| Parameter |
Value |
| Designation |
C/2014 OE4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-12-10T21:06:20.229120Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:38Z |
| Obs used |
1798 |
| NEO |
- |
| M1 |
7.400 |
| K1 |
7.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-05-12.0000000 |
| e |
0.99972574 |
| q (au) |
6.244383 |
| a (au) |
22768.366062 |
| i (deg) |
81.347248 |
| Ω (om, deg) |
240.394924 |
| ω (w, deg) |
65.755220 |
| M (ma, deg) |
0.000044 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.003 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.003 |
| n |
2.000 |
| gf |
0.897 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
4.682 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
03:49:49.96 |
+21:03:14.6 |
HIP 17909 |
6.39 |
| 2026-05-12 12:00 |
03:49:55.93 |
+21:03:18.5 |
HIP 17909 |
6.60 |
| 2026-05-13 00:00 |
03:50:01.90 |
+21:03:22.3 |
HIP 17909 |
7.09 |
| 2026-05-13 12:00 |
03:50:07.88 |
+21:03:26.2 |
HIP 17909 |
7.79 |
| 2026-05-14 00:00 |
03:50:13.86 |
+21:03:30.1 |
HIP 17909 |
8.67 |
| 2026-05-14 12:00 |
03:50:19.84 |
+21:03:34.0 |
HIP 17909 |
9.67 |
| 2026-05-15 00:00 |
03:50:25.83 |
+21:03:37.9 |
HIP 17909 |
10.76 |
| 2026-05-15 12:00 |
03:50:31.83 |
+21:03:41.9 |
HIP 17909 |
11.92 |
| 2026-05-16 00:00 |
03:50:37.82 |
+21:03:45.8 |
HIP 17909 |
13.12 |
| 2026-05-16 12:00 |
03:50:43.82 |
+21:03:49.8 |
HIP 17909 |
14.36 |
| 2026-05-17 00:00 |
03:50:49.82 |
+21:03:53.7 |
HIP 17909 |
15.63 |
| 2026-05-17 12:00 |
03:50:55.82 |
+21:03:57.7 |
HIP 17909 |
16.92 |
| 2026-05-18 00:00 |
03:51:01.83 |
+21:04:01.7 |
HIP 17909 |
18.22 |
| 2026-05-18 12:00 |
03:51:07.83 |
+21:04:05.7 |
HIP 17909 |
19.54 |
| 2026-05-19 00:00 |
03:51:13.84 |
+21:04:09.7 |
HIP 17909 |
20.87 |
| 2026-05-19 12:00 |
03:51:19.85 |
+21:04:13.6 |
HIP 17909 |
22.21 |
| 2026-05-20 00:00 |
03:51:25.85 |
+21:04:17.6 |
HIP 17909 |
23.56 |
| 2026-05-20 12:00 |
03:51:31.86 |
+21:04:21.6 |
HIP 17909 |
24.91 |
| 2026-05-21 00:00 |
03:51:37.87 |
+21:04:25.6 |
HIP 17909 |
26.27 |
| 2026-05-21 12:00 |
03:51:43.87 |
+21:04:29.6 |
HIP 17909 |
27.63 |
| 2026-05-22 00:00 |
03:51:49.87 |
+21:04:33.6 |
HIP 17909 |
28.99 |
| 2026-05-22 12:00 |
03:51:55.87 |
+21:04:37.5 |
HIP 17909 |
30.36 |
| 2026-05-23 00:00 |
03:52:01.87 |
+21:04:41.5 |
HIP 18244 |
29.50 |
| 2026-05-23 12:00 |
03:52:07.87 |
+21:04:45.5 |
HIP 18244 |
28.10 |
| 2026-05-24 00:00 |
03:52:13.86 |
+21:04:49.4 |
HIP 18244 |
26.71 |
| 2026-05-24 12:00 |
03:52:19.85 |
+21:04:53.3 |
HIP 18244 |
25.31 |
| 2026-05-25 00:00 |
03:52:25.84 |
+21:04:57.3 |
HIP 18244 |
23.92 |
| 2026-05-25 12:00 |
03:52:31.82 |
+21:05:01.2 |
HIP 18244 |
22.53 |
| 2026-05-26 00:00 |
03:52:37.80 |
+21:05:05.1 |
HIP 18244 |
21.14 |
| 2026-05-26 12:00 |
03:52:43.78 |
+21:05:09.0 |
HIP 18244 |
19.75 |
| 2026-05-27 00:00 |
03:52:49.75 |
+21:05:12.9 |
HIP 18244 |
18.36 |
| 2026-05-27 12:00 |
03:52:55.71 |
+21:05:16.7 |
HIP 18244 |
16.98 |
| 2026-05-28 00:00 |
03:53:01.67 |
+21:05:20.6 |
HIP 18244 |
15.60 |
| 2026-05-28 12:00 |
03:53:07.62 |
+21:05:24.4 |
HIP 18244 |
14.22 |
| 2026-05-29 00:00 |
03:53:13.57 |
+21:05:28.2 |
HIP 18244 |
12.85 |
| 2026-05-29 12:00 |
03:53:19.51 |
+21:05:32.0 |
HIP 18244 |
11.48 |
| 2026-05-30 00:00 |
03:53:25.44 |
+21:05:35.7 |
HIP 18244 |
10.13 |
| 2026-05-30 12:00 |
03:53:31.37 |
+21:05:39.5 |
HIP 18244 |
8.78 |
| 2026-05-31 00:00 |
03:53:37.29 |
+21:05:43.2 |
HIP 18244 |
7.44 |
| 2026-05-31 12:00 |
03:53:43.20 |
+21:05:46.9 |
HIP 18244 |
6.13 |
| 2026-06-01 00:00 |
03:53:49.11 |
+21:05:50.6 |
HIP 18244 |
4.85 |
| 2026-06-01 12:00 |
03:53:55.00 |
+21:05:54.2 |
HIP 18244 |
3.65 |
| 2026-06-02 00:00 |
03:54:00.89 |
+21:05:57.8 |
HIP 18244 |
2.64 |