Exhibit 4.1


   


	NUMBER

                                               U-__________
	 	UNITS






  


	SEE REVERSE FOR

CERTAIN DEFINITIONS	ASTREA
    ACQUISITION CORP.	 



CUSIP [●]


 


UNITS CONSISTING OF
ONE SHARE OF COMMON STOCK AND ONE-HALF OF ONE WARRANT


 


THIS CERTIFIES THAT ______________________________________________________________________________


 


is the owner of ______________________________________________________________________________________
Units.


 


Each Unit (“Unit”)
consists of one (1) share of common stock, par value $0.0001 per share (“Common Stock”), of Astrea Acquisition
Corp., a Delaware corporation (the “Company”), and one-half of one warrant of the Company (“Warrant”).
Each whole Warrant entitles the holder to purchase one share of Common Stock for $11.50 per share (subject to adjustment). Each
Warrant will become exercisable 30 days after the Company’s completion of an initial merger, capital stock exchange, asset
acquisition, or other similar business combination with one or more businesses or entities (a “Business Combination”)
and will expire unless exercised before 5:00 p.m., New York City Time, on the fifth anniversary of the completion of an initial
Business Combination, or earlier upon redemption or liquidation. The Common Stock and Warrant(s) comprising the Unit(s) represented
by this certificate are not transferable separately until ninety (90) days following the IPO, unless EarlyBirdCapital, Inc. informs
the Company of its decision to allow earlier separate trading, except that in no event will the Common Stock and Warrants be separately
tradeable until the Company has filed an audited balance sheet reflecting the Company’s receipt of the gross proceeds of
its initial public offering and issued a press release announcing when such separate trading will begin. The terms of the Warrants
are governed by a Warrant Agreement, dated as of ___________, 2021, between the Company and Continental Stock Transfer & Trust
Company, as Warrant Agent, and are subject to the terms and provisions contained therein, all of which terms and provisions the
holder of this certificate consents to by acceptance hereof. Copies of the Warrant Agreement are on file at the office of the Warrant
Agent at 1 State Street, 30th Floor, New York, New York 10004, and are available to any Warrant holder on written request
and without cost.


 


This certificate is not valid unless
countersigned by the Transfer Agent and Registrar of the Company. Witness the facsimile seal of the Company and the facsimile signatures
of its duly authorized officers.


  




	By	 	 	 
	 	 	 	 
	 	Chairman	 	Secretary




 




     


     


    

 


Astrea Acquisition Corp.


 


The Company will furnish without charge
to each unitholder who so requests, a statement of the powers, designations, preferences, and relative, participating, optional,
or other special rights of each class of stock or series thereof of the Company and the qualifications, limitations, or restrictions
of such preferences and/or rights.


 


The following abbreviations, when used
in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable
laws or regulations:


 





	TEN COM	—	as tenants in common	 	UNIF GIFT MIN ACT	—	 	Custodian	 
	 	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 		 	
	 	 	 	 	 	 	 	 	 
	JT TEN	—	as joint tenants with right of survivorship
    and not as tenants in common	 	 	under
    Uniform Gifts to Minors Act
	 	 	 	 	(State)


 


Additional abbreviations may also be used
though not in the above list.


  


For
value received, ___________________________ hereby sell, assign, and transfer unto


 





	
        PLEASE INSERT SOCIAL SECURITY OR
OTHER

IDENTIFYING NUMBER OF ASSIGNEE
	 
	 

                                                               

                                                               
	 





 





	 
	(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	 
	 
	 
	 
	 
	 	 Units


represented by the within Certificate, and do hereby irrevocably
constitute and appoint


 





	 	 Attorney


to transfer the said Units on
the books of the within named Company with full power of substitution in the premises.


 





	Dated	 	 


  


	 	 	 
		Notice:	The signature to this assignment must correspond with the name as
written upon the face of the certificate in every particular, without alteration or enlargement or any change whatever.



  


Signature(s) Guaranteed:


 





	 	 
	THE SIGNATURE(S) SHOULD BE GUARANTEED
BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN
AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).	 


  





  


The holder(s) of this certificate shall be entitled to receive
a pro-rata portion of the funds from the trust account with respect to the common stock underlying the unit(s) represented by this
certificate only in the event that (i) the Corporation is forced to liquidate because it does not consummate an initial business
combination within the period of time set forth in the Corporation’s Amended and Restated Certificate of Incorporation, as
the same may be amended from time to time (the “Charter”) or (ii) if the holder seeks to convert his shares upon consummation
of, or sell his shares in a tender offer in connection with, an initial business combination or in connection with certain amendments
to the Charter. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account.