2020MNRAS.493.5648T

2020MNRAS.493.5648T - Mon. Not. R. Astron. Soc., 493, 5648-5652 (2020/April-3)

Discovery of high-quality daytime seeing windows at the Antarctic Taishan station.

TIAN Q., JIANG P., JIN X., LI J., PEI C., DU F., LI Z., LI X., CHEN H., JI T., SHI X., ZHANG S., YANG C. and ZHOU H.

We report on the initial results of seeing measurements at the Antarctic Taishan Station (ATS) using a differential image motion monitor observed in the visible at a height of 2.5 m above the snow surface, during the site-testing experiments carried out on 2014 January 13 and 15. The median seeing was found to be 0.73 arcsec and the 25th and 75th percentiles of the seeing cumulative distribution were 0.59 and 0.87 arcsec, respectively, with a minimum of ∼0.5 arcsec at ∼16:00-19:00 local time (UTC + 5). Such a seeing minimum has a good temporal association with the refractive index structure constant (C_n^2) minimum simultaneously observed at ATS. Interestingly, both temporal windows of C_n^2 and seeing minimum coincide with those of minimum temperature gradients ( ∼0^○^Cm-1^), we had more than one month of continuous measurements of Cn2 and temperature gradients between 2013 December 30 and 2014 February 10. This suggests that high-quality seeing windows might be opened at ATS with the potential for astronomical activities, especially for solar observations.

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	* alf Car	*	06 23 57.10988	-52 41 44.3810	-0.49	-0.59	-0.74	-0.96	-1.13	A9II	461	1

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*` alf Car`**	`EUVE J0624-52.6`	`IRAS 06228-5240`	`SAO 234480`
`1AXG J062403-5241`	`EXSS 0622.7-5240`	`JP11 1384`	`SKY# 10936`
`CEL 1228`	`FK5 245`	`2MASS J06235709-5241441`	`SRS 30245`
`CPC 19 2125`	`GC 8302`	`N30 1391`	`TD1 7115`
`CPD-52 914`	`GCRV 4091`	`NAME Canopus`	`TIC 255559489`
`1E 0622.8-5239`	`GEN# +1.00045348`	`PLX 1497`	`TYC 8534-2277-1`
`2E 1642`	`HD 45348`	`PLX 1497.00`	`UBV 6431`
`2E 0622.8-5240`	`HIC 30438`	`PPM 335149`	`UBV M 12094`
`1ES 0622-52.6`	`HIP 30438`	`ROT 1039`	`uvby98 100045348`
`2EUVE J0624-52.6`	`HR 2326`	`1RXS J062357.2-524139`	`WEB 6060`

`CEL 1228`	`CPD-52 914`	`2E 1642`	`EUVE J0624-52.6`	`FK5 245`
`HD 45348`	`HIC 30438`	`HIP 30438`	`HR 2326`	`IRAS 06228-5240`
`2MASS J06235709-5241441`	`PLX 1497`	`PPM 335149`	`1RXS J062357.2-524139`	`SAO 234480`
`TD1 7115`	`TYC 8534-2277-1`	`uvby98 100045348`