221 Eos

Asteroid profile

Class: MBA

Family: Eos

Tholen: S

SMASSII: K

GAjpl: 0.166

GAminorpl: 0.1262

Notes on albedo parameters:

GAjpl — geometric albedo from the NASA JPL Small-Body Database.
GAminorpl — geometric albedo from the Minor Planet Physical Properties Database.

Total observations: 41

Bands: B, H, I, J, R, U, V

Observatories: CASLEO, CASLEO 2.15, Calern, Palomar

References: 2011 Gil-Hutton, 2014 Gil-Hutton, 2017 Devogele, 2017a Gil-Hutton, 2025 Masiero

All rows for this asteroid are exported.

Measurements

Sorting: first by filter groups (U-like, B-like, V-like, R-like, I-like, IR), then by filter, then by phase angle.

Date	Band	Phase	P	sP	Q	sQ	Pr	Qr	Psi	Obs	Ref
2005 / 09 / 30	U	9.53	None	0.185	None	4.6	-1.09	91.2	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	U	9.84	None	0.21	None	3.9	-1.13	80.4	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 28	U	10.45	None	0.23	None	3.5	-0.89	66.2	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 30	B	9.53	None	0.217	None	4.1	-1.24	84.1	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	B	9.84	None	0.13	None	5.2	-0.7	89.5	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	B	10.14	None	0.12	None	3.5	-0.88	86.5	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 28	B	10.45	None	0.08	None	3.0	-0.75	91.3	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 27	B	10.78	None	0.14	None	3.8	-0.93	85.6	None	CASLEO 2.15	2014 Gil-Hutton
2008 / 04 / 04	V	6.0	0.77	0.04	140.1	1.7	-0.76	None	143.3	CASLEO	2011 Gil-Hutton
2009 / 06 / 23	V	7.2	0.8	0.06	136.3	2.1	-0.8	None	137.5	CASLEO	2011 Gil-Hutton
2005 / 09 / 30	V	9.53	None	0.009	None	0.2	-1.07	89.0	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	V	9.84	None	0.1	None	2.8	-1.04	89.7	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	V	10.14	None	0.07	None	2.6	-0.8	89.6	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 28	V	10.45	None	0.08	None	2.5	-0.88	87.0	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 27	V	10.78	None	0.15	None	4.1	-0.75	100.1	None	CASLEO 2.15	2014 Gil-Hutton
2008 / 05 / 07	V	14.5	0.71	0.06	124.2	2.5	-0.7	None	121.1	CASLEO	2011 Gil-Hutton
2015 / 07 / 20	V	16.6	0.56	0.08	64.3	3.9	-0.55	None	68.8	CASLEO	2017a Gil-Hutton
2009 / 04 / 17	V	16.8	0.31	0.05	98.0	4.6	-0.27	None	83.8	CASLEO	2011 Gil-Hutton
2015 / 07 / 14	V	17.78	None	0.06	None	None	-0.59	None	None	Calern	2017 Devogele
2005 / 09 / 30	R	9.53	None	0.086	None	2.2	-1.06	91.4	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	R	9.84	None	0.13	None	2.7	-1.21	87.3	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	R	10.14	None	0.08	None	2.2	-0.96	86.5	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 28	R	10.45	None	0.09	None	2.6	-0.91	92.4	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 27	R	10.78	None	0.12	None	4.4	-0.76	91.6	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 30	I	9.53	None	0.113	None	1.9	-1.22	100.2	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	I	9.84	None	0.3	None	9.4	-0.82	92.6	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 29	I	10.14	None	0.12	None	3.2	-0.9	94.4	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 28	I	10.45	None	0.16	None	3.8	-1.02	94.5	None	CASLEO 2.15	2014 Gil-Hutton
2005 / 09 / 27	I	10.78	None	0.28	None	9.3	-0.57	103.7	None	CASLEO 2.15	2014 Gil-Hutton
2021 / 11 / 08	H	7.6	None	0.1	None	2.2	-1.31	87.0	None	Palomar	2025 Masiero
2023 / 01 / 07	H	9.6	None	0.11	None	2.2	-1.32	90.5	None	Palomar	2025 Masiero
2024 / 05 / 19	H	12.8	None	0.13	None	3.2	-1.28	86.9	None	Palomar	2025 Masiero
2025 / 05 / 28	H	16.4	None	0.11	None	2.9	-1.13	88.5	None	Palomar	2025 Masiero
2022 / 12 / 01	H	16.8	None	0.11	None	2.3	-1.31	92.1	None	Palomar	2025 Masiero
2024 / 01 / 29	H	17.4	None	0.16	None	3.6	-0.9	87.7	None	Palomar	2025 Masiero
2021 / 11 / 08	J	7.6	None	0.1	None	2.5	-1.16	88.5	None	Palomar	2025 Masiero
2023 / 01 / 07	J	9.6	None	0.1	None	2.7	-1.12	90.5	None	Palomar	2025 Masiero
2024 / 05 / 19	J	12.8	None	0.14	None	3.4	-1.3	89.3	None	Palomar	2025 Masiero
2025 / 05 / 28	J	16.4	None	0.11	None	2.9	-1.08	89.5	None	Palomar	2025 Masiero
2022 / 12 / 01	J	16.8	None	0.11	None	2.8	-1.05	84.0	None	Palomar	2025 Masiero
2024 / 01 / 29	J	17.4	None	0.12	None	3.5	-0.89	89.8	None	Palomar	2025 Masiero

Plot filters

The plot shows P_r, and if it is unavailable, P. Error bars use sP. The same reference is shown in the same color.

Marker shape encodes the filter group. Bottom legend: color = reference.

Plot legend

Marker shape → filter group

U-like B-like V-like R-like I-like IR Other

Color → reference