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Comet 413P/LARSON  - (2014 E1 = 2020 W4)

Photometric data obtained from FOCAS-II software

COD B96

OBS BRIXIIS Observatory

CATALOG: Gaia DR2 - BAND: G

                                   10x10  20x20  30x30  40x40  50x50  60x60   SNR   SB   COD

COMET         UTC                    +/-    +/-    +/-    +/-    +/-    +/-     N  FWHM  CAT

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413P          18/04/2021 20:52:16  17.77  17.77  17.63                        4.0  17.4  B96

413P          18/04/2021 20:52:16*  0.16   0.07   0.03                          2   3.9  Gai

                                                                     AFRHO         LOG

COMET         UTC                   DELTA    r    BOX "   MAG   RSR    CM    +/-  AFRHO  OBS

------------  -------------------   -----  -----  -----  -----  ---  -----  ----  -----  ---

413P          18/04/2021 20:52:16    1.33   2.25  20.72  17.71    4      7     2  0.852  B96

FoCAs 3.66

www.astrosurf.com/cometas-obs

es.groups.yahoo.com/group/Cometas_Obs

Af(rho) data according the CARA-approach is available via request to CARA-coordinator

http://cara.uai.it

Discovery: (MPEC 2014-E78 : COMET P/2014 E1 (LARSON) + CBET 3827 : 20140312 : COMET P/2014 E1 (LARSON)

Peter Larson discovered this comet on CCD-images taken with the 0.68-m Schmidt of the CATALINA sky-survey on 21 jan. 2014; Object appears with about 17 th magnitude.

Recovery:

This object was first recovered by E. Schwab (Z84) on 2020 Nov. 11 25,  who described it as having "no tail and no coma visible."  Confirmation was submitted by E. Schwab on Dec. 11, reporting a FWHM 3".5 compared to 2".5  for background stars.  H. Sato (Q11) reports the appearance of a 10" coma  in 17-stacked observations obtained on Jan. 8.

The residuals of Schwab's initial recovery observations (see M.P.E.C. 2021-A147) are +41" in R.A. and -28" in Decl. from the prediction by S. Nakano in NK 2959 and in the ICQ's 2019 and 2020 Comet Handbooks, for which the indicated correction to the time of perihelion is -0.06 day.  The following linked orbital elements by Nakano are from 382 observations spanning 2014-2021 (mean residual 0".6). (CBET 4910:  COMET P/2014 E1)