FMR CORP
SC 13G/A, 2000-02-09
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SCHEDULE 13G

Amendment No. 2
Astropower Incorporated
common stock
Cusip # 04644A101


Cusip # 04644A101
Item 1:	Reporting Person - FMR Corp.
Item 4:	Commonwealth of Massachusetts
Item 5:	100
Item 6:	0
Item 7:	521,250
Item 8:	0
Item 9:	521,250
Item 11:	4.66%
Item 12:	    HC


Cusip # 04644A101
Item 1:	Reporting Person - Edward C. Johnson 3d
Item 4:	United States of America
Item 5:	0
Item 6:	0
Item 7:	521,250
Item 8:	0
Item 9:	521,250
Item 11:	4.66%
Item 12:	IN


Cusip # 04644A101
Item 1:	Reporting Person - Abigail P. Johnson
Item 4:	United States of America
Item 5:	None
Item 6:	None
Item 7:	521,250
Item 8:	None
Item 9:	521,250
Item 11:	4.66%
Item 12:	    IN



SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)


Item 1(a).	Name of Issuer:

		Astropower Incorporated

Item 1(b).	Name of Issuer's Principal Executive Offices:

		Solar Park
		Newark, DE 19716-2000

Item 2(a).	Name of Person Filing:

		FMR Corp.

Item 2(b).	Address or Principal Business Office or, if None,
Residence:

		82 Devonshire Street, Boston, Massachusetts  02109

Item 2(c).	Citizenship:

		Not applicable

Item 2(d).	Title of Class of Securities:

		common stock

Item 2(e).	CUSIP Number:

		04644A101

Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-
2(b) and the person filing, FMR Corp., is a parent
holding company in accordance with Section 240.13d-
1(b)(ii)(G).  (Note:  See Item 7).

Item 4.	Ownership

	(a)	Amount Beneficially Owned:
	521,250

	(b)	Percent of Class:
	4.66%

	(c)	Number of shares as to which such person has:

	(i)	sole power to vote or to direct the vote:
	100

	(ii)	shared power to vote or to direct the vote:
	0

	(iii)	sole power to dispose or to direct the
disposition of:	521,250

	(iv)	shared power to dispose or to direct the
disposition of:	0





Item 5.	Ownership of Five Percent or Less of a CommonStock.

	If this statement is being filed to report the fact
that as of the date hereof, the reporting person has
ceased to be the beneficial owner of more than five
percent of the class of securities, check the
following (X).

Item 6.	Ownership of More than Five Percent on Behalf of Another
Person.

	Not applicable

Item 7.	Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent
Holding Company.

	See attached Exhibit(s) A, B.

Item 8.	Identification and Classification of Members of the
Group.

	Not Applicable. See attached Exhibit A.

Item 9.	Notice of Dissolution of Group.

	Not applicable.

Item 10.	Certification.

	Inasmuch as the reporting persons are no longer the
beneficial owners of more than five percent of the
number of shares outstanding, the reporting persons
have no further reporting obligation under Section
13(d) of the Securities and Exchange Commission
thereunder, and the reporting persons have no
obligation to amend this Statement if any material
change occurs in the facts set forth herein.

Signature

	After reasonable inquiry and to the best of my
knowledge and belief, I certify that the information
set forth in this Schedule 13G in connection with
FMR Corp.'s beneficial ownership of the common stock
of Astropower Incorporated at January 31, 2000 is
true, complete and correct.

	February 10, 2000
Date


	/s/Eric D. Roiter
Signature


	Eric D. Roiter
	Duly authorized under
Power of Attorney
	dated December 30, 1997,
by and on behalf
	of FMR Corp. and its
direct and indirect
	subsidiaries




SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)

	Pursuant to the instructions in Item 7 of Schedule 13G,
Fidelity Management & Research Company ("Fidelity"), 82
Devonshire Street, Boston, Massachusetts 02109, a wholly-owned
subsidiary of FMR Corp. and an investment adviser registered
under Section 203 of the Investment Advisers Act of 1940, is the
beneficial owner of 521,150 shares or 4.65% of the common stock
outstanding of Astropower Incorporated  ("the Company") as a
result of acting as investment adviser to various investment
companies registered under Section 8 of the Investment Company
Act of 1940.

	Edward C. Johnson 3d, FMR Corp., through its control of
Fidelity, and the funds each has sole power to dispose of the
521,150 shares owned by the Funds.

	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR
Corp., has the sole power to vote or direct the voting of the
shares owned directly by the Fidelity Funds, which power resides
with the Funds' Boards of Trustees.  Fidelity carries out the
voting of the shares under written guidelines established by the
Funds' Boards of Trustees.

	Fidelity Management Trust Company, 82 Devonshire Street,
Boston, Massachusetts 02109, a wholly-owned subsidiary of FMR
Corp. and a bank as defined in Section 3(a)(6) of the Securities
Exchange Act of 1934, is the beneficial owner of 100 shares or
0.00% of the common stock outstanding of the Company as a result
of its serving as investment manager of the institutional
account(s).

	Edward C. Johnson 3d and FMR Corp., through its control of
Fidelity Management Trust Company, each has sole dispositive
power over 100 shares and sole power to vote or to direct the
voting of 100 shares of common stock owned by the institutional
account(s) as reported above.

	Strategic Advisers, Inc., 82 Devonshire Street, Boston, MA
02109, a wholly-owned subsidiary of FMR Corp. and an investment
adviser registered under Section 203 of the Investment Advisers
Act of 1940, provides investment advisory services to
individuals. It does not have sole power to vote or direct the
voting of shares of certain securities held for clients and has
sole dispositive power over such securities. As such, FMR Corp.'s
beneficial ownership may include shares beneficially owned
through Strategic Advisers, Inc.

	Members of the Edward C. Johnson 3d family are the
predominant owners of Class B shares of common stock of FMR
Corp., representing approximately 49% of the voting power of FMR
Corp.  Mr. Johnson 3d owns 12.0% and Abigail Johnson owns 24.5%
of the aggregate outstanding voting stock of FMR Corp.  Mr.
Johnson 3d is Chairman of FMR Corp. and Abigail P. Johnson is a
Director of FMR Corp.  The Johnson family group and all other
Class B shareholders have entered into a shareholders' voting
agreement under which all Class B shares will be voted in
accordance with the majority vote of Class B shares.
Accordingly, through their ownership of voting common stock and
the execution of the shareholders' voting agreement, members of
the Johnson family may be deemed, under the Investment Company
Act of 1940, to form a controlling group with respect to FMR
Corp.





SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)
RULE 13d-1(f)(1)  AGREEMENT

	The undersigned persons, on February 10, 2000, agree and
consent to the joint filing on their behalf of this Schedule 13G
in connection with their beneficial ownership of the common stock
of Astropower Incorporated at January 31, 2000.

FMR Corp.

By   /s/Eric D. Roiter
	Eric D. Roiter
	Duly authorized under Power of
Attorney
	dated December 30, 1997, by and on
behalf
	of FMR Corp. and its direct and
indirect
	subsidiaries

Edward C. Johnson 3d

By   /s/Eric D. Roiter
	Eric D. Roiter
	Duly authorized under Power of
Attorney
	dated December 30, 1997, by and on
behalf
	of Edward C. Johnson 3d

Abigail P. Johnson

By   /s/Eric D. Roiter
	Eric D. Roiter
	Duly authorized under Power of
Attorney
	dated December 30, 1997, by and on
behalf
	of Abigail P. Johnson

Fidelity Management & Research
Company

By   /s/Eric D. Roiter
	Eric D. Roiter
	Senior V.P. and General Counsel







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