Astronomical Diary
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Last Quarter New Moon First Quarter Full Moon
May 27
12:34 AM
May 05
06:45 AM
May 12
09:12 AM
May 19
05:11 AM
Current Condition X-ray Solar Flares

Speed: 544.3 km/sec
Density: 4.9 protons/cm3
More Data: ACE, DSCOVR

Explanation | More Data
Updated: May 02 at 0745 UT

***The sun is blank -- no sunspots.

Credit: Solar Dynamics Observatory(SDO)/Helioseismic
and Magnetic Imager (HMI).
Daily Sun: 02 May 2019
6-hr max: A7 0444 UT May02
24-hr: A7 0444 UT May02

Explanation | More Data

Updated: May 02 at 0700 UT
Time (PST) of rise and set of some planets at 10-day interval
Rise Set Rise Set Rise Set Rise Set Rise Set
May 01 4:31 AM 4:28 PM 4:04 AM 4:16 PM 8:09 AM 9:07 PM 9:14 PM *8:32 AM 11:09 PM *10:29 AM
May 11 4:50 AM 5:25 PM 4:05 AM 4:27 PM 7:58 AM 8:57 PM 8:32 PM *7:49 AM 10:29 PM *9:49 AM
May 21 5:25 AM 6:17 PM 4:07 AM 4:39 PM 7:47 AM 8:46 PM 7:48 PM *7:06 AM 9:48 PM *9:08 AM
May 31 6:11 AM 7:14 PM 4:11 AM 4:51 PM 7:36 AM 8:34 PM 7:04 PM *6:22 AM 9:07 PM *8:27 AM

* = following day
Astronomical Events May 2019
Meteor Shower

The month of May marks the occurrence of Eta Aquarid meteor shower. The shower occurs each year as a result of the Earth’s passing close to the orbit of Halley’s comet twice a year. The point from where the meteors appear to radiate is located within the constellation Aquarius, the Water Bearer as shown in Figures 2 & 2a. The radiant of the meteor shower will virtually lie on the celestial equator and is more favorable to southern hemisphere viewers. In the Northern Hemisphere, about 20 or more meteors per hour at the pre-dawn sky of May 6-7 may be seen.
Figure 2
(click to view image)
Figure 2a

(click to view image)
Stars and Constellations
As summer approaches, the days get longer in the Philippines. After sunset, the grouping of stars known as the Big Dipper is well placed high in the northeastern sky. The North Star Polaris can easily be located under normal weather condition by using the reference or the pointing stars namely Dubhe and Merak. By using their distance, an imaginary line can be drawn downward passing to these two stars and counting five times as shown in Figures 1 & 1a. Polaris actually is the endpoint star of the handle of the Small Dipper. The curved handle of the Big Dipper is pointing towards a bright orange star Arcturus of the constellation Bootes, the Herdsman.

Figure 1
(click to view image)
Figure 1a
(click to view image)
Planets Whereabout
On 01 May at 1:00 AM, Jupiter, and Saturn will be found at about 43, and 23 degrees above the east-southeastern horizon shining brightly at magnitudes -2.5, and +0.5 and will lie among the background stars of the constellations Ophiuchus, the Serpent-Bearer and Sagittarius, the Archer, respectively. They will remain visible throughout the month. These astronomical bodies will be good targets for observations using a binocular or a telescope under a cloudless sky condition.

At 5:00 AM, Neptune, Venus, and Mercury will be found, standing at about 32, 13 and 8 degrees above the eastern horizon with magnitudes +7.9, -3.8 and -0.35, respectively. Neptune will be located among the background stars of the constellation Aquarius, the Water-Bearer and observing this planet will require a telescope and a starmap under a dark and clear sky condition. Venus and Mercury will lie among the stars of the constellation Pisces, the Fish.

At 7:00 PM, Mars will be observed at about 18 degrees above the west-northwestern horizon glowing at magnitude +1.6 and will abode among the stars of the constellation Taurus, the Bull.

Uranus will be out for observation due to its proximity to the Sun.

Figures 3 & 4 shows how to compare apparent magnitudes and angular separation of celestial bodies such as planets and stars, respectively.
Figure 3
(click to view image)
Figure 4
(click to view image)
MAY 2019
2 Venus 4° N of Moon 8:00 PM
2 Vesta 0.2° S of Moon 9:00 PM
14 Moon at perigee (nearest distance to Earth = 369,046.514 km) 5:53 AM
21 Jupiter 1.7° S of Moon 1:00 AM
21 Mercury in superior conjunction 9:00 PM
23 Saturn 2° N of Moon 3:00 AM
26 Moon at apogee (farthest distance to Earth = 404.066.212 km) 9:27 PM
28 Neptune 4° N of Moon 2:00 AM
31 Vesta 0.6° S of Moon 4:00 AM