S m i t h s o n i a n A s t r o p h y s i c a l O b s e r v a t o r y and H a r v a r d College O b s e r v a t o r y , C a m b r i d g e , M a s s a c h u s e t t s 021 38T h e L o s t City m e t e o r i t e was photographed i n flight and r e c o v e r e d by t h e P r a i r i e Network. F o u r f r a g m e n t s totaling 17 kg have been found. ALI analysis of a t h i r d m e t e o r , No, 405 0 3 , is p r e s e n t e d a s a counterexample t o the above a r g u m e n t 'This mete o r of 1 00 t i m e s the intensity of L o s t City r e a c h e d m a x i m u m light and then w a s extinguished nearly instantaneously. We recognize t h a t t h i s i s a different kind of m e t e o r o i d but have no s a t i s f a c t o r y explanation f o r i t s behavior. P h o t o m e t r i c and t r a j e c t o r y d a t a f o r the L o s t City m e t e o r and f o r a subs e q u e n t m e t e o r (No. 4061 7) with s i m i l a r flight c h a r a c t e r i s t i c s a r e u s e d t o e s t a b l i s h a p r e l i m i n a r y c a l i b r a t i o n of the m a s s s c a l e of o t h e r f i r e b a l l s . T h e r e i s e x c e l l e n t a g r e e m e n t between t h e p h o t o m e t r i c m a s s e s d e r i v e d f r o m t h e m o s t r e c e n t d e t e r m i n a t i o n of t h e luminous efficiency of the m e t e o r i c p r o c e s s , and the dynamic m a s s e s d e t e r m i n e d f r o m the t r a j e c t o r y and the s h a p e of the r e c o v e r e d m e t e o r i t e . It i s unlikely t h a t p h o t o m e t r i c m a s s e s a r e o v e r e s t i m a t e d by a s m u c h a s a f a c t o r ofT h e o r b i t s of t h e s e m e t e o r s a r e s i m i l a r t o t h o s e of m o s t o t h e r f i r e b a l l s . . T H E LOST CITY M E T E O RT h e L o s t City m e t e o r o c c u r r e d o v e r n o r t h e a s t e r n Oklahoma a t 2014 CST on J a n u a r y 3, 1970. T h e f i r e b a l l a t m a x i m u m light was c o m p a r a b l e i n b r i g h tn e s s t o the full moon. It w a s widely o b s e r v e d . Sonic booms w e r e r e p o r t e d 2 to have b e e n h e a r d o v e r a n a r e a of about 1000 k m between T u l s a and Tahlequah.2 W e l l -c o n f i r m e d r e p o r t s of t h e audio event c o v e r a n a r e a of a t l e a s t 300 k m , T h e m e t e o r was photographed f r o m f o u r P r a i r i e Network s t a t i o n s i n Hominy and Woodward, Oklahoma, and P l e a s a n t o n and G a r d e n City, K a n s a s D u r i n g t h e l a s t 1. 5 s e c of t h e t r a i l , t h r e e s e p a r a t e f r a g m e n t s a r e visible on t h e Hominy photograph. The o t h e r , m o r e distant s t a t i o n s e i t h e r do not show t h e end portion of t h e t r a i l o r have insvlficient resolution, The f a i n t e s t t r a i l (111) i s well separated on the photograph frorn the brightest (I) i o r the l.ast I s e c of its trajectory-and can be m e a s u r e d a s a s e p a r a t e object. At m its end h e i g h t ( 2 4 icrulj, the veiccity i s 4 lirnjsec, L he t r a i l of irrterrnediate brightness (11) i ...

