The high-resolution (R ~ 600) Spitzer/IRS spectrum of the bipolar protoplanetary nebula (PN) IRAS 17423-1755 is presented in order to clarify the dominant chemistry (C-rich versus O-rich) of its circumstellar envelope as well as to constrain its evolutionary stage. The high-quality Spitzer/IRS spectrum shows weak 9.7 μm absorption from amorphous

Interstellar absorption lines up to J″= 10 in the (2, 0) band and up to J″= 6 in the (3, 0) band of the C2 A1Πu-X1Σ+g system are detected toward star Cernis 52 (BD +31°640) in the Perseus molecular complex. The star lies in a reddened line of sight where various experiments have detected anomalous microwave emission spatially correlated with dust

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Observations were made in 12 runs, from 2003-09-29 to 2004-01-26. (5 data files).

We report on the follow up observations after the report of ~10 mHz quasi-periodic oscillations (QPO -- ATel #3225) in the X-ray light curve of the ongoing outburst of the black hole candidate IGR J17091-3624 (ATel #3144, #3159, #3167, #3203) RXTE/PCA observations performed on March 19th and March 22nd, 2011, show a continuous progression of flare

We introduce the idea that rotational fission is a possible mechanism in the formation of systems of large TNOs: binary systems, complex systems (Haumea), and TNO pairs. We also present N-body simulations of rotational fission.