NEXXUS 2 - The database for Nearby X-ray and extreme UV emitting Stars

Star Page     -     NS 1257+3513 B   GJ 490 B   G 164-031   NLTT 32438

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ROSAT Survey Field Image Browser     SIMBAD entry

Star Information:

RA (2000.0)	DE (2000.0)	μ [ "/yr ]	θ [ ° ]	Spectral Type	B	V	Distance [ pc ]
12 57 39.35	+35 13 19.14	0.317	236.2	M4	14.8	13.16	19.2

ROSAT All-Sky Survey (RASS):

Detection Number	Count Rate	Background	Exposure Time	Likelihood	HR1	HR2	log Lx
1RXS J125740.2+351334	0.8377 ± 0.04181	0.00152	521	1170	-0.22 ± 0.04	0.07 ± 0.07	29.35

ROSAT Position Sensitive Proportional Counter (PSPC):

Detection Number	Sequence Id	Count Rate	Background	Likeli	OAX	Exposure Time	Observation Time	HR1	HR2	Images	log Lx
2RXP J125740.4+351324	600164 n00.007	0.6415 ± 0	0.00213	4326	27	12854	1991-12-20 to 1991-12-24	-0.24 ± 0.01	-0.06 ± 0.02	rgb rgbd	29.23
2RXP J125740.5+351333	701178 n00.021	0.5897 ± 0.0125	0.00161	3478	9	3760	1992-12-31 to 1992-12-31	-0.13 ± 0.02	-0.13 ± 0.03	rgb rgbd	29.19

ROSAT High Resolution Imager (HRI):

Detection Number	Sequence Id	Count Rate	SNR	OAX	Exposure Time	Observation Date	Images	log Lx
1RXH J125740.2+351333	201929 a01.001	0.1437 ± 0.00933	12.7	1	1652	1996-06-19 to 1996-06-19	rgb rgbd	29.18

ROSAT Wide Field Camera (WFC) All-Sky Survey:

Detection Number	RA (2000.0)	DE (2000.0)	S1 Count Rate	S2 Count Rate	Significance S1	Significance S2	Significance
2RE J1257+351	12 57 39.25	+35 13 16.8	0.02 ± 0	0.02 ± 0.01	6.1	5.5	8.2

ROSAT Wide Field Camera (WFC) Pointed Observations:

Source	RA (2000.0)	DE (2000.0)	Sequence ID	Count Rate	OAX	Significance	Filter	Observation Date
1	12 57 39.61	+ 35 13 57.2	600164 w00_s1a	0.0125 ± 0.00402	27.8	4.24	S1	1991-12-20T18:00
1	12 57 38.72	+ 35 13 44.3	600273 w01_s1a	0.02728 ± 0.00597	27.8	6.79	S1	1992-12-11T00:00

EUVE sources detected in other ways:

Detection Number	RA (2000.0)	DE (2000.0)	58-174 Å Count Rate	156-234 Å Count Rate	67-178 Å Count Rate	157-364 Å Count Rate
EUVE J1257+352	12 57 41	+35 13.6	0.035	0.06

Joint EUVE-ROSAT Detections:

Detection Number	RA (2000.0)	DE (2000.0)	58-174 Å Count Rate
EUVE J1257+352	12 57 40	+35 13 34	0.03

Einstein Imaging Proportional Counter (IPC):

Detection Number	RA (2000.0)	DE (2000.0)	Sequence ID	Count Rate	Exposure Time	SNR	OAX	Observation Date	Images	Data
2E 1255.3+3530	12 57 41.6	+35 13 25	445 2920	0.105 ± 0.01	2604.7	10.2	27.4	1978-12-18 to 1978-12-18	gif FITS	Events
2E 1255.3+3530	12 57 40.5	+35 13 45	5390 2920	0.059 ± 0.002	30711.8	25.6	27.1	1980-06-30 to 1980-07-03	gif FITS	Events

Einstein High Resolution Imager (HRI):

RA (2000.0)	DE (2000.0)	Sequence ID	Count Rate	Exposure Time	SNR	Observation Date	Images	Data
12 57 40	+35 13 34	10354 3	0.04512 ± 0.00632	12270.39	7.14	1981-01-18 to 1981-01-18	gif FITS	Events

Last modified on Tuesday, 28 October 2008.   C. Liefke | Impressum