C/2012 T5 Bressi
more info
Comet C/2012 T5 was discovered on 14 October 2012 by Terry H. Bressi (Spacewatch), that is more than 4 months before its perihelion passage. It was observed until 21 March 2013 (see picture).
C/2012 T5 had its closest approach to the Earth on 25 February 2013 (0.913 au), a day after its perihelion passage.
Comet was lost a month after perihelion passage and Sekanina (2019) concluded that this Oort Cloud comet did not survive the observed perihelion passage.
Original value of 1/a is significantly negative for solutions based on entire data set. The preferred solution (based on pre-perihelion data taken at larger heliocentric distances than 1.33au) gives also negative value of original 1/a; however, within its uncertainty of about 1.5 sigma this comet can came from the Oort Cloud.
See also Królikowska 2020.

solution description
number of observations 610
data interval 2012 10 14 – 2012 12 31
data arc selection data generally limited to pre-perihelion (PRE)
range of heliocentric distances 9.39 au – 1.33au
detectability of NG effects in the comet's motion comet lost close to perihelion or split comet
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 1208
RMS [arcseconds] 0.75
orbit quality class 2b
orbital elements (heliocentric ecliptic J2000)
Epoch 2013 03 09
perihelion date 2013 02 24.05559295 ± 0.00030930
perihelion distance [au] 0.32276138 ± 0.00000568
eccentricity 1.00034964 ± 0.00000771
argument of perihelion [°] 318.103387 ± 0.000790
ascending node [°] 230.592692 ± 0.000123
inclination [°] 72.078053 ± 0.001873
recip semi-major axis [10-6 au-1] -1,083.27 ± 23.90
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line – the moment of perihelion passage