17243-6214 B 1855 (HD 156907)

17^h 24^m 20.54^s -62° 13' 41.4" P.A. 185.00 sep 0.9 mag 9.64,10.02 Sp A2V

Coord 2000	17243-6214	Discov num	B 1855	Comp		Coord arcsec 2000	17 24 20.54 -62 13 41.4
Date first	1930	Date last	1991	Obs	3
Pa first	182	Pa last	185.4	P.A. Now (θ)	185.4°
Sep first	0.8	Sep last	0.851	Sep. Now (ρ)	0.851"
Mag pri	9.64	Mag sec	10.02	delta mag (ΔM)	0.38	Spectral class	A2V (white)
Pri motion ra	-002	Sec motion ra	-002
Pri motion dec	-011	Sec motion dec	-011
Notes

Nature of this double is uncertain.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 156907		Constellation	Ara		SAO	253905		Tycho2	9056-03784-1
Gaia DR2	5910393178511505024		HD	156907

WDS 17243-6214 B 1855 (HD 156907) : NOTES

No records found.

REFERENCES

refcode	metd	author	reference
B__1921a	orb -	van den Bos, W.H.	1921MNRAS..81..474V
B__1921a		MNRAS 81, 474, 1921
B__1921b	orb -	van den Bos, W.H.	.
B__1921b		Proc. Amsterdam Acad. 30, 72, 1921
B__1923a	Po j	van den Bos, W.H.	1923BAN.....1..193V
B__1923a		BAN 1, 193, 1923
B__1923b	orb -	van den Bos, W.H.	1923BAN.....2...25V
B__1923b		BAN 2, 25, 1923
B__1923c	orb -	van den Bos, W.H.	1923BAN.....2...29V
B__1923c		BAN 2, 29, 1923
B__1925a	Ma j	van den Bos, W.H.	1925AnLei..143...1V
B__1925a		Ann. Leiden Obs. 14, Pt.3, 1925
B__1925b	Ma j	van den Bos, W.H.	1925BAN.....2..197V
B__1925b	+Po	BAN 2, 197, 1925
B__1926a	orb -	van den Bos, W.H.	1926BAN.....3..127V
B__1926a		BAN 3, 127, 1926
B__1926b	orb -	van den Bos, W.H.	1926BAN.....3..128V
B__1926b		BAN 3, 128, 1926
B__1927a	orb -	van den Bos, W.H.	1927BAN.....3..261V
B__1927a		BAN 3, 261, 1927
B__1927b	-	van den Bos, W.H.	1927BAN.....4...45V
B__1927b		BAN 4, 45, 1927
B__1927b		(4th list of new southern double stars; precise measures in later references)
B__1927c	Ma -	van den Bos, W.H.	1927BAN.....4..109V
B__1927c		BAN 4, 109, 1927
B__1927c		(5th list of new southern double stars; precise measures in later references)
B__1927D	Ma -	van den Bos, W.H.	1927sdsc.book......
B__1927D		cited in SDS (Southern Double Star Cat.), 1927
B__1928a	Ma -	van den Bos, W.H.	1928BAN.....4..235V
B__1928a		BAN 4, 235, 1928
B__1928a		(6th list of new southern double stars; precise measures in later references)
B__1928b	Ma j	van den Bos, W.H.	1928AnLei..144...1V
B__1928b		Ann. Leiden Obs. 14, Pt.4, 1928
B__1928c	Ma -	van den Bos, W.H.	1928MNRAS..88..488F
B__1928c		MNRAS 88, 488, 1928
B__1928d	Ma j	van den Bos, W.H.	1928CiUO...78...13V
B__1928d		Union Obs. Johannesburg Circ. 78, 13, 1928
B__1928e	orb -	van den Bos, W.H.	.
B__1928e		Mem. Copenhagen Acad. 12, 2, 1928
B__1929a	Ma j	van den Bos, W.H.	1929CiUO...80...59V
B__1929a		Union Obs. Johannesburg Circ. 80, 59, 1929
B__1929b	orb -	van den Bos, W.H.	1929CiUO...79...49V
B__1929b		Union Obs. Johannesburg Circ. 79, 49, 1929
B__1929c	Ma -	van den Bos, W.H.	1929BAN.....5..125V
B__1929c		BAN 5, 125, 1929
