Use Astropy table instead of pandas

Author: shreyasbapat

.travis.yml

@@ -33,7 +33,7 @@ env:
         - MAIN_CMD='python setup.py'
         - SETUP_CMD='test'
         - EVENT_TYPE='pull_request push'
-        - PIP_DEPENDENCIES='numpy scipy matplotlib pandas ads synphot https://github.com/astropy/astroquery/archive/master.zip pytest-astropy sphinx-astropy'
+        - PIP_DEPENDENCIES='numpy scipy matplotlib ads synphot https://github.com/astropy/astroquery/archive/master.zip pytest-astropy sphinx-astropy'
         - ADS_DEV_KEY=TjUyPHFOH48m5Katkeq0UCZQcejTg6bDbTuTGHxT
 
     matrix:

requirements.txt

@@ -4,4 +4,3 @@ matplotlib
 ads
 synphot
 git+git://github.com/astropy/astroquery.git@master#egg=astroquery
-pandas

sbpy/utils/dastcom5.py

@@ -5,9 +5,8 @@
 
 import astropy.units as u
 import numpy as np
-import pandas as pd
 from astropy.time import Time
-from astropy.table import Table
+from astropy.table import Table, vstack
 import astropy.units as u
 
 AST_DTYPE = np.dtype(
@@ -558,30 +557,19 @@ def entire_db():
     ast_database = asteroid_db()
     com_database = comet_db()
 
-    ast_database = pd.DataFrame(
+    ast_database = Table(
         ast_database[
             list(ast_database.dtype.names[:17])
             + list(ast_database.dtype.names[-4:-3])
             + list(ast_database.dtype.names[-2:])
         ]
     )
-    ast_database.rename(
-        columns={"ASTNAM": "NAME", "NO": "NUMBER", "CALEPO": "CALEPOCH"},
-        inplace=True
-    )
-    com_database = pd.DataFrame(
+    com_database = Table(
         com_database[
             list(com_database.dtype.names[:17])
             + list(com_database.dtype.names[-4:-3])
             + list(com_database.dtype.names[-2:])
         ]
     )
-    com_database.rename(
-        columns={"COMNAM": "NAME", "NO": "NUMBER", "CALEPO": "CALEPOCH"},
-        inplace=True
-    )
-    df = ast_database.append(com_database, ignore_index=True)
-    df[["NAME", "DESIG", "IREF"]] = df[["NAME", "DESIG", "IREF"]].apply(
-        lambda x: x.str.strip().str.decode("utf-8")
-    )
+    df = vstack(ast_database, com_database)
     return df