Orbital changes of C/2002 T7 projected on its original orbit plane that described by five snapshots in CODE catalogue. Red line depicts the past motion of this comet while the blue line depicts its future evolution. Five epochs (snapshots) when orbital elements are recorded are marked: 1 - osculating heliocentric orbit near the centre of the observational interval (typically near the perihelion); 2 - original barycentric orbit recorded in the past at 250 au from the Sun; 3 - future barycentric orbit recorded in the future at 250 au from the Sun; 4 - previous orbit, recorded at the previous perihelion; 5 - next orbit, in this case recorded at the escape border at 120 000 au from the Sun, but for many other comets recorded in the next perihelion.

The cloud of 13517 clones of the star Gliese 710 drawn according to the covariance matrix taken from the Gaia DR2 catalogue. This cloud is projected onto the maximum scatter plane X'Y', coordinates are expressed in parsecs. The red dot is the Sun position, the green dot is the star nominal position during an encounter and the orange cross is the centroid of the clone cloud. The blue dotted circle shows the approximate extend of the cometary Oort cloud. This star parameters are known with a good precision so the cloud of clones is rather compact.

The cloud of 11327 clones of the star ALS 9243 drawn according to the covariance matrix taken from the Gaia DR2 catalogue. This cloud is projected onto the maximum scatter plane X'Y', coordinates are expressed in parsecs. The red dot is the Sun position, the green dot is the star nominal position during an encounter and the orange cross is the centroid of the clone cloud. The blue dotted circle shows the approximate extend of the cometary Oort cloud. This star parameters have the poor accuracy but the star must be studied in detail since it might have a large mass, even grater than 10 solar masses. Gliese 710 will pass the Sun even closer.