Poliastro: Can't get the example Plotting in 3D to work

[OrbitalMechanic]

Below is a copy of the example Plotting in 3D. I can run the just fine in Firefox. However, when I copy the code to Jupyter Notebook and attempt to run the same code (shown below), I get the errors below.

Have I missed something? Please advise.

Sam Dupree.

'''

!/Users/user/opt/anaconda3/bin/python

import numpy as np

from poliastro.examples import iss
from poliastro.examples import molniya

from poliastro.constants import J2000
from poliastro.examples import *
from poliastro.plotting import *

import plotly.io as pio
pio.renderers.default = "notebook_connected"

churi.plot(interactive=True, use_3d=True)

frame = OrbitPlotter3D()

frame.plot(churi)
frame.plot_body_orbit(Earth, J2000)

frame = OrbitPlotter3D()

frame.plot(molniya)
frame.plot(iss)

eros = Orbit.from_sbdb("eros")

frame = OrbitPlotter3D()

frame.plot_body_orbit(Earth, J2000)
frame.plot(eros, label="eros")

from poliastro.ephem import Ephem
from poliastro.util import time_range

date_launch = time.Time("2011-11-26 15:02", scale="utc").tdb
date_arrival = time.Time("2012-08-06 05:17", scale="utc").tdb

earth = Ephem.from_body(
Earth, time_range(date_launch, end=date_arrival, periods=50)
)

frame = OrbitPlotter3D()
frame.set_attractor(Sun)

frame.plot_body_orbit(Earth, J2000, label=Earth)

frame.plot_ephem(earth, label=Earth)

ValueError Traceback (most recent call last)
in
18
19 frame.plot(churi)
---> 20 frame.plot_body_orbit(Earth, J2000)
21
22 frame = OrbitPlotter3D()

~/opt/anaconda3/lib/python3.8/site-packages/poliastro/plotting/core.py in plot_body_orbit(self, body, epoch, label, color, trail)
96
97 """
---> 98 super().plot_body_orbit(body, epoch, label=label, color=color, trail=trail)
99
100 if not self._figure._in_batch_mode:

~/opt/anaconda3/lib/python3.8/site-packages/poliastro/plotting/_base.py in plot_body_orbit(self, body, epoch, label, color, trail)
265 # Do not return the result of self._plot
266 # This behavior might be overriden by subclasses
--> 267 self._plot_body_orbit(body, epoch, label=label, color=color, trail=trail)
268
269 def plot_ephem(self, ephem, epoch=None, *, label=None, color=None, trail=False):

~/opt/anaconda3/lib/python3.8/site-packages/poliastro/plotting/_base.py in _plot_body_orbit(self, body, epoch, label, color, trail)
169 period = get_mean_elements(body, epoch).period
170
--> 171 label = generate_label(epoch, label or str(body))
172 epochs = time_range(
173 epoch, periods=self._num_points, end=epoch + period, scale="tdb"

~/opt/anaconda3/lib/python3.8/site-packages/poliastro/plotting/util.py in generate_label(epoch, label)
18 def generate_label(epoch, label):
19 epoch = epoch.copy()
---> 20 epoch.out_subfmt = "date_hm"
21 label_ = f"{epoch.iso}"
22 if label:

~/opt/anaconda3/lib/python3.8/site-packages/astropy/time/core.py in out_subfmt(self, val)
620 def out_subfmt(self, val):
621 # Setting the out_subfmt property here does validation of val
--> 622 self._time.out_subfmt = val
623 del self.cache
624

~/opt/anaconda3/lib/python3.8/site-packages/astropy/time/formats.py in out_subfmt(self, subfmt)
181 def out_subfmt(self, subfmt):
182 # Validate subfmt value for this class, raises ValueError if not.
--> 183 self._select_subfmts(subfmt)
184 self._out_subfmt = subfmt
185

~/opt/anaconda3/lib/python3.8/site-packages/astropy/time/formats.py in _select_subfmts(cls, pattern)
394 if len(subfmts) == 0 and pattern != '*':
395 if len(cls.subfmts) == 0:
--> 396 raise ValueError(f'subformat not allowed for format {cls.name}')
397 else:
398 subfmt_names = [x[0] for x in cls.subfmts]

ValueError: subformat not allowed for format jyear_str
'''

[DhruvSondhi]

Hello @OrbitalMechanic, Please check my reply here and check issue #1091 ... This has been reported previously as well

[Yash-10]

Hello @OrbitalMechanic To summarize:

Based on yourpip freeze output from an earlier issue, you have astropy==4.2 installed. Just downgrade to astropy==4.0 and it should work.

This is the most common issue we had in recent times :)

[astrojuanlu]

Hi @OrbitalMechanic , thanks for another diligent report! Indeed, as @Yash-10 has pointed out downgrading astropy should fix the issue, until we make a new release. We will do it in the coming weeks hopefully.

[OrbitalMechanic]

Does poliastro ver. 0.15.0 now support astropy ver. 4.2.x?

[OrbitalMechanic]

Does poliastro ver. 0.15.0 support astropy ver. 4.2.x?

Sam Dupree.

On April/03/2021 13:07:13, Juan Luis Cano Rodríguez wrote:
>

Hi @OrbitalMechanic https://github.com/OrbitalMechanic , thanks for
another diligent report! Indeed, as @Yash-10
https://github.com/Yash-10 has pointed out downgrading astropy
should fix the issue, until we make a new release. We will do it in
the coming weeks hopefully.

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[astrojuanlu]

Hi @OrbitalMechanic! Yes, poliastro should work with Astropy 4.2. Could you please check, and report here if you find any issues?