9 wLEU183F51
    AK17U010  C2017 10 19.40837 01 34 38.745+02 45 28.24         19.9 wLEU183F51
    AK17U010  C2017 10 19.41968 01 34 21.948+02 45 53.55         20.1 wLEU183F51
    AK17U010  C2017 10 19.43106 01 34 05.174+02 46 18.89         20.1 wLEU183F51
    AK17U010 KC2017 10 19.86072 01 24 07.89 +03 01 07.5          19.6 RUEU183104
    AK17U010 KC2017 10 19.86492 01 24 02.21 +03 01 16.3          19.8 RUEU183104
    AK17U010 KC2017 10 19.86905 01 23 56.69 +03 01 24.7          20.3 RUEU183104
    AK17U010 KC2017 10 19.94093401 22 22.288+03 03 53.76         20.3 GUEU183J04
    AK17U010 KC2017 10 19.94390101 22 18.372+03 03 59.57         20.1 GUEU183J04
    AK17U010  C2017 10 20.17250 01 17 27.47 +03 11 07.8          19.9 GUEU183I52
    AK17U010  C2017 10 20.17348 01 17 26.22 +03 11 09.6          20.2 GUEU183I52
    AK17U010  C2017 10 20.17448 01 17 24.96 +03 11 11.3          20.2 GUEU183I52
    AK17U010  C2017 10 20.17546 01 17 23.73 +03 11 13.0          20.6 GUEU183I52
    AK17U010 KC2017 10 21.22371 00 57 56.30 +03 39 16.9          20.2 RoEU183291
    AK17U010 KC2017 10 21.22623 00 57 53.76 +03 39 20.5          19.5 RoEU183291
    AK17U010 KC2017 10 21.22877 00 57 51.19 +03 39 24.2          19.6 RoEU183291
    AK17U010  C2017 10 21.37476 00 55 26.71 +03 42 45.0          20.4 RoEU183926
    AK17U010  C2017 10 21.37804 00 55 23.53 +03 42 49.8          20.1 RoEU183926
    AK17U010  C2017 10 21.38132 00 55 20.35 +03 42 53.7          20.4 RoEU183926
    AK17U010 |C2017 10 22.29708 00 41 56.27 +04 01 25.0                vEU183H06
    AK17U010 |C2017 10 22.30118 00 41 52.93 +04 01 29.3                vEU183H06
    AK17U010 |C2017 10 22.30512 00 41 49.76 +04 01 33.5          20.7 wvEU183H06
    AK17U010 1C2017 10 22.46548 00 39 44.84 +04 04 55.4                 EU183Q62
    AK17U010 1C2017 10 22.47027 00 39 41.16 +04 04 59.9                 EU183Q62
    AK17U010 1C2017 10 22.47506 00 39 37.39 +04 05 04.8          19.9 w EU183Q62
    AK17U010 KC2017 10 23.18830 00 31 01.55 +04 16 02.6          20.4 RqEU183734
    AK17U010 KC2017 10 23.19547 00 30 56.65 +04 16 08.7          20.1 RqEU183734
    AK17U010 KC2017 10 23.20264 00 30 51.76 +04 16 14.6          20.4 RqEU183734
    AK17U010  C2017 10 24.23395 00 20 19.64 +04 30 08.4          20.9 GUEU183G96
    AK17U010  C2017 10 24.23917 00 20 16.75 +04 30 12.3                UEU183G96
    AK17U010  C2017 10 24.24438 00 20 13.82 +04 30 15.6          21.0 GUEU183G96
    AK17U010  C2017 10 24.24957 00 20 10.85 +04 30 19.7          20.7 GUEU183G96
    AK17U010  C2017 10 25.19587 00 12 06.02 +04 40 47.9          21.3 RoEU183926
    AK17U010  C2017 10 25.20769 00 12 00.38 +04 40 55.9          21.2 RoEU183926
    AK17U010  C2017 10 25.21951 00 11 54.70 +04 41 02.0          21.4 RoEU183926
    AK17U010  C2017 10 25.24174 00 11 44.09 +04 41 15.9                UEU183G96
    AK17U010  C2017 10 25.24440 00 11 42.76 +04 41 17.8          21.7 GUEU183G96
    AK17U010  C2017 10 25.24719 00 11 41.39 +04 41 20.5          22.0 GUEU183G96
    AK17U010  C2017 10 25.25007 00 11 39.91 +04 41 23.5                UEU183G96
 
