| Parameter |
Value |
| Designation |
C/2013 Y2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-13T15:29:33.463680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:44Z |
| Obs used |
436 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
15.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-03-11.0000000 |
| e |
0.99127402 |
| q (au) |
1.919085 |
| a (au) |
219.927835 |
| i (deg) |
29.414744 |
| Ω (om, deg) |
243.400925 |
| ω (w, deg) |
308.841643 |
| M (ma, deg) |
359.971399 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.343 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.343 |
| n |
6.000 |
| gf |
0.855 |
| gb |
-0.679 |
| k |
0.919 |
| δ90 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
22:18:03.63 |
+19:44:07.3 |
HIP 110159 |
17.01 |
| 2026-03-26 12:00 |
22:18:07.52 |
+19:44:42.9 |
HIP 110159 |
15.99 |
| 2026-03-27 00:00 |
22:18:11.39 |
+19:45:18.6 |
HIP 110159 |
14.98 |
| 2026-03-27 12:00 |
22:18:15.25 |
+19:45:54.4 |
HIP 110159 |
13.99 |
| 2026-03-28 00:00 |
22:18:19.08 |
+19:46:30.4 |
HIP 110159 |
13.01 |
| 2026-03-28 12:00 |
22:18:22.89 |
+19:47:06.5 |
HIP 110159 |
12.04 |
| 2026-03-29 00:00 |
22:18:26.69 |
+19:47:42.7 |
HIP 110159 |
11.10 |
| 2026-03-29 12:00 |
22:18:30.46 |
+19:48:19.0 |
HIP 110159 |
10.19 |
| 2026-03-30 00:00 |
22:18:34.21 |
+19:48:55.5 |
HIP 110159 |
9.31 |
| 2026-03-30 12:00 |
22:18:37.94 |
+19:49:32.1 |
HIP 110159 |
8.47 |
| 2026-03-31 00:00 |
22:18:41.65 |
+19:50:08.8 |
HIP 110159 |
7.69 |
| 2026-03-31 12:00 |
22:18:45.34 |
+19:50:45.6 |
HIP 110159 |
6.99 |
| 2026-04-01 00:00 |
22:18:49.01 |
+19:51:22.5 |
HIP 110159 |
6.38 |
| 2026-04-01 12:00 |
22:18:52.66 |
+19:51:59.5 |
HIP 110159 |
5.90 |
| 2026-04-02 00:00 |
22:18:56.28 |
+19:52:36.7 |
HIP 110159 |
5.57 |
| 2026-04-02 12:00 |
22:18:59.88 |
+19:53:13.9 |
HIP 110159 |
5.43 |
| 2026-04-03 00:00 |
22:19:03.46 |
+19:53:51.3 |
HIP 110159 |
5.48 |
| 2026-04-03 12:00 |
22:19:07.02 |
+19:54:28.7 |
HIP 110159 |
5.72 |
| 2026-04-04 00:00 |
22:19:10.55 |
+19:55:06.3 |
HIP 110159 |
6.13 |
| 2026-04-04 12:00 |
22:19:14.06 |
+19:55:44.0 |
HIP 110159 |
6.67 |
| 2026-04-05 00:00 |
22:19:17.55 |
+19:56:21.7 |
HIP 110159 |
7.31 |
| 2026-04-05 12:00 |
22:19:21.02 |
+19:56:59.5 |
HIP 110159 |
8.03 |
| 2026-04-06 00:00 |
22:19:24.46 |
+19:57:37.5 |
HIP 110159 |
8.80 |
| 2026-04-06 12:00 |
22:19:27.88 |
+19:58:15.5 |
HIP 110159 |
9.62 |
| 2026-04-07 00:00 |
22:19:31.27 |
+19:58:53.6 |
HIP 110159 |
10.47 |
| 2026-04-07 12:00 |
22:19:34.64 |
+19:59:31.8 |
HIP 110159 |
11.34 |
| 2026-04-08 00:00 |
22:19:37.98 |
+20:00:10.1 |
HIP 110159 |
12.22 |
| 2026-04-08 12:00 |
22:19:41.30 |
+20:00:48.4 |
HIP 110159 |
13.12 |
| 2026-04-09 00:00 |
22:19:44.60 |
+20:01:26.9 |
HIP 110159 |
14.03 |
| 2026-04-09 12:00 |
22:19:47.87 |
+20:02:05.4 |
HIP 110159 |
14.95 |
| 2026-04-10 00:00 |
22:19:51.12 |
+20:02:43.9 |
HIP 110159 |
15.87 |
| 2026-04-10 12:00 |
22:19:54.34 |
+20:03:22.6 |
HIP 110159 |
16.79 |
| 2026-04-11 00:00 |
22:19:57.53 |
+20:04:01.3 |
HIP 110159 |
17.72 |
| 2026-04-11 12:00 |
22:20:00.70 |
+20:04:40.1 |
HIP 110159 |
18.65 |
| 2026-04-12 00:00 |
22:20:03.84 |
+20:05:18.9 |
HIP 110159 |
19.58 |
| 2026-04-12 12:00 |
22:20:06.96 |
+20:05:57.8 |
HIP 110159 |
20.50 |
| 2026-04-13 00:00 |
22:20:10.05 |
+20:06:36.8 |
HIP 110159 |
21.43 |
| 2026-04-13 12:00 |
22:20:13.11 |
+20:07:15.8 |
HIP 110159 |
22.36 |
| 2026-04-14 00:00 |
22:20:16.15 |
+20:07:54.9 |
HIP 110159 |
23.28 |
| 2026-04-14 12:00 |
22:20:19.16 |
+20:08:34.0 |
HIP 110159 |
24.20 |
| 2026-04-15 00:00 |
22:20:22.14 |
+20:09:13.2 |
HIP 110159 |
25.12 |
| 2026-04-15 12:00 |
22:20:25.09 |
+20:09:52.4 |
HIP 110159 |
26.04 |
| 2026-04-16 00:00 |
22:20:28.02 |
+20:10:31.6 |
HIP 110159 |
26.95 |