C/2015 R3 (PANSTARRS)
| 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 |
10.000 |
| 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) |
| 2026-02-03 00:00 |
01:10:39.22 |
+50:58:26.3 |
HIP 5512 |
2.48 |
| 2026-02-03 12:00 |
01:10:41.79 |
+50:57:58.3 |
HIP 5512 |
3.06 |
| 2026-02-04 00:00 |
01:10:44.41 |
+50:57:30.7 |
HIP 5512 |
3.65 |
| 2026-02-04 12:00 |
01:10:47.08 |
+50:57:03.5 |
HIP 5512 |
4.24 |
| 2026-02-05 00:00 |
01:10:49.80 |
+50:56:36.6 |
HIP 5512 |
4.84 |
| 2026-02-05 12:00 |
01:10:52.57 |
+50:56:10.1 |
HIP 5512 |
5.45 |
| 2026-02-06 00:00 |
01:10:55.39 |
+50:55:43.9 |
HIP 5512 |
6.06 |
| 2026-02-06 12:00 |
01:10:58.26 |
+50:55:18.1 |
HIP 5512 |
6.67 |
| 2026-02-07 00:00 |
01:11:01.19 |
+50:54:52.6 |
HIP 5512 |
7.28 |
| 2026-02-07 12:00 |
01:11:04.16 |
+50:54:27.5 |
HIP 5512 |
7.89 |
| 2026-02-08 00:00 |
01:11:07.18 |
+50:54:02.8 |
HIP 5512 |
8.51 |
| 2026-02-08 12:00 |
01:11:10.26 |
+50:53:38.4 |
HIP 5512 |
9.12 |
| 2026-02-09 00:00 |
01:11:13.38 |
+50:53:14.4 |
HIP 5512 |
9.74 |
| 2026-02-09 12:00 |
01:11:16.55 |
+50:52:50.8 |
HIP 5512 |
10.37 |
| 2026-02-10 00:00 |
01:11:19.76 |
+50:52:27.5 |
HIP 5512 |
10.99 |
| 2026-02-10 12:00 |
01:11:23.03 |
+50:52:04.7 |
HIP 5512 |
11.62 |
| 2026-02-11 00:00 |
01:11:26.34 |
+50:51:42.1 |
HIP 5512 |
12.24 |
| 2026-02-11 12:00 |
01:11:29.71 |
+50:51:20.0 |
HIP 5512 |
12.87 |
| 2026-02-12 00:00 |
01:11:33.11 |
+50:50:58.3 |
HIP 5512 |
13.51 |
| 2026-02-12 12:00 |
01:11:36.57 |
+50:50:36.9 |
HIP 5512 |
14.14 |
| 2026-02-13 00:00 |
01:11:40.07 |
+50:50:15.9 |
HIP 5512 |
14.78 |
| 2026-02-13 12:00 |
01:11:43.62 |
+50:49:55.3 |
HIP 5512 |
15.41 |
| 2026-02-14 00:00 |
01:11:47.21 |
+50:49:35.0 |
HIP 5512 |
16.05 |
| 2026-02-14 12:00 |
01:11:50.85 |
+50:49:15.2 |
HIP 5512 |
16.70 |
| 2026-02-15 00:00 |
01:11:54.54 |
+50:48:55.7 |
HIP 5512 |
17.34 |
| 2026-02-15 12:00 |
01:11:58.26 |
+50:48:36.7 |
HIP 5512 |
17.99 |
| 2026-02-16 00:00 |
01:12:02.04 |
+50:48:18.0 |
HIP 5512 |
18.64 |
| 2026-02-16 12:00 |
01:12:05.86 |
+50:47:59.7 |
HIP 5710 |
19.02 |
| 2026-02-17 00:00 |
01:12:09.72 |
+50:47:41.8 |
HIP 5710 |
18.84 |
| 2026-02-17 12:00 |
01:12:13.62 |
+50:47:24.3 |
HIP 5710 |
18.68 |
| 2026-02-18 00:00 |
01:12:17.57 |
+50:47:07.2 |
HIP 5710 |
18.53 |
| 2026-02-18 12:00 |
01:12:21.56 |
+50:46:50.5 |
HIP 5710 |
18.40 |
| 2026-02-19 00:00 |
01:12:25.59 |
+50:46:34.2 |
HIP 5710 |
18.28 |
| 2026-02-19 12:00 |
01:12:29.67 |
+50:46:18.3 |
HIP 5710 |
18.17 |
| 2026-02-20 00:00 |
01:12:33.78 |
+50:46:02.8 |
HIP 5710 |
18.09 |
| 2026-02-20 12:00 |
01:12:37.94 |
+50:45:47.8 |
HIP 5710 |
18.02 |
| 2026-02-21 00:00 |
01:12:42.14 |
+50:45:33.1 |
HIP 5710 |
17.97 |
| 2026-02-21 12:00 |
01:12:46.37 |
+50:45:18.8 |
HIP 5710 |
17.94 |
| 2026-02-22 00:00 |
01:12:50.65 |
+50:45:04.9 |
HIP 5710 |
17.93 |
| 2026-02-22 12:00 |
01:12:54.97 |
+50:44:51.4 |
HIP 5710 |
17.94 |
| 2026-02-23 00:00 |
01:12:59.32 |
+50:44:38.3 |
HIP 5710 |
17.97 |
| 2026-02-23 12:00 |
01:13:03.72 |
+50:44:25.7 |
HIP 5710 |
18.02 |
| 2026-02-24 00:00 |
01:13:08.15 |
+50:44:13.4 |
HIP 5710 |
18.09 |