K2-256 Overview

K2-256 0.69 R_⦿ 5287.11 K

K2-256 b

0.235 R_Jup

Overview Notes 1 Parameters Nearby Data Bibliography 7 Legend Expand All

K2-256 Architecture & Discovery Information

Name	Orbital Separation	Planet Size	Method	Year	Reference	Disposition
K2-256
K2-256 b	5.52 d	2.63 R_⨁	Transit	2018	Livingston et al. 2018	False Positive Planet

Exoplanet Archive Notes (1)

K2-256 b

Confirmed planet signal refuted in ref. (Lehmann & Vanderburg 2024)

K2-256 Stellar Parameters (3 Solutions)

RA: 12h24m54.50s

Dec: -02d03m57.77s

Distance: 564.693+14.928-14.191
pc

Parallax: 1.7428300±0.0452949 mas

Ecliptic Latitude: .57538 deg

Ecliptic Longitude: 186.53057 deg

Galactic Latitude: 60.11398 deg

Galactic Longitude: 289.53796 deg

Total Proper Motion: 27.5476825±0.0658377 mas/yr

Proper Motion (RA): -11.9138000±0.0924475 mas/yr

Proper Motion (Dec): -24.8382000±0.0580134 mas/yr

Photometry: m_V
14.954±0.229; m_TESS
14.1710±0.0068; m_J
13.350±0.023; m_H
12.912±0.025; m_Ks
12.820±0.024; m_Kep
14.659; m_W1
12.795±0.025; m_W2
12.819±0.031; m_W3
12.051±0.330; m_W4
8.981; m_Gaia
14.699200±0.000346; m_B
15.701±0.014; m_g
15.2453000±0.0036304; m_i
14.4289000±0.0036454; m_r
14.6513000±0.0036924; m_u
16.6771000±0.0065925; m_z
14.3077000±0.0042753

Mission: K2 : Observed in Campaign 10

Tools: Planetary Systems; ExoFOP Target Overview Page; IRSA Finding Chart; K2 Planets and Candidates; K2 Targets; K2 Time Series

Source	TICv8	Gaia DR2	Livingston et al. 2018
T_eff (K)	5254.0±122.0	5287.1104+335.7370-187.4230	5219+179-136
L_✶ (log₁₀(L_⦿))	-0.4654812	-0.46944036+0.02448240-0.02594542	---
R_✶ (R_⦿)	0.706207	0.69421774+0.05196540-0.08042770	0.78±0.02
Metallicity (dex)	---	---	-0.10±0.17 [Fe/H]
M_✶ (M_⦿)	0.9	---	0.84+0.03-0.04
log g (log₁₀(cm/s²))	4.69445	---	4.58+0.01-0.02
ρ_✶ (g/cm³)	3.6025714	---	---

K2-256 b Planetary Parameters (1 Solution)

Status: False Positive Planet

Detected By: Transit

Tools: Transit Prediction Service; K2 Planets and Candidates

Source	Livingston et al. 2018
a/R_✶	7.6+1.3-1.9
T_eq (K)	845±28
b	0.42+0.34-0.29
P (days)	5.52011+0.00239-0.00289
R_p (R_⨁)	2.63+0.25-0.21
R_p (R_Jup)	0.235+0.022-0.019
R_p/R_✶	0.0309+0.0028-0.0022
a (au)	0.0578±0.0008
δ (%)	0.097
T₁₄ (hours)	3.6
T_C (days)	2457586.5247+0.0202-0.0191 (BJD)

Nearby Data (within 30 arcseconds) Browse Nearby Data

Known Objects: 1 K2 Targets; 1 2MASS Point Source Catalog

Data Files: 1 K2 Time Series

Bibliography (7 References)

Ephemeris Matching Reveals False Positive Validated and Candidate Planets from the K2 Mission
Lehmann & Vanderburg 2024 Reference Overview
The Revised TESS Input Catalog and Candidate Target List
TICv8 Reference Overview
44 Validated Planets from K2 Campaign 10
Livingston et al. 2018 Reference Overview
Gaia Data Release 2
Gaia DR2 Reference Overview
The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
EPIC Catalog Reference Overview
All WISE Data Release
Cutri et al. 2014 Reference Overview
2MASS All-Sky Catalog of Point Sources
2MASS Point Source Catalog Reference Overview

Legend

System
Star
Confirmed
Candidate
False Positive Planet
Controversial
False Positive

Aliases
Data Access
Transit Prediction Service
Time Series
Kepler | K2

External Link
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Debug Info

https://vmexoweb2.ipac.caltech.edu/data/Overviews_2.0/20/K2-256.json

K2-256

Catalog Parameters

12h24m54.50s

Dec

dec

-02d03m57.77s

elat

.57538

elon

186.53057

glat

60.11398

glon

289.53796

m_V

sy_vmag

14.954±0.229

m_TESS

sy_tmag

14.1710±0.0068

m_J

sy_jmag

13.350±0.023

m_H

sy_hmag

12.912±0.025

m_Ks

sy_kmag

12.820±0.024

m_Kep

sy_kepmag

14.659

m_W1

sy_w1mag

12.795±0.025

m_W2

sy_w2mag

12.819±0.031

m_W3

sy_w3mag

12.051±0.330

m_W4

sy_w4mag

8.981

sy_icmag

no_data

m_Gaia

sy_gaiamag

14.699200±0.000346

m_B

sy_bmag

15.701±0.014

m_g

sy_gmag

15.2453000±0.0036304

m_i

sy_imag

14.4289000±0.0036454

m_r

sy_rmag

14.6513000±0.0036924

m_u

sy_umag

16.6771000±0.0065925

m_z

sy_zmag

14.3077000±0.0042753

sy_pm

27.5476825±0.0658377

μ_δ

sy_pmdec

-24.8382000±0.0580134

μ_α

sy_pmra

-11.9138000±0.0924475

sy_plx

1.7428300±0.0452949

Distance

sy_dist

564.693+14.928-14.191

Set Parameters

R_✶

st_rad

0.69421774+0.05196540-0.08042770

T_eff

st_teff

5287.1104+335.7370-187.4230