For the epoch 06/21/2024 04:00 EDT in Gainesville, FL, Stellarium Web Places Pallas at an RA 1m 49s east of the position shown by SkySafari desktop. The result is that Pallas is closer to T CrB than what SkySafari shows. The photo that I posted several days ago showed Pallas in a position that agrees closely with SkySafari. So I think Stellarium Web is showing an incorrect position for Pallas. On the other hand, SkySafari and Stellarium agree closely with respect to the calculated RA/Dec & Az/El of T CrB. I believe this means that Stellarium Web is using old elements, an incorrect math model, or something else is wrong when it computes asteroidal positions.

Matt, you observed about the same time as I. Attach your FITS file, and I'll extract the Tricolor Green magnitude using PI and LesvePhotometry software.

Matthew, here are the photometry results:

T CRB,2460485.571557, 9.438, 0.004,TR

T CRB,2460485.571557,10.314, 0.004,TG

T CRB,2460485.571557,11.592, 0.005,TB

Column 1: object identifier;

Column 2: julian date;

Column 3: magnitude;

Column 4: error;

Column 5: filter.

Note that T CrB is brighter in the Red, which is brighter than in Green, which is brighter than Blue. The color index is TB-TG = 1.278, which indicates a very red star. The light of the red giant overwhelms the light of the white dwarf.

Attached is the AAVSOReport file, which you could upload to the AAVSO as your observation of T CrB. Before uploading, you would need to register with the AAVSO and then request your observer initials. Insert your observer initials into the data field #OBSCODE in the 2nd row of AAVSOReport.

My photometry of T CrB at two different times on the evening of June 23/24 gives the following results:

T CRB,2460485.597220,11.476, 0.005,TB

T CRB,2460485.597220,10.240, 0.004,TG

T CRB,2460485.597220, 9.453, 0.003,TR

T CRB,2460485.664577,11.524, 0.005,TB

T CRB,2460485.664577,10.226, 0.004,TG

T CRB,2460485.664577, 9.339, 0.003,TR

The two FITS images were debayered using Pixinsight to yield the Tricolor TR, TG, and TB images. LesvePhotometry software was used to extract the magnitudes in each of these three passbands. A characteristic of the Bayer array is that there are two G pixels for every R and B. One would expect, therefore, that the G images yield better photometric precision than the B and R images. Ordinarily, the TG magnitude is all that I report to the AAVSO, so this time is an exception. The calculated color index TB-TG = 1.236 in the case of the first image, and TB-TG = 1.298 in the case of the second image. Any number greater than 1 indicates a red star.

Matthew, congratulations on getting your AAVSO observer initials! You can create a light curve of any variable star using this link. https://www.aavso.org/LCGv2/ Just enter your star's identifier (e.g., T CrB)