B__1930a	Ma j	van den Bos, W.H.	1930CiUO...83..135V
B__1930a		Union Obs. Johannesburg Circ. 83, 135, 1930
B__1930b	Ma -	van den Bos, W.H.	1930BAN.....5..179V
B__1930b		BAN 5, 179, 1930
B__1930c	Ma -	van den Bos, W.H.	1930BAN.....5..183V
B__1930c		BAN 5, 183, 1930
B__1931a	Ma -	van den Bos, W.H.	1931MNRAS..92...19F
B__1931a		MNRAS 92, 19, 1931
B__1931b	Ma -	van den Bos, W.H.	1931CiUO...85..183V
B__1931b		Union Obs. Johannesburg Circ. 85, 183, 1931
B__1932a	Ma j	van den Bos, W.H.	1932CiUO...87..273V
B__1932a		Union Obs. Johannesburg Circ. 87, 273, 1932
B__1932b	Ma j	van den Bos, W.H.	1932CiUO...88..324V
B__1932b		Union Obs. Johannesburg Circ. 88, 324, 1932
B__1932C	Ma -	van den Bos, W.H.	1932QB821.A43......
B__1932C		cited in ADS (Aitken Double Star Cat.), 1932
B__1933a	Ma -	van den Bos, W.H.	1933BAN.....7....1V
B__1933a		BAN 7, 1, 1933
B__1933b	J -	van den Bos, W.H.	1933CiUO...90..379V
B__1933b		Union Obs. Johannesburg Circ. 90, 379, 1933
B__1933c	orb -	van den Bos, W.H.	1933CiUO...90..388V
B__1933c		Union Obs. Johannesburg Circ. 90, 388, 1933
B__1933d	Ma j	van den Bos, W.H.	1933CiUO...90..401V
B__1933d		Union Obs. Johannesburg Circ. 90, 401, 1933
B__1934a	Ma -	van den Bos, W.H.	1934CiUO...92...61V
B__1934a		Union Obs. Johannesburg Circ. 92, 61, 1934
B__1934b	orb -	van den Bos, W.H.	1934CiUO...92..102V
B__1934b		Union Obs. Johannesburg Circ. 92, 102, 1934
B__1935a	Ma j	van den Bos, W.H.	1935CiUO...94..134V
B__1935a	+J	Union Obs. Johannesburg Circ. 93, 134, 1935
B__1935b	orb -	van den Bos, W.H.	1935CiUO...94..148V
B__1935b		Union Obs. Johannesburg Circ. 94, 148, 1935
B__1935c	Ma j	van den Bos, W.H.	1935CiUO...94..149V
B__1935c		Union Obs. Johannesburg Circ. 94, 149, 1935
B__1935D	orb -	van den Bos, W.H.	1935QB821.A3.......
B__1935D		letter cited by Aitken, The Binary Stars, 1935
B__1936a	orb -	van den Bos, W.H.	1936CiUO...96..231V
B__1936a		Union Obs. Johannesburg Circ. 96, 231, 1936
B__1936b	Ma j	van den Bos, W.H.	1936CiUO...96..234V
B__1936b		Union Obs. Johannesburg Circ. 96, 234, 1936
B__1937a	orb -	van den Bos, W.H.	1937CiUO...98..341V
B__1937a		Union Obs. Johannesburg Circ. 98, 341, 1937
B__1937b	Ma -	van den Bos, W.H.	1937CiUO...98..362V
B__1937b		Union Obs. Johannesburg Circ. 98, 362, 1937
B__1938a	orb -	van den Bos, W.H.	1938CiUO...99..445V
B__1938a		Union Obs. Johannesburg Circ. 99, 445, 1938
B__1938d	orb -	van den Bos, W.H.	1938CiUO..100..480V
B__1938d		Union Obs. Johannesburg Circ. 100, 480, 1938
B__1938e	Ma j	van den Bos, W.H.	1938CiUO..100..481V
B__1938e		Union Obs. Johannesburg Circ. 100, 481, 1938
B__1940	orb -	van den Bos, W.H.	1940CiUO..102...49V
B__1940		Union Obs. Johannesburg Circ. 102, 49, 1940
B__1943A	Ma -	van den Bos, W.H.	1943AJ.....50..139A
B__1943A		cited by Alden (1943 AJ 50, 139)
B__1941	orb -	van den Bos, W.H.	1941CiUO..104...73V
B__1941		Union Obs. Johannesburg Circ. 104, 73, 1941