Observer details:
104 San Marcello Pistoiese.  Observers P. Bacci, M. Maestripieri.  Measurers
    P. Bacci, L. Tesi, G. Fagioli.  0.60-m f/4 reflector + CCD.
291 LPL/Spacewatch II.  Observer R. A. Mastaler.  1.8-m f/2.7 reflector + CCD.
734 Farpoint Observatory.  Observer G. Hug.  0.69-m reflector + CCD.
926 Tenagra II Observatory.  Observers M. Schwartz, P. R. Holvorcem.  Measurer
    M. Schwartz.  0.81-m f/7 Ritchey-Chretien + CCD.
F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, A. Schultz,
    M. Willman.  Measurers K. Chambers, S. Chastel, L. Denneau, H. Flewelling,
    M. Huber, E. Lilly, E. Magnier, R. Wainscoat, C. Waters, R. Weryk.  1.8-m
    Ritchey-Chretien + CCD.
G96 Mt. Lemmon Survey.  Observer G. J. Leonard.  Measurers E. J. Christensen,
    D. C. Fuls, A. R. Gibbs, A. D. Grauer, J. A. Johnson, R. A. Kowalski,
    S. M. Larson, G. J. Leonard, R. G. Matheny, R. L. Seaman, F. C. Shelly.
    1.5-m reflector + 10K CCD.
H06 iTelescope Observatory, Mayhill.  Observer H. Sato.  0.43-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
I52 Steward Observatory, Mt. Lemmon Station.  Observer R. A. Kowalski.
    Measurers E. J. Christensen, D. C. Fuls, A. R. Gibbs, A. D. Grauer,
    J. A. Johnson, R. A. Kowalski, S. M. Larson, G. J. Leonard, R. G. Matheny,
    R. L. Seaman, F. C. Shelly.  1.0-m reflector + CCD.
J04 ESA Optical Ground Station, Tenerife.  Observer D. Abreu.  Measurers
    M. Micheli, D. Koschny, M. Busch, A. Knoefel, E. Schwab.  1.0-m f/4.4
    reflector + CCD.
Q62 iTelescope Observatory, Siding Spring.  Observer H. Sato.  0.51-m f/6.8
    astrograph + CCD + f/4.5 focal reducer.
 
Orbital elements:
    A/2017 U1
Epoch 2017 Sept. 4.0 TT = JDT 2458000.5
T 2017 Sept.  9.41719 TT                                MPCW
q   0.2515404            (2000.0)            P               Q
z  -0.7541603      Peri.  241.01670     -0.63536548     +0.68733697
 +/-0.0181483      Node    24.61531     +0.49903801     +0.71329677
e   1.1897018      Incl.  122.32770     -0.58929769     -0.13702411
>From 34 observations 2017 Oct. 18-24, mean residual 0".5.

Ephemeris:
    A/2017 U1
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   V
2017 09 25    09 48 43.3 -06 12 59   0.6925  0.5884    34.9   102.8  20.5
...
2017 10 10    07 36 11.4 -05 42 56   0.2294  0.9879    80.7    86.0  18.8
...
2017 10 18    02 14 50.4 +01 42 29   0.1968  1.1887   166.6    11.2  18.7
...
2017 10 24    00 22 33.4 +04 27 26   0.3622  1.3344   156.3    17.4  20.2
2017 10 25    00 13 40.3 +04 38 57   0.3943  1.3583   153.3    19.2  20.4
2017 10 26    00 06 10.5 +04 48 35   0.4270  1.3821   150.6    20.7  20.6
...
2017 11 01    23 38 46.8 +05 25 33   0.6318  1.5233   138.3    25.7  21.6
...
2017 11 09    23 23 45.8 +05 54 48   0.9168  1.7069   127.0    27.6  22.5
...
2017 11 24    23 16 52.8 +06 41 38   1.4693  2.0399   110.7    26.9  23.8

Gareth V. Williams           (C) Copyright 2017 MPC           M.P.E.C. 2017-U183



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