[Iaude] MPEC Y52: COMET C/2018 Y1 (Iwamoto)

Thu Dec 20 13:23:18 EST 2018

M.P.E.C. 2018-Y52                                Issued 2018 Dec. 20, 18:04 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 https://www.minorplanetcenter.net/    ISSN 1523-6714


                           COMET C/2018 Y1 (Iwamoto)

     I. Enoh (National Astronomical Observatory of Japan) reported the
discovery of a potential comet by M. Iwamoto (872).  Confirmation of the
cometary nature came from K. Kadota (349), who reported a 2' diffuse coma
with central condensation and no tail.  A. Hale reported his visual
confirmation from Cloudcroft, NM on Dec. 20.51 UTC (mag. 11.5, 3'.1 coma,
0.41-m reflector).  H. Sato (H06, Dec. 20.5319 UTC) reported a strongly-
condensed object with an outer coma 2'.9 in diameter and no obvious tail.
B. Lutkenhoner (H06, Dec. 20.5315 UTC) reported a clear central condensation
and a coma diameter exceeding 1'.  E. Guido (H06, Dec. 20.538 UTC), described
a ~ 1'.5 diffuse coma with a sharp central condensation.  M. Suzuki (W88)
reported a 1'.0 coma with a strong central condensation.
  
Observations:
    CK18Y010* C2018 12 18.8410  14 17 45.33 -24 44 13.4          12   RzEY052872
    CK18Y010  C2018 12 18.8417  14 17 45.36 -24 44 15.8                zEY052872
    CK18Y010  C2018 12 19.83490 14 17 43.14 -24 41 53.7          13.4 RmEY052349
    CK18Y010  C2018 12 19.84200 14 17 43.14 -24 41 53.0                mEY052349
    CK18Y010  C2018 12 19.84908 14 17 43.12 -24 41 52.6                mEY052349
    CK18Y010 #C2018 12 20.32523 14 17 41.80 -24 40 35.0          13.9 GVEY052W88
    CK18Y010 #C2018 12 20.34097 14 17 41.71 -24 40 32.3          13.8 GVEY052W88
    CK18Y010 VC2018 12 20.53154 14 17 40.92 -24 40 08.2          16.2 RUEY052H06
    CK18Y010 |C2018 12 20.53197 14 17 40.90 -24 40 08.5                VEY052H06
    CK18Y010 VC2018 12 20.53470 14 17 40.92 -24 40 07.8          16.2 RUEY052H06
    CK18Y010 |C2018 12 20.53571 14 17 40.85 -24 40 08.0          12.3 GVEY052H06
    CK18Y010 %C2018 12 20.53800 14 17 40.93 -24 40 07.4          15.2 GVEY052H06
    CK18Y010 %C2018 12 20.53981 14 17 40.90 -24 40 07.8          15.5 GVEY052H06
    CK18Y010 VC2018 12 20.54277 14 17 40.88 -24 40 06.5          16.2 RUEY052H06
    CK18Y010  C2018 12 20.65085 14 17 40.58 -24 39 48.7          16.2 RqEY052T03
    CK18Y010  C2018 12 20.66220 14 17 40.52 -24 39 47.3          16.2 RqEY052T03
    CK18Y010  C2018 12 20.66409 14 17 40.53 -24 39 47.1          16.1 RqEY052T03
 
Observer details:
349 Ageo.  Observer K. Kadota.  0.25-m f/5.0 reflector + CCD.
872 Tokushima.  Observer M. Iwamoto.  Measurer S. Nakano.
H06 iTelescope Observatory, Mayhill.  Observers B. Lutkenhoner, H. Sato,
    E. Guido.  0.43-m f/6.8 reflector + CCD + f/4.5 focal reducer, 0.25-m
    f/3.4 astrograph + CCD, 0.1-m f/5.0 astrograph + CCD.
T03 Haleakala-LCO Clamshell #3.  Observer A. Hale.  Measurer R. Miles.
    0.40-m f/10 Schmidt-Cassegrain + CCD.
W88 Slooh.com Chile Observatory, La Dehesa.  Observer M. Suzuki.  0.35-m
    f/11.0 Schmidt-Cassegrain + CCD.
 
Orbital elements:
    C/2018 Y1 (Iwamoto)
T 2019 Jan. 27.15942 TT                                 MPCW
q   1.1407250            (2000.0)            P               Q
                   Peri.  354.05242     -0.83236045     +0.51328223
                   Node   140.77734     +0.52115657     +0.59647173
e   1.0            Incl.  160.69126     +0.18860516     +0.61705982
>From 17 observations 2018 Dec. 18-20.

Ephemeris:
    C/2018 Y1 (Iwamoto)
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   m1    m2
2018 11 20    14 13 19.7 -25 24 51   2.4430  1.5601    20.9    13.1  13.9
...
2018 12 05    14 16 39.1 -25 07 58   2.1246  1.4161    33.8    22.8  13.1
...
2018 12 13    14 17 36.8 -24 56 00   1.9189  1.3471    41.3    28.9  12.7
...
2018 12 19    14 17 44.8 -24 43 50   1.7489  1.3000    47.2    33.8  12.4
2018 12 20    14 17 42.5 -24 41 25   1.7193  1.2926    48.2    34.6  12.3
2018 12 21    14 17 38.9 -24 38 52   1.6894  1.2853    49.2    35.4  12.2
...
2018 12 27    14 16 48.4 -24 20 16   1.5028  1.2448    55.5    40.6  11.8
...
2019 01 04    14 13 53.5 -23 42 02   1.2366  1.1997    64.2    47.6  11.3
...
2019 01 19    13 55 20.0 -20 36 00   0.6968  1.1483    84.4    58.5   9.8

Gareth V. Williams           (C) Copyright 2018 MPC           M.P.E.C. 2018-Y52