B__1945	orb -	van den Bos, W.H.	1945AJ.....51..198V
B__1945		AJ 51, 198, 1945
B__1947	Ma -	van den Bos, W.H.	1947CiUO..105..134V
B__1947		Union Obs. Johannesburg Circ. 105, 134, 1947
B__1947b	Po j	van den Bos, W.H. (in Voute et al.)	1947AnBos...6....3V
B__1947b		Ann. Bosscha Obs. Lembang 6, Pt.3, C1, 1947
B__1948	Ma -	van den Bos, W.H.	1948CiUO..107..259V
B__1948		Union Obs. Johannesburg Circ. 107, 259, 1948
B__1949a	orb -	van den Bos, W.H.	1949CiUO..108..310V
B__1949a		Union Obs. Johannesburg Circ. 108, 310, 1949
B__1949b	orb -	van den Bos, W.H.	1949CiUO..108..311V
B__1949b		Union Obs. Johannesburg Circ. 108, 311, 1949
B__1949c	Ma j	van den Bos, W.H.	1949CiUO..108..312V
B__1949c		Union Obs. Johannesburg Circ. 108, 312, 1949
B__1950a	orb -	van den Bos, W.H.	1950CiUO..109..366V
B__1950a		Union Obs. Johannesburg Circ. 109, 366, 1950
B__1950b	orb -	van den Bos, W.H.	1950CiUO..109..370V
B__1950b		Union Obs. Johannesburg Circ. 109, 370, 1950
B__1950c	Ma -	van den Bos, W.H.	1950CiUO..109..371V
B__1950c		Union Obs. Johannesburg Circ. 109, 371, 1950
B__1951a	Ma j	van den Bos, W.H.	1951CiUO..111...13V
B__1951a	+J	Union Obs. Johannesburg Circ. 111, 13, 1951
B__1951b	orb -	van den Bos, W.H.	1951CiUO..111...11V
B__1951b		Union Obs. Johannesburg Circ. 111, 11, 1951
B__1951c	orb -	van den Bos, W.H.	1951CiUO..112..143V
B__1951c		Union Obs. Johannesburg Circ. 112, 143, 1951
B__1951d	-	van den Bos, W.H.	1951JO.....34...85V
B__1951d		J. Obs. 34, 85, 1951
B__1953a	Ma -	van den Bos, W.H.	1953CiUO..113..185V
B__1953a		Union Obs. Johannesburg Circ. 113, 185, 1953
B__1953b	orb -	van den Bos, W.H.	1953CiUO..113..209V
B__1953b		Union Obs. Johannesburg Circ. 113, 209-219, 1953	1953MNSSA..12...19V
B__1953b		(also MNASSA 12, 19, 1953; MNASSA 12, 57, 1953)	1953MNSSA..12...57V
B__1954	orb -	van den Bos, W.H.	1954CiUO..114..235V
B__1954		Union Obs. Johannesburg Circ. 114, 235, 1954
B__1956a	Ma -	van den Bos, W.H.	1956CiUO..115..266V
B__1956a	+J	Union Obs. Johannesburg Circ. 115, 266, 1956
B__1956b	orb -	van den Bos, W.H.	1956CiUO..115..279V
B__1956b		Union Obs. Johannesburg Circ. 115, 279-284, 1956
B__1956c	orb -	van den Bos, W.H.	1956MNSSA..15...39V
B__1956c		MNASSA 15, 39, 1956
B__1957a	orb -	van den Bos, W.H.	1957CiUO..116..289V
B__1957a		Union Obs. Johannesburg Circ. 116, 289-291, 1957
B__1957b	Ma -	van den Bos, W.H.	1957CiUO..116..291V
B__1957b		Union Obs. Johannesburg Circ. 116, 291, 1957
B__1958	Ma -	van den Bos, W.H.	1958AJ.....63...63V
B__1958		AJ 63, 63, 1958
B__1959a	Mb j	van den Bos, W.H.	1959ApJS....4...45V
B__1959a		ApJS 4, 45, 1959
B__1959b	orb -	van den Bos, W.H.	1959JO.....42...79V
B__1959b		J. Obs. 42, 79, 1959
B__1959c	orb -	van den Bos, W.H.	1959JO.....42...93V
B__1959c		J. Obs. 42, 93, 1959
B__1959d	Ma -	van den Bos, W.H.	1959CiUO..118..308V
B__1959d		Union Obs. Johannesburg Circ. 118, 308, 1959
