Solutions

Selecting data

Objects with orbital period longer than 250 days:

exo_df[exo_df['orbital_period'] > 250.]

	name	orbital_period	semi_major_axis	eccentricity	discovered	detection_type	star_name	star_distance	star_metallicity	star_mass	star_sp_type
0	11 Com b	326.030	1.2900	0.23100	2008.0	Radial Velocity	11 Com	110.60	-0.350	2.700	G8 III
1	11 UMi b	516.220	1.5400	0.08000	2009.0	Radial Velocity	11 UMi	119.50	0.040	1.800	K4III
3	14 Her b	1773.400	2.7700	0.36900	2002.0	Radial Velocity	14 Her	18.10	0.430	0.900	K0 V
4	16 Cyg B b	799.500	1.6800	0.68900	1996.0	Radial Velocity	16 Cyg B	21.41	0.080	1.010	G2.5 V
5	18 Del b	993.300	2.6000	0.08000	2008.0	Radial Velocity	18 Del	73.10	-0.052	2.300	G6III
...	...	...	...	...	...	...	...	...	...	...	...
3821	sig Per b	579.800	1.8000	0.30000	2014.0	Radial Velocity	sig Per	108.30	-0.220	2.250	K3III
3824	tau Cet f	636.130	1.3340	0.16000	2012.0	Radial Velocity	tau Cet	3.65	-0.550	0.783	G8.5 V
3827	tau Gem b	305.500	1.1700	0.03100	2004.0	Radial Velocity	tau Gem	98.40	0.140	2.300	K2III
3830	ups And d	1281.439	2.5500	0.31600	1999.0	Radial Velocity	ups And	13.47	0.090	1.270	F8 V
3831	ups And e	3848.860	5.2456	0.00536	2010.0	Radial Velocity	ups And	13.47	0.090	1.270	F8 V

523 rows × 11 columns

Objects with eccentricity below 0.15:

exo_df[exo_df['eccentricity'] < 0.15]

	name	orbital_period	semi_major_axis	eccentricity	discovered	detection_type	star_name	star_distance	star_metallicity	star_mass	star_sp_type
1	11 UMi b	516.22000	1.5400	0.08000	2009.0	Radial Velocity	11 UMi	119.5000	0.040	1.800	K4III
2	14 And b	185.84000	0.8300	0.00000	2008.0	Radial Velocity	14 And	76.4000	-0.240	2.200	K0III
5	18 Del b	993.30000	2.6000	0.08000	2008.0	Radial Velocity	18 Del	73.1000	-0.052	2.300	G6III
7	24 Boo b	30.35060	0.1900	0.04200	2018.0	Radial Velocity	24 Boo	100.0000	-0.770	0.990	G3IV
8	24 Sex b	452.80000	1.3330	0.09000	2010.0	Radial Velocity	24 Sex	72.2084	-0.030	1.540	G5
...	...	...	...	...	...	...	...	...	...	...	...
3822	tau Boo b	3.31249	0.0460	0.07870	1996.0	Radial Velocity	tau Boo	15.6000	0.280	1.300	F7 V
3825	tau Cet g	20.00000	0.1330	0.06000	2017.0	Radial Velocity	tau Cet	3.6500	-0.550	0.783	G8.5 V
3827	tau Gem b	305.50000	1.1700	0.03100	2004.0	Radial Velocity	tau Gem	98.4000	0.140	2.300	K2III
3828	ups And b	4.61711	0.0590	0.01186	1996.0	Radial Velocity	ups And	13.4700	0.090	1.270	F8 V
3831	ups And e	3848.86000	5.2456	0.00536	2010.0	Radial Velocity	ups And	13.4700	0.090	1.270	F8 V

881 rows × 11 columns

Objects with orbital period longer than 250 days and eccentricity below 0.15:

exo_df[(exo_df['orbital_period'] > 250.) & (exo_df['eccentricity'] < 0.15)]

	name	orbital_period	semi_major_axis	eccentricity	discovered	detection_type	star_name	star_distance	star_metallicity	star_mass	star_sp_type
1	11 UMi b	516.22	1.5400	0.08000	2009.0	Radial Velocity	11 UMi	119.5000	0.040	1.80	K4III
5	18 Del b	993.30	2.6000	0.08000	2008.0	Radial Velocity	18 Del	73.1000	-0.052	2.30	G6III
8	24 Sex b	452.80	1.3330	0.09000	2010.0	Radial Velocity	24 Sex	72.2084	-0.030	1.54	G5
11	38 Vir b	825.90	1.8200	0.03000	2016.0	Primary Transit	38 Vir	NaN	0.070	1.18	F6 V
14	47 Uma b	1078.00	2.1000	0.03200	1996.0	Radial Velocity	47 Uma	13.9700	0.000	1.03	G0V
...	...	...	...	...	...	...	...	...	...	...	...
3813	mu Leo b	357.80	1.1000	0.09000	2014.0	Radial Velocity	mu Leo	38.0500	0.300	1.50	K2III
3814	nu Oph b	530.21	1.7900	0.12400	2004.0	Radial Velocity	nu Oph	46.8000	0.130	3.04	K0III
3816	ome Ser b	277.02	1.1000	0.10600	2013.0	Radial Velocity	ome Ser	80.6000	-0.240	2.17	G8 III
3827	tau Gem b	305.50	1.1700	0.03100	2004.0	Radial Velocity	tau Gem	98.4000	0.140	2.30	K2III
3831	ups And e	3848.86	5.2456	0.00536	2010.0	Radial Velocity	ups And	13.4700	0.090	1.27	F8 V

158 rows × 11 columns