| 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) |
| 2026-05-12 00:00 |
01:28:01.39 |
+51:30:31.8 |
HIP 6911 |
14.08 |
| 2026-05-12 12:00 |
01:28:06.95 |
+51:31:15.7 |
HIP 6911 |
12.96 |
| 2026-05-13 00:00 |
01:28:12.48 |
+51:32:00.0 |
HIP 6911 |
11.84 |
| 2026-05-13 12:00 |
01:28:17.99 |
+51:32:44.3 |
HIP 6911 |
10.73 |
| 2026-05-14 00:00 |
01:28:23.48 |
+51:33:29.0 |
HIP 6911 |
9.62 |
| 2026-05-14 12:00 |
01:28:28.94 |
+51:34:13.9 |
HIP 6911 |
8.51 |
| 2026-05-15 00:00 |
01:28:34.38 |
+51:34:59.0 |
HIP 6911 |
7.41 |
| 2026-05-15 12:00 |
01:28:39.79 |
+51:35:44.4 |
HIP 6911 |
6.33 |
| 2026-05-16 00:00 |
01:28:45.18 |
+51:36:30.0 |
HIP 6911 |
5.25 |
| 2026-05-16 12:00 |
01:28:50.54 |
+51:37:15.8 |
HIP 6911 |
4.21 |
| 2026-05-17 00:00 |
01:28:55.87 |
+51:38:01.9 |
HIP 6911 |
3.22 |
| 2026-05-17 12:00 |
01:29:01.18 |
+51:38:48.2 |
HIP 6911 |
2.36 |
| 2026-05-18 00:00 |
01:29:06.46 |
+51:39:34.7 |
HIP 6911 |
1.82 |
| 2026-05-18 12:00 |
01:29:11.71 |
+51:40:21.4 |
HIP 6911 |
1.88 |
| 2026-05-19 00:00 |
01:29:16.93 |
+51:41:08.4 |
HIP 6911 |
2.51 |
| 2026-05-19 12:00 |
01:29:22.13 |
+51:41:55.5 |
HIP 6911 |
3.40 |
| 2026-05-20 00:00 |
01:29:27.29 |
+51:42:42.9 |
HIP 6911 |
4.39 |
| 2026-05-20 12:00 |
01:29:32.43 |
+51:43:30.4 |
HIP 6911 |
5.44 |
| 2026-05-21 00:00 |
01:29:37.54 |
+51:44:18.2 |
HIP 6911 |
6.50 |
| 2026-05-21 12:00 |
01:29:42.61 |
+51:45:06.2 |
HIP 6911 |
7.58 |
| 2026-05-22 00:00 |
01:29:47.66 |
+51:45:54.4 |
HIP 6911 |
8.67 |
| 2026-05-22 12:00 |
01:29:52.68 |
+51:46:42.8 |
HIP 6911 |
9.77 |
| 2026-05-23 00:00 |
01:29:57.66 |
+51:47:31.4 |
HIP 6911 |
10.86 |
| 2026-05-23 12:00 |
01:30:02.62 |
+51:48:20.1 |
HIP 6911 |
11.96 |
| 2026-05-24 00:00 |
01:30:07.54 |
+51:49:09.1 |
HIP 6911 |
13.06 |
| 2026-05-24 12:00 |
01:30:12.43 |
+51:49:58.2 |
HIP 6889 |
13.97 |
| 2026-05-25 00:00 |
01:30:17.29 |
+51:50:47.6 |
HIP 6889 |
14.55 |
| 2026-05-25 12:00 |
01:30:22.12 |
+51:51:37.1 |
HIP 6889 |
15.18 |
| 2026-05-26 00:00 |
01:30:26.91 |
+51:52:26.8 |
HIP 6889 |
15.87 |
| 2026-05-26 12:00 |
01:30:31.67 |
+51:53:16.7 |
HIP 6889 |
16.59 |
| 2026-05-27 00:00 |
01:30:36.40 |
+51:54:06.7 |
HIP 6889 |
17.35 |
| 2026-05-27 12:00 |
01:30:41.09 |
+51:54:56.9 |
HIP 6889 |
18.13 |
| 2026-05-28 00:00 |
01:30:45.75 |
+51:55:47.3 |
HIP 6889 |
18.95 |
| 2026-05-28 12:00 |
01:30:50.37 |
+51:56:37.9 |
HIP 6889 |
19.79 |
| 2026-05-29 00:00 |
01:30:54.96 |
+51:57:28.6 |
HIP 6889 |
20.65 |
| 2026-05-29 12:00 |
01:30:59.52 |
+51:58:19.5 |
HIP 6889 |
21.52 |
| 2026-05-30 00:00 |
01:31:04.04 |
+51:59:10.5 |
HIP 6889 |
22.41 |
| 2026-05-30 12:00 |
01:31:08.52 |
+52:00:01.8 |
HIP 6889 |
23.31 |
| 2026-05-31 00:00 |
01:31:12.97 |
+52:00:53.1 |
HIP 6889 |
24.23 |
| 2026-05-31 12:00 |
01:31:17.38 |
+52:01:44.6 |
HIP 6889 |
25.15 |
| 2026-06-01 00:00 |
01:31:21.76 |
+52:02:36.3 |
HIP 6889 |
26.09 |
| 2026-06-01 12:00 |
01:31:26.10 |
+52:03:28.1 |
HIP 7138 |
25.22 |
| 2026-06-02 00:00 |
01:31:30.40 |
+52:04:20.1 |
HIP 7138 |
24.24 |