B__1959e	orb -	van den Bos, W.H.	1959CiUO..118..311V
B__1959e		Union Obs. Johannesburg Circ. 118, 311-312, 1959
B__1960a	Ma -	van den Bos, W.H.	1960CiUO..119..321V
B__1960a		Union Obs. Johannesburg Circ. 119, 321, 1960
B__1960b	Ma j	van den Bos, W.H.	1960PYerO...9....1B
B__1960b	+Mb	Pub. Yerkes Obs. 9, pt. 1, 1960
B__1960c	orb -	van den Bos, W.H.	1960JO.....43..145V
B__1960c		J. Obs. 43, 145, 1960
B__1960d	orb -	van den Bos, W.H.	1960JO.....43..152V
B__1960d		J. Obs. 43, 152, 1960
B__1960e	orb -	van den Bos, W.H.	1960CiUO..119..359V
B__1960e		Union Obs. Johannesburg Circ. 119, 339-340, 1960
B__1960f	orb -	van den Bos, W.H.	1960CiUO..119..341V
B__1960f		Union Obs. Johannesburg Circ. 119, 341-343, 1960
B__1961a	Ma -	van den Bos, W.H.	1961CiUO..120..353V
B__1961a		Union Obs. Johannesburg Circ. 120, 353, 1961
B__1961b	orb -	van den Bos, W.H.	1961CiUO..120..374V
B__1961b		Union Obs. Johannesburg Circ. 120, 374-375, 1961
B__1961c	orb -	van den Bos, W.H.	1961CiUO..120..377V
B__1961c		Union Obs. Johannesburg Circ. 120, 377-379, 1961
B__1961d	orb -	van den Bos, W.H.	1961CiUO..120..380V
B__1961d		Union Obs. Johannesburg Circ. 120, 380-381, 1961
B__1961e	orb -	van den Bos, W.H.	1961PASP...74..201V
B__1961e		PASP 74, 201, 1961
B__1962a	Ma -	van den Bos, W.H.	1962AJ.....67..141V
B__1962a		AJ 67, 141, 1962
B__1962b	orb -	van den Bos, W.H.	1962AJ.....67..552V
B__1962b		AJ 67, 552, 1962
B__1962c	orb -	van den Bos, W.H.	1962JO.....45...55V
B__1962c		J. Obs. 45, 55, 1962
B__1962d	Ma j	van den Bos, W.H.	1962AJ.....67..555V
B__1962d		AJ 67, 555, 1962
B__1963a	Ma -	van den Bos, W.H.	1963AJ.....68...57V
B__1963a		AJ 68, 57, 1963
B__1963b	Ma j	van den Bos, W.H.	1963AJ.....68..582V
B__1963b		AJ 68, 582, 1963
B__1964a	orb -	van den Bos, W.H.	1964ROCi..123...62V
B__1964a		Republic Obs. Circ. 123, 62, 1964
B__1964b	orb -	van den Bos, W.H.	1964JO.....47...34V
B__1964b		J. Obs. 47, 34, 1964
B__1965a	Ma -	van den Bos, W.H.	1965ROCi..124...70V
B__1965a		Republic Obs. Circ. 124, 70, 1965
B__1965b	orb -	van den Bos, W.H.	1965ROCi..124...86V
B__1965b		Republic Obs. Circ. 124, 86, 1965
B__1966a	Ma -	van den Bos, W.H.	1966ROCi..125...93V
B__1966a		Republic Obs. Circ. 125, 93, 1966
B__1966b	orb -	van den Bos, W.H.	1966ROCi..125..112V
B__1966b		Republic Obs. Circ. 125, 112, 1966
B__1966c	orb -	van den Bos, W.H.	1966ROCi..125..118V
B__1966c		Republic Obs. Circ. 125, 118, 1966
B__1966d	orb -	van den Bos, W.H.	1966ROCi..125..119V
B__1966d		Republic Obs. Circ. 125, 119-120, 1966
B__1967	Ma -	van den Bos, W.H.	1967ROCi..126..127V
B__1967		Republic Obs. Circ. 126, 127, 1967
B__1967b	orb -	van den Bos, W.H.	1967JO.....13..119V
B__1967b		J. Obs. 13, 119, 1967
B__1968	Ma -	van den Bos, W.H.	1968ROCi..127..157V
B__1968		Republic Obs. Circ. 127, 157, 1968
B__9999	Ma -	van den Bos, W.H.	...................
B__9999		Unpublished, manuscript or reference not found.