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A heterometallic complex {[Yb2(L)6Cd2][Cd(H2O)6]·6H2O}n (Yb-Cd) (H2L = oxidiacetic acid) was synthesized under hydrothermal conditions. In Yb-Cd, each L chelates to one Yb(3+) center and bonds to two Cd(2+) ions in an anti-anti configuration. Yb and Cd atoms are arrayed alternatively and connected by O-C-O bridges to form a cubic octahedral cage as the secondary building unit. Consequently, topological NaCl nets with high symmetry in the cubic space group Fd-3c have been constructed. The [Cd(H2O)6](2+) moieties lying in the porosity of anionic metal-organic framework (MOF) act as the thermodynamically stable species, required to balance the two negative charges of [Yb2(L)6Cd2](2-) in Yb-Cd. Interestingly, when Yb-Cd was employed as a precursor and emerged in the aqueous solution of Mn(ClO4)2·6H2O or Zn(ClO4)2·6H2O, a reversible single-crystal-to-single-crystal transformation process driven by [Cd(H2O)6](2+) cations has been exhibited to generate the heterotrimetallic coordination polymer {[Yb2(L)6Cd2][Mn(H2O)6]·6H2O}n (Yb-Cd-Mn) or {[Yb2(L)6Cd2][Zn(H2O)6]·6H2O}n (Yb-Cd-Zn). To the best of out knowledge, Yb-Cd-Mn and Yb-Cd-Zn are the first examples representing 4d-4f-3d polymers based on multicarboxylic acid. Luminescent studies reveal that Yb-Cd-Zn may serve as a good candidate of Ni(2+) a luminescent probe. To our knowledge, Yb-Cd-Zn represent the fist example of the 4d-4f-3d framework to exhibit luminescent selectivity for Ni(2+).

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Observatory.-On the plates of the Harvard Patrol Collection, 6037 photographic estimates were obtained for this eclipsing system. We observed the behavior of the variable over an interval of more than 50 years and confirmed the irregularities in its maximum brightness shown by the photographic observations in the 1930's, particularly the "hump" (0 m 16) immediately after the primary minimum that seems to be a permanent feature of the system. The photographic light curve is tabulated in an abbreviated form : OpOOO 9 m 88 0p475 9 m 96 0p600 10 m 23 0p800 9 m 86 0.100 9.90 0.500 10.07 0.650 9.94 0.850 9.76 0.200 9.92 0.525 10.25 0.700 9.78 0.900 9.85 0.300 9.83 0.560 10.34 0.735 9.69 0.950 9.85 0.400 9.86 0.575 10.32 0.775 9.79 0.975 9.86The photoelectric observations, covering one complete cycle, were obtained in three colors on 56 nights during 1961-62. We used a photometer attached to the 24'' reflector at the George R. Agassiz Station of the Harvard College Observatory. The effective wavelengths of our system are similar to those of the UBV system. A 1P21 photomultiplier and a Brown recorder were used. The photoelectric light curve is similar to the photographic one, but shows detailed features : (2) The hump after the primary minimum is sharply defined and becomes more pronounced towards shorter wavelengths. Its amplitudes are about 0 m 126 in yellow and 0T279 in ultraviolet lights.(3) Other secondary fluctuations, especially strong before and after the primary minimum, appear on both the light and the color curves.(4) The color curves also indicate that the system has the largest color indices a few days after, possibly also before the mid-eclipse, but not during it.The photometric elements of BM Gas are : Min. = JD 2433859.0 +197 d 31E ; rni = 10 m 34, m 2 = 9 m 92, Mx = 9 m 69 (hump) ; the phase of the primary minimum is 0?56 (arbitrary).Since the system is a Beta Lyrae type and the secondary minimum is small and irregular, its dimensions are difficult to derive with certainty. They are, however, between those found by G. Thiessen (Z. Astrophys. 39, 65, 1956) and S. Gaposchkin {Harvard Ann. 113, No. 2, 1953).A Cislunar Orbit (IMP). Barbara E. Shute, Goddard Space Flight Center.-The orbital changes of a proposed cislunar satellite (IMP) have been investigated. Under the disturbing influence of the moon, the eccentricity changes from 0.95 to 0.85 in one year and the inclination (to the equator) moves from 33° to 48°-that is, a change of 15° with respect to the equator or 25° with respect to the plane of the ecliptic. In six years, the eccentricity decreases to a minimum of 0.209 and returns to 0.95 in 12 years, but perigee at this time is approximately 1 earth radius, indicating the demise of the satellite. The case quoted above assumes a ratio of semimajor axes of satellite to moon, a/a'=+ equivalent to a satellite period about 6 days. (Orbital changes are not due to sharp commensurability of the mean motions of the moon and satellite.) The other parameters are e 0 (eccentricity) =0.95, i 0 (inclination) =33...