| 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) |
| 2026-05-12 00:00 |
22:22:18.14 |
+20:44:26.8 |
HIP 110404 |
17.00 |
| 2026-05-12 12:00 |
22:22:19.39 |
+20:45:04.6 |
HIP 110404 |
16.59 |
| 2026-05-13 00:00 |
22:22:20.60 |
+20:45:42.4 |
HIP 110404 |
16.19 |
| 2026-05-13 12:00 |
22:22:21.78 |
+20:46:20.1 |
HIP 110404 |
15.81 |
| 2026-05-14 00:00 |
22:22:22.93 |
+20:46:57.7 |
HIP 110404 |
15.45 |
| 2026-05-14 12:00 |
22:22:24.03 |
+20:47:35.1 |
HIP 110404 |
15.10 |
| 2026-05-15 00:00 |
22:22:25.11 |
+20:48:12.5 |
HIP 110404 |
14.77 |
| 2026-05-15 12:00 |
22:22:26.15 |
+20:48:49.8 |
HIP 110404 |
14.47 |
| 2026-05-16 00:00 |
22:22:27.15 |
+20:49:26.9 |
HIP 110404 |
14.18 |
| 2026-05-16 12:00 |
22:22:28.12 |
+20:50:03.9 |
HIP 110404 |
13.91 |
| 2026-05-17 00:00 |
22:22:29.05 |
+20:50:40.9 |
HIP 110404 |
13.67 |
| 2026-05-17 12:00 |
22:22:29.95 |
+20:51:17.7 |
HIP 110404 |
13.45 |
| 2026-05-18 00:00 |
22:22:30.81 |
+20:51:54.4 |
HIP 110404 |
13.24 |
| 2026-05-18 12:00 |
22:22:31.63 |
+20:52:30.9 |
HIP 110404 |
13.07 |
| 2026-05-19 00:00 |
22:22:32.42 |
+20:53:07.4 |
HIP 110404 |
12.91 |
| 2026-05-19 12:00 |
22:22:33.18 |
+20:53:43.7 |
HIP 110404 |
12.78 |
| 2026-05-20 00:00 |
22:22:33.89 |
+20:54:19.9 |
HIP 110404 |
12.67 |
| 2026-05-20 12:00 |
22:22:34.58 |
+20:54:55.9 |
HIP 110404 |
12.58 |
| 2026-05-21 00:00 |
22:22:35.22 |
+20:55:31.8 |
HIP 110404 |
12.52 |
| 2026-05-21 12:00 |
22:22:35.83 |
+20:56:07.6 |
HIP 110404 |
12.48 |
| 2026-05-22 00:00 |
22:22:36.41 |
+20:56:43.3 |
HIP 110404 |
12.46 |
| 2026-05-22 12:00 |
22:22:36.95 |
+20:57:18.8 |
HIP 110404 |
12.47 |
| 2026-05-23 00:00 |
22:22:37.45 |
+20:57:54.1 |
HIP 110404 |
12.49 |
| 2026-05-23 12:00 |
22:22:37.91 |
+20:58:29.3 |
HIP 110404 |
12.54 |
| 2026-05-24 00:00 |
22:22:38.35 |
+20:59:04.4 |
HIP 110404 |
12.61 |
| 2026-05-24 12:00 |
22:22:38.74 |
+20:59:39.3 |
HIP 110404 |
12.69 |
| 2026-05-25 00:00 |
22:22:39.10 |
+21:00:14.0 |
HIP 110404 |
12.79 |
| 2026-05-25 12:00 |
22:22:39.42 |
+21:00:48.6 |
HIP 110404 |
12.91 |
| 2026-05-26 00:00 |
22:22:39.71 |
+21:01:23.1 |
HIP 110404 |
13.05 |
| 2026-05-26 12:00 |
22:22:39.96 |
+21:01:57.3 |
HIP 110404 |
13.20 |
| 2026-05-27 00:00 |
22:22:40.17 |
+21:02:31.5 |
HIP 110404 |
13.37 |
| 2026-05-27 12:00 |
22:22:40.35 |
+21:03:05.4 |
HIP 110404 |
13.55 |
| 2026-05-28 00:00 |
22:22:40.50 |
+21:03:39.2 |
HIP 110404 |
13.74 |
| 2026-05-28 12:00 |
22:22:40.60 |
+21:04:12.8 |
HIP 110404 |
13.94 |
| 2026-05-29 00:00 |
22:22:40.67 |
+21:04:46.3 |
HIP 110404 |
14.15 |
| 2026-05-29 12:00 |
22:22:40.71 |
+21:05:19.5 |
HIP 110404 |
14.38 |
| 2026-05-30 00:00 |
22:22:40.71 |
+21:05:52.6 |
HIP 110404 |
14.61 |
| 2026-05-30 12:00 |
22:22:40.67 |
+21:06:25.6 |
HIP 110404 |
14.85 |
| 2026-05-31 00:00 |
22:22:40.60 |
+21:06:58.3 |
HIP 110404 |
15.09 |
| 2026-05-31 12:00 |
22:22:40.49 |
+21:07:30.9 |
HIP 110404 |
15.35 |
| 2026-06-01 00:00 |
22:22:40.35 |
+21:08:03.3 |
HIP 110404 |
15.61 |
| 2026-06-01 12:00 |
22:22:40.17 |
+21:08:35.5 |
HIP 110404 |
15.87 |
| 2026-06-02 00:00 |
22:22:39.95 |
+21:09:07.5 |
HIP 110404 |
16.14 |