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
17243-6214	B 1855		1991	3	185	0.9	9.64	10.02	A2V		172420.54-621341.4

If you need more information about this double, apply for a data request form to the WDS.

WDS 17243-6214 B 1855 (HD 156907) : VISUAL OBSERVATIONS REPORTS

No records found.

WDS 17243-6214 B 1855 (HD 156907) : MEASURES

No records found.

WDS 17243-6214 (HD 156907) : VIRTUAL EYEPIECE

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

WDS 17243-6214 (HD 156907) : ALADIN DSS IMAGE @ 17^h 24^m 20.54^s -62° 13' 41.4"

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

WDS 17243-6214 B 1855 (HD 156907) : NEIGHBORHOODS

Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.

Show	name	coord_2000	discov#	comp	pa	sep	dist(')
Show		17243-6214	B 1855		185	0.9
Show		17231-6144	JSP 715		58	2.9	32
Show		17200-6207	RST5428		223	0.2	32
Show		17244-6141	JSP 716		87	2.7	34
Show		17278-6238	JAW 43		302	21.3	35
Show		17186-6231	JAW 42		334	24.8	44
Show		17295-6146	I 598	AB	136	1.2	46
Show		17295-6146	I 598	AC	31	15.9	46
Show		17295-6146	I 598	AD	268	52.6	46
Show		17213-6255	FGS 29		284	0.1	47
Show		17287-6250	TOI 907		52	3.7	48
Show		17177-6156	TDT 298		51	0.6	50
Show		17193-6254	WIS 316		185	83.9	54
Show		17321-6157	I 601	AB	78	6.4	57
Show		17169-6250	HJ 4925		307	23.4	63
Show		17278-6314	UC 3347		281	48.9	65
Show		17272-6105	RSS 441		18	8.0	72
Show		17249-6101	B 2408		135	2.0	73
Show		17336-6138	RST5084		316	1.0	75
Show		17351-6207	B 1861		271	1.5	76
Show		17143-6244	HDS2436		91	0.2	77
Show		17196-6101	TDT 308		292	2.6	81
Show		17250-6334	UC 3338		167	44.3	81
Show		17344-6130	SWR 224		270	31.8	84
Show		17297-6329	KPP4041		202	41.9	85
Show		17264-6338	RST 924		180	3.8	86
Show		17197-6053	TDT 310		163	2.6	88
Show		17357-6257	HJ 4956	AB	108	5.1	90
Show		17357-6257	BAU 50	AC	164	33.3	90
Show		17357-6257	BAU 50	AD	191	34.4	90
Show		17255-6039	TDT 344		138	1.3	95
Show		17159-6059	R 295	AB	173	12.0	96
Show		17159-6059	R 295	AC	216	40.0	96
Show		17190-6045	B 2830		91	4.1	98
Show		17156-6334	TDT 293		288	1.2	101
Show		17388-6214	UC 3380		240	54.6	102
Show		17311-6041	HJ 4951	AE	324	50.4	105
Show		17311-6041	EHR 15	AB	67	3.1	105
Show		17311-6041	EHR 15	AC	51	8.6	105
Show		17311-6041	EHR 15	AD	62	12.3	105
Show		17211-6031	FIN 254		245	2.9	106
Show		17123-6321	TDT 263		209	1.3	107
Show		17362-6331	LDS 604		211	105.9	112
Show		17224-6405	TDT 324		130	1.3	112
Show		17182-6027	CVN 28	AB	315	3.9	115
Show		17182-6027	CVN 28	Aa,Ab	196	0.2	115
Show		17182-6027	CVN 28	AC	103	5.9	115
Show		17182-6027	CVN 28	AD	68	7.3	115
Show		17182-6027	CVN 28	AE	195	10.8	115
Show		17182-6027	CVN 28	AF	71	11.6	115
Show		17182-6027	CVN 28	AG	207	12.0	115

