Constellation Cassiopeia (Seated Queen)

Cassiopeia
Cassiopeia: IAU Constellation Map [150]

Properties

Cassiopeia belongs to the circumpolar constellations and is very noticeable. The five brightest stars form a spooky 'W' that is open to the north. With her husband Cepheus on the western side, she looks at her son-in-law Perseus and her daughter Andromeda in the south. The constellation is in the band of the Milky Way, roughly opposite its center and thus contains a number of open star clusters. The constellation has an area of 598 square degrees and its center culminates around midnight on October 9th. [9, 15]

Stars with Proper Names:

  • α Cas: Shedir, Schedar, Schedir
  • β Cas: Caph, Chaph, Kaff, Al Sanam Al Nakah
  • δ Cas: Ruchbah, Rucba, Rucha, Ksora
  • ε Cas: Segin, Ruchbah
  • η Cas: Achird
  • θ Cas: Marfak
  • μ Cas: Marfak
Data for constellation Cassiopeia [150]
IAU NameCassiopeia
IAU GenitiveCassiopeiae
IAU Abbr.Cas
English NameSeated Queen
Season (47° N)July … January
Right Ascension22h 57m 05s … 03h 41m 14s
Declination+46° 40' 33" … +77° 41' 32"
Area598 deg2
Neighbours (N↻)Cep, Lac, And, Per, Cam

Deep-Sky Object Descriptions

Mythology and History

In Greek mythology, the beautiful but also arrogant Cassiopeia represented the queen of Ethiopia, part of the royal family of heaven. In the sky she appears sitting on a chair. Her husband was King Cepheus and her daughter was Princess Andromeda. Cassiopeia insulted the beautiful daughters of the ancient sea god Nereus. She boasted that she was more beautiful than her. The nymphs complained to Poseidon, god of the seas, who thereupon sent the sea monster Cetus to destroy the Ethiopian coast and demanded Kassiopeia's daughter as a sacrifice. Andromeda was freed by Perseus.

Despite her daughter's rescue, she was reluctant to give Cassiopeia away. When the celebration of the wedding was interrupted by the intrusion of an armed band secretly sent by Cassiopeia and the leader of this group, Agenor, claimed the hand of Andromeda for himself, a battle broke out. Perseus killed a large number of his opponents, but the majority of his enemies were so powerful that he had to get the Gorgon head to put an abrupt end to the ghost. Two hundred of his enemies turned to stone in horror at the sight of Medusa's severed head. As if by magic, the wild noise of the battle faded away with one stroke. In this silence Poseidon had placed Cepheus and Cassiopeia under the stars. Cassiopeia had first been seen tied up in a market basket as a punishment, which in some seasons even stood upside down in the sky and showed her in a most uncomfortable position, where she was also exposed to the cheap ridicule of the common people. Today, on the other hand, you often see her depicted on a throne chair, in keeping with the dignity of her person, but this too is sometimes tilted dangerously in the sky.

Cassiopeia and Cassiepeia, as this constellation is sometimes written, is one of the oldest and most famous. Because of its shape one sometimes speaks of Heaven-W or Heaven-M. The Romans and the Greeks interpreted the constellation as a woman sitting on an armchair, a throne and therefore called Mulier Sedis or simply Sedes. In the 17th century, when the church tried to Christianize the constellation figures, the constellation Cassiopeia became the sinner Mary Magdalene.

The constellation Custos Messium (The Harvester) used to exist between Cassiopeia and the Pole Star. However, this constellation is no longer recognized today. [20, 74]

