PREDNASAJUCI / LECTURER :

Oleksandra Ivanova

(1) Astronomical Institute, Slovak Academy of Sciences,
059 60 Tatranská Lomnica

NAZOV / TITLE :

Quasi-simultaneous photometric, polarimetric, and spectral observations of active asteroid (248370) QN173

ABSTRAKT / ABSTRACT :

We present the results of observations of the new active asteroid (248370) QN173 obtained during July 2021 – 
January 2022. The direct images of the asteroid were obtained with broad-band filters with the help of three
telescopes. The spectrum of the asteroid closely matched that of a Ctype asteroid. The asteroid demonstrated a 
redder color compared to the Sun. The changes in dust productivity were not detected. The 𝑔 − 𝑟 color changes 
from 0.2 to 0.7𝑚 over the coma, and the linear polarization degree varies from about 1.2% to 0.2% and from −0.2% 
to −1.5% at the phase angle of 23.2◦ and 8.16◦. The total dust mass ejected until the latest observation on 
October 10 is 4.2 × 10^7 kg, with a maximum rate of 2.6 kg*s^−1 based on the Monte Carlo modeling of the dust 
tail. The estimated asteroid nucleus size is 1.3 km. The evolution of (248370) QN173 orbit and the orbits of the 
sample of the short periodic comets were followed.