WDS 17243-6214 : COMPONENTS

	A
B	pa=182.5° sep=0.85"

17243-6214 A

Componente originario normalizzato	AB	Name	HD 156907	Coord arcsec 2000	172420.54-621341.4	Mag	9.64
Spectral class	A2V (white)	PmRA	-2.00	PmDE	-11.0	SAO	253905
Tycho2	9056-03784-1	HD	156907	DM	CP-62 5561

Tycho2

Tycho2	9056-03784-1	Pflag	P	RAmdeg	261.08557901	DEmdeg	-62.22816929
PmRA	-2.3	PmDE	-11.1	E RAmdeg	13	E DEmdeg	13
E pmRA	2.2	E pmDE	2.1	EpRAm	1990.79	EpDEm	1990.71
Num	7	Q RAmdeg	0.9	Q DEmdeg	0.8	Q pmRA	1.0
Q pmDE	0.9	BTmag	9.814	E BTmag	0.023	VTmag	9.635
E VTmag	0.023	Prox	9	TYC	T	HIP
CCDM		RAdeg	261.08560694	DEdeg	-62.22805750	EpRA 1990	1.77
EpDE 1990	1.74	E RAdeg	12.6	E DEdeg	13.0	Posflg	D
Corr	0.1

SAO

SAO	253905	DelFlag		RA1950		PmRA1950	0.005
DE1950		PmDE1950	-0.01	Vmag	9.3	SpType	A0
Double code		Source	43	CatNum	5245	DM	CP-62 5561
DMcomp		BDsup		HD	156907	M HD	0
GC		RA1950rad	4.53653386	DE1950rad	-1.08528036	PmRA2000	0.004
PmDE2000	-0.01

CCDM

Ccdm	17243-6214	RComp		Comp	A	Note1
Note2		Discov num		DRAs	2.84	DDEs	19.0
R dRAs	10	Year		Theta		Rho
Obs	2	Vmag	9.8	Sp	A0	PmNote	*
PmRA	35	PmDE	-10	Dm number	-62 5561	Cat1	CPD
Name2	253905	Cat2	SAO	HD	156907	M HD
ADS BDS		M ADS BDS		N IDS		IDS	17151S6208A
HIC

17243-6214 B

Componente originario normalizzato	AB		Coord arcsec 2000	172420.53-621342.2		Mag	10.02		PmRA	-2.00
PmDE	-11.0		Tycho2	9056-03784-2		Calc delta mag	0.38		Calc coord	yes

Tycho2

Tycho2	9056-03784-2	Pflag	P	RAmdeg	261.08557901	DEmdeg	-62.22816929
PmRA	-2.3	PmDE	-11.1	E RAmdeg	13	E DEmdeg	13
E pmRA	2.2	E pmDE	2.1	EpRAm	1990.79	EpDEm	1990.71
Num	7	Q RAmdeg	0.9	Q DEmdeg	0.8	Q pmRA	1.0
Q pmDE	0.9	BTmag	10.152	E BTmag	0.026	VTmag	10.015
E VTmag	0.030	Prox	9	TYC	T	HIP
CCDM		RAdeg	261.08556000	DEdeg	-62.22829278	EpRA 1990	1.77
EpDE 1990	1.75	E RAdeg	16.6	E DEdeg	17.2	Posflg	D
Corr	0.1

CCDM

Ccdm	17243-6214	RComp		Comp	B	Note1
Note2		Discov num	B 1855	DRAs		DDEs
R dRAs		Year	1930	Theta	182	Rho	0.8
Obs	1	Vmag	10.1	Sp		PmNote
PmRA		PmDE		Dm number		Cat1
Name2		Cat2		HD		M HD
ADS BDS		M ADS BDS		N IDS		IDS	17151S6208B
HIC