Catalogs

Yale Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) [154]
HR B F RA [hms] Dec [dms] vMag spType dMag Sep ["]
500 06 16.0+58 26 125.96 G5V 0.81.4
71000 06 26.5+64 11 465.59 B9III e
21β1100 09 10.7+59 08 592.27 F2III-IV 11.331.3
931200 24 47.5+61 49 525.40 B9III
1211300 31 25.3+66 31 106.18 B6V
123λ1400 31 46.4+54 31 204.73 B8Vn 0.20.5
130κ1500 33 00.0+62 55 544.16 B1Ia e
1371600 34 24.9+66 45 016.48 B9III
153ζ1700 36 58.3+53 53 493.66 B2IV
168α1800 40 30.5+56 32 142.23 K0IIIa 6.764.4
179ξ1900 42 03.9+50 30 454.80 B2V
184π2000 43 28.1+47 01 294.94 A5V
1922100 45 39.0+74 59 175.66 A2IV 5.536.0
193ο2200 44 43.5+48 17 044.54 B5IIIe 7.233.6
2082300 47 46.1+74 50 515.41 B8III
219η2400 49 06.0+57 48 573.44 F9V+dM0 4.011.6
223ν2500 48 50.1+50 58 064.89 B9III
253υ12600 55 00.1+58 58 224.83 K2III 7.694.1
264γ2700 56 42.5+60 43 002.47 B0IVe v6.32.3
265υ22800 56 39.8+59 10 524.63 G8IIIbFe-0.5
321μ3001 08 16.4+54 55 135.17 G5Vb 5.8190.5
3363101 10 39.3+68 46 435.29 A0Vnn
343θ3301 11 06.2+55 08 594.33 A7V 5.9145.6
3453201 11 41.4+65 01 085.57 B9IV
382φ3401 20 04.9+58 13 544.98 F0Ia 1.9133.8
3843501 21 05.2+64 39 306.34 A2Vnn 2.155.5
399ψ3601 25 56.0+68 07 484.74 K0III 5.223.2
403δ3701 25 49.0+60 14 072.68 A5III-IV v8.7131.7
4273801 31 13.8+70 15 535.81 F6V
442χ3901 33 55.9+59 13 554.71 G9IIIb
4564001 38 30.9+73 02 245.28 G8III 6.453.3
4784301 42 20.5+68 02 355.59 A0pSiSr
4804201 42 55.9+70 37 215.18 B9V
4914401 43 19.7+60 33 045.78 B8IIIn 5.166.0
542ε4501 54 23.7+63 40 123.38 B3III
548ω4601 56 00.0+68 41 074.99 B8III
5754802 01 57.4+70 54 254.54 A3IV 1.70.5
5805002 03 26.1+72 25 173.98 A2V
5814702 05 07.4+77 16 535.38 F0Vn 6.095.6
5865202 02 52.7+64 54 056.00 A1Vn
5895302 03 00.3+64 23 245.58 B8Ib
5924902 05 31.2+76 06 545.22 G8III 7.05.4
6405502 14 29.1+66 31 286.07 G0II-III+B9V
707ι02 29 04.0+67 24 094.52 A5pSr v2.22.3
8797123 06 36.9+59 25 114.85 B0.5IV
8822223 09 44.1+59 19 595.70 A5III 4.3167.2
8904423 24 50.3+62 16 584.98 M1III 2.598.6
9008τ523 47 03.5+58 39 074.87 K1IIIa
9018623 48 50.2+62 12 525.43 A3Ia e5.11.5
9045ρ723 54 23.0+57 29 584.54 G20e v
9071σ823 59 00.5+55 45 184.88 B1V 2.22.8
9100900 04 13.6+62 17 165.88 A1III 4.0246.0

