| 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
$$
M_a = (8.015 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.015 |
| n |
2.000 |
| gf |
0.897 |
| gb |
-0.935 |
| k |
1.000 |
| δ90 |
4.434 |
| 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) |
| 2026-07-29 00:00 |
04:02:54.95 |
+21:05:42.0 |
HIP 18976 |
14.79 |
| 2026-07-29 12:00 |
04:02:57.79 |
+21:05:36.3 |
HIP 18976 |
14.12 |
| 2026-07-30 00:00 |
04:03:00.58 |
+21:05:30.4 |
HIP 18976 |
13.46 |
| 2026-07-30 12:00 |
04:03:03.34 |
+21:05:24.4 |
HIP 18976 |
12.81 |
| 2026-07-31 00:00 |
04:03:06.05 |
+21:05:18.3 |
HIP 18976 |
12.17 |
| 2026-07-31 12:00 |
04:03:08.72 |
+21:05:12.1 |
HIP 18976 |
11.54 |
| 2026-08-01 00:00 |
04:03:11.34 |
+21:05:05.8 |
HIP 18976 |
10.92 |
| 2026-08-01 12:00 |
04:03:13.92 |
+21:04:59.3 |
HIP 18976 |
10.32 |
| 2026-08-02 00:00 |
04:03:16.47 |
+21:04:52.7 |
HIP 18976 |
9.72 |
| 2026-08-02 12:00 |
04:03:18.96 |
+21:04:46.0 |
HIP 18976 |
9.13 |
| 2026-08-03 00:00 |
04:03:21.42 |
+21:04:39.1 |
HIP 18976 |
8.55 |
| 2026-08-03 12:00 |
04:03:23.83 |
+21:04:32.1 |
HIP 18976 |
7.98 |
| 2026-08-04 00:00 |
04:03:26.19 |
+21:04:25.0 |
HIP 18976 |
7.43 |
| 2026-08-04 12:00 |
04:03:28.52 |
+21:04:17.8 |
HIP 18976 |
6.89 |
| 2026-08-05 00:00 |
04:03:30.80 |
+21:04:10.4 |
HIP 18976 |
6.35 |
| 2026-08-05 12:00 |
04:03:33.03 |
+21:04:02.9 |
HIP 18976 |
5.84 |
| 2026-08-06 00:00 |
04:03:35.22 |
+21:03:55.3 |
HIP 18976 |
5.33 |
| 2026-08-06 12:00 |
04:03:37.37 |
+21:03:47.5 |
HIP 18976 |
4.84 |
| 2026-08-07 00:00 |
04:03:39.47 |
+21:03:39.6 |
HIP 18976 |
4.37 |
| 2026-08-07 12:00 |
04:03:41.53 |
+21:03:31.6 |
HIP 18976 |
3.92 |
| 2026-08-08 00:00 |
04:03:43.54 |
+21:03:23.4 |
HIP 18976 |
3.49 |
| 2026-08-08 12:00 |
04:03:45.50 |
+21:03:15.1 |
HIP 18976 |
3.09 |
| 2026-08-09 00:00 |
04:03:47.42 |
+21:03:06.7 |
HIP 18976 |
2.73 |
| 2026-08-09 12:00 |
04:03:49.29 |
+21:02:58.1 |
HIP 18976 |
2.41 |
| 2026-08-10 00:00 |
04:03:51.12 |
+21:02:49.4 |
HIP 18976 |
2.16 |
| 2026-08-10 12:00 |
04:03:52.90 |
+21:02:40.6 |
HIP 18976 |
1.98 |
| 2026-08-11 00:00 |
04:03:54.64 |
+21:02:31.6 |
HIP 18976 |
1.90 |
| 2026-08-11 12:00 |
04:03:56.33 |
+21:02:22.5 |
HIP 18976 |
1.92 |
| 2026-08-12 00:00 |
04:03:57.97 |
+21:02:13.3 |
HIP 18976 |
2.03 |
| 2026-08-12 12:00 |
04:03:59.56 |
+21:02:03.9 |
HIP 18976 |
2.22 |
| 2026-08-13 00:00 |
04:04:01.11 |
+21:01:54.4 |
HIP 18976 |
2.46 |
| 2026-08-13 12:00 |
04:04:02.61 |
+21:01:44.7 |
HIP 18976 |
2.73 |
| 2026-08-14 00:00 |
04:04:04.07 |
+21:01:35.0 |
HIP 18976 |
3.02 |
| 2026-08-14 12:00 |
04:04:05.47 |
+21:01:25.0 |
HIP 18976 |
3.33 |
| 2026-08-15 00:00 |
04:04:06.83 |
+21:01:15.0 |
HIP 18976 |
3.64 |
| 2026-08-15 12:00 |
04:04:08.14 |
+21:01:04.8 |
HIP 18976 |
3.96 |
| 2026-08-16 00:00 |
04:04:09.40 |
+21:00:54.4 |
HIP 18976 |
4.27 |
| 2026-08-16 12:00 |
04:04:10.62 |
+21:00:43.9 |
HIP 18976 |
4.59 |
| 2026-08-17 00:00 |
04:04:11.78 |
+21:00:33.3 |
HIP 18976 |
4.90 |
| 2026-08-17 12:00 |
04:04:12.90 |
+21:00:22.5 |
HIP 18976 |
5.21 |
| 2026-08-18 00:00 |
04:04:13.97 |
+21:00:11.6 |
HIP 18976 |
5.51 |
| 2026-08-18 12:00 |
04:04:14.99 |
+21:00:00.6 |
HIP 18976 |
5.80 |
| 2026-08-19 00:00 |
04:04:15.97 |
+20:59:49.4 |
HIP 18976 |
6.10 |