| Parameter |
Value |
| Designation |
C/2015 R3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-02-11T21:36:17.124480Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:21Z |
| Obs used |
41 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-07-26.0000000 |
| e |
0.99867972 |
| q (au) |
4.902904 |
| a (au) |
3713.532087 |
| i (deg) |
83.610000 |
| Ω (om, deg) |
36.413320 |
| ω (w, deg) |
272.016706 |
| M (ma, deg) |
0.002304 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.213 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.213 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.837 |
| k |
0.800 |
| δ90 |
9.997 |
| 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) |
| 2026-09-20 00:00 |
01:26:25.67 |
+54:46:19.8 |
HIP 6667 |
13.40 |
| 2026-09-20 12:00 |
01:26:18.71 |
+54:46:32.1 |
HIP 6667 |
12.69 |
| 2026-09-21 00:00 |
01:26:11.71 |
+54:46:43.9 |
HIP 6667 |
12.02 |
| 2026-09-21 12:00 |
01:26:04.69 |
+54:46:55.2 |
HIP 6667 |
11.42 |
| 2026-09-22 00:00 |
01:25:57.63 |
+54:47:06.1 |
HIP 6667 |
10.88 |
| 2026-09-22 12:00 |
01:25:50.55 |
+54:47:16.5 |
HIP 6667 |
10.43 |
| 2026-09-23 00:00 |
01:25:43.44 |
+54:47:26.4 |
HIP 6667 |
10.07 |
| 2026-09-23 12:00 |
01:25:36.31 |
+54:47:35.9 |
HIP 6611 |
9.44 |
| 2026-09-24 00:00 |
01:25:29.14 |
+54:47:44.9 |
HIP 6611 |
8.67 |
| 2026-09-24 12:00 |
01:25:21.95 |
+54:47:53.4 |
HIP 6611 |
7.98 |
| 2026-09-25 00:00 |
01:25:14.74 |
+54:48:01.5 |
HIP 6611 |
7.37 |
| 2026-09-25 12:00 |
01:25:07.50 |
+54:48:09.1 |
HIP 6611 |
6.87 |
| 2026-09-26 00:00 |
01:25:00.24 |
+54:48:16.2 |
HIP 6611 |
6.51 |
| 2026-09-26 12:00 |
01:24:52.95 |
+54:48:22.8 |
HIP 6611 |
6.32 |
| 2026-09-27 00:00 |
01:24:45.64 |
+54:48:29.0 |
HIP 6611 |
6.31 |
| 2026-09-27 12:00 |
01:24:38.31 |
+54:48:34.7 |
HIP 6611 |
6.49 |
| 2026-09-28 00:00 |
01:24:30.96 |
+54:48:40.0 |
HIP 6611 |
6.83 |
| 2026-09-28 12:00 |
01:24:23.58 |
+54:48:44.7 |
HIP 6611 |
7.32 |
| 2026-09-29 00:00 |
01:24:16.19 |
+54:48:49.0 |
HIP 6611 |
7.93 |
| 2026-09-29 12:00 |
01:24:08.77 |
+54:48:52.8 |
HIP 6611 |
8.64 |
| 2026-09-30 00:00 |
01:24:01.33 |
+54:48:56.1 |
HIP 6611 |
9.43 |
| 2026-09-30 12:00 |
01:23:53.88 |
+54:48:59.0 |
HIP 6611 |
10.27 |
| 2026-10-01 00:00 |
01:23:46.41 |
+54:49:01.4 |
HIP 6611 |
11.16 |
| 2026-10-01 12:00 |
01:23:38.92 |
+54:49:03.3 |
HIP 6611 |
12.08 |
| 2026-10-02 00:00 |
01:23:31.41 |
+54:49:04.7 |
HIP 6611 |
13.04 |
| 2026-10-02 12:00 |
01:23:23.88 |
+54:49:05.7 |
HIP 6611 |
14.01 |
| 2026-10-03 00:00 |
01:23:16.34 |
+54:49:06.1 |
HIP 6611 |
15.01 |
| 2026-10-03 12:00 |
01:23:08.78 |
+54:49:06.1 |
HIP 6611 |
16.03 |
| 2026-10-04 00:00 |
01:23:01.21 |
+54:49:05.6 |
HIP 6611 |
17.05 |
| 2026-10-04 12:00 |
01:22:53.63 |
+54:49:04.7 |
HIP 6611 |
18.09 |
| 2026-10-05 00:00 |
01:22:46.03 |
+54:49:03.3 |
HIP 6311 |
18.54 |
| 2026-10-05 12:00 |
01:22:38.41 |
+54:49:01.3 |
HIP 6311 |
17.67 |
| 2026-10-06 00:00 |
01:22:30.79 |
+54:48:59.0 |
HIP 6311 |
16.81 |
| 2026-10-06 12:00 |
01:22:23.15 |
+54:48:56.1 |
HIP 6311 |
15.97 |
| 2026-10-07 00:00 |
01:22:15.50 |
+54:48:52.7 |
HIP 6311 |
15.16 |
| 2026-10-07 12:00 |
01:22:07.85 |
+54:48:48.9 |
HIP 6311 |
14.39 |
| 2026-10-08 00:00 |
01:22:00.18 |
+54:48:44.6 |
HIP 6311 |
13.65 |
| 2026-10-08 12:00 |
01:21:52.50 |
+54:48:39.8 |
HIP 6311 |
12.96 |
| 2026-10-09 00:00 |
01:21:44.82 |
+54:48:34.6 |
HIP 6311 |
12.32 |
| 2026-10-09 12:00 |
01:21:37.13 |
+54:48:28.8 |
HIP 6311 |
11.75 |
| 2026-10-10 00:00 |
01:21:29.43 |
+54:48:22.6 |
HIP 6311 |
11.25 |
| 2026-10-10 12:00 |
01:21:21.72 |
+54:48:16.0 |
HIP 6311 |
10.84 |
| 2026-10-11 00:00 |
01:21:14.01 |
+54:48:08.8 |
HIP 6311 |
10.51 |