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
Planetary Nebulae
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
IC 28903 10 19.2+61 19 03PN12.313.20.8pB, pL, R, bet 2 vF stPK 138+2.1, CS=16.8
IC 174701 57 35.8+63 19 22PN13.612.00.32Planetary, stellPK 130+1.1, CS=15.8
Galactic Nebulae
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
NGC 28100 52 53.8+56 37 30EN35 × 30F, vL, dif, S triple * on np edgeIC 11, LBN 616, in OCL 313
NGC 89602 25 27.8+62 01 10EN10 × 10eF, pL, iFIC 1795, LBN 645, CED 6, SG 1.04, Min 2-57, narrrow dark lane n-s, SNR ?
NGC 763523 20 45.0+61 12 42EN11.015 × 8vF, * 8 inv l excentricLBN 549, in Sh2-162, Bubble nebula
IC 5900 57 28.5+61 08 37EN10 × 5pF, eL ! (nf γ Cassiop)LBN 620, Gamma Cas nebula
IC 6300 59 29.0+60 54 40EN10 × 3pF, eL ! conn with np oneLBN 623, CED 4B, Gamma Cas nebula
IC 183102 44 00.0+63 00 36EN120vF, eeLCED 8
IC 187102 57 21.7+60 40 20EN* 9.3 nebs, chiefly fLBN 675
Open Clusters
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
NGC 10300 25 17.3+61 19 19II2p9.85Cl, pS, pC, st 11…18OCL 291
NGC 11000 27 25.4+71 23 26IV1p19Cl, pR, lC, st 9…12OCL 300
NGC 12900 29 58.0+60 12 42IV2p6.512Cl, vL, pR, lC, st 9…13OCL 294
NGC 13300 31 18.0+63 21 06IV1p9.43Cl, pL, st 10…, D * invOCL 296
NGC 13600 31 30.7+61 30 33II2p11.511.51.5globular, vF, S, eCOCL 295
NGC 14600 33 03.0+63 18 06IV3p9.15Cl, pL, lC, st 11-12, D *OCL 299
NGC 18900 39 35.6+61 05 42III2p8.85Cl, pL, R, st 11…15OCL 301
NGC 22500 43 36.0+61 46 00III1p7.015Cl, L, lC, st 9…10OCL 305
NGC 36601 06 25.9+62 13 44II3p4Cl, SOCL 316
NGC 38101 08 20.0+61 35 00III2p9.37Cl, pCOCL 317
NGC 43301 15 09.2+60 07 33III2p4Cl, S, lCOCL 319
NGC 43601 15 58.0+58 48 42I3m8.85Cl, S, iF, pCOCL 320
NGC 45701 19 33.0+58 17 42I3r6.420Cl, B, L, pRi, st 7, 8, 10OCL 321
NGC 55901 29 31.0+63 18 06II2m9.57Cl, B, pL, pRiOCL 322
NGC 58101 33 23.0+60 39 30III2p7.46Cl, pL, B, R, Ri, st 10…11M 103, OCL 326
NGC 60901 36 23.7+64 32 12II3r11.03Cl, S, pRi, st 14 ..OCL 325
NGC 63701 43 03.0+64 02 12I3p8.23Cl, pS, B & vF stOCL 329
NGC 65401 43 59.4+61 52 58II3m6.56Cl, iF, Ri, one * 6·7, st 11…14OCL 330
NGC 65701 43 29.8+55 52 30OCL7Cl, pRi, st 12OCL 337, *Grp ?
NGC 65901 44 24.0+60 40 12III1p7.96Cl, lRi, st BOCL 332
NGC 66301 46 17.0+61 13 06III2m7.115Cl, B, L, eRi, st pLOCL 333
NGC 74301 58 37.0+60 10 00II1p7Cl, not Ri, D * (h 1098)OCL 343
NGC 88602 23 28.1+63 46 16OCL14Cl, L, lC, sc, st 9…13*Grp ?
NGC 102702 42 36.0+61 35 42III2p6.715Cl, L, sc st, one 10 mIC 1824, OCL 357
NGC 765423 24 48.0+61 36 00I2r6.916Cl, L, Ri, mCM, R, st 9…13M 52, OCL 260
NGC 778823 56 46.0+61 24 00I2p9.44Cl, S, pRi, vC, st 10, 13…OCL 275
NGC 778923 57 28.6+56 42 52II2r6.725Cl, vL, vRi, vmC, st 11…18OCL 269
NGC 779023 58 24.2+61 12 30III2p8.55Cl, pRi, pCOCL 276
IC 16601 52 22.0+61 51 12III1r11.78S Cl, nebulous ?OCL 334
IC 159000 52 48.0+56 37 54OCL+ENCl, vL, st sc, 281 fin N 281
IC 180502 32 48.0+61 27 42III3pn6.520Cl, co, eL neby extends fOCL 352, Mel 15, LBN 654
IC 184802 51 18.0+60 24 30IV3pn6.518Cl, st F, extends 8m f, in F nebyOCL 364, LBN 667
Galaxies
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
NGC 14700 33 11.7+48 30 26E5/P10.59.513.2 × 7.8vF, vL, iR, gsmbM * 11UGC 326, MCG 8-2-5, DDO 3, CGCG 550-6
NGC 18500 38 57.6+48 20 14E310.19.28 × 7pB, vL, iR, vgmbM, rUGC 396, MCG 8-2-10, CGCG 550-9, IRAS 00362+4803
NGC 27800 52 04.5+47 33 03SBb11.510.82.1 × 2cB, pL, R, 2 st 10 nrUGC 528, MCG 8-2-16, CGCG 550-16, IRAS 00492+4716
NGC 134303 37 49.8+72 34 17SBb/P13.512.72.6 × 1.6F, vS, iR, gbM, D * v nrUGC 2792, MCG 12-4-1, CGCG 327-5, 7ZW 8, IRAS 03324+7224
IC 1000 20 24.5+59 17 33IBm11.810.46.4 × 5.3F * inv in eF, vL nebUGC 192, MCG 10-1-1, IRAS 00177+5900

References

9«Drehbare Sternkarte SIRIUS» von H. Suter-Haug; Hallwag-Verlag, Bern
15«Hartung's Astronomical Objects for Southern Telescopes» by David Malin and David J. Frew; Melbourne University Press 1995; ISBN 0-522-84553-3
20«Sternbilder und ihre Mythen» von Gerhard Fasching; Zweite, verbesserte Auflage; Springer Verlag Wien, New York; ISBN 3-211-82552-5 (Wien); ISBN 0-387-82552-5 (New York)
74The Starry Sky: Cassiopeia by Deborah Byrd; Astronomy 9/94, p.63
150IAU: The Constellations, 11. Oktober 2020; iau.org/public/themes/constellations
154Yale Bright Star Catalog, 15. Oktober 2020; tdc-www.harvard.edu/catalogs/bsc5.html
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)