C/2013 Y2 (PANSTARRS)
| 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
$$
M_a = (10.387 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.387 |
| n |
6.000 |
| gf |
0.868 |
| gb |
-0.666 |
| k |
0.907 |
| 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) |
| 2026-02-03 00:00 |
22:10:32.74 |
+19:01:52.1 |
HIP 109450 |
14.13 |
| 2026-02-03 12:00 |
22:10:37.19 |
+19:02:03.4 |
HIP 109450 |
14.47 |
| 2026-02-04 00:00 |
22:10:41.66 |
+19:02:15.1 |
HIP 109450 |
14.89 |
| 2026-02-04 12:00 |
22:10:46.14 |
+19:02:27.0 |
HIP 109450 |
15.38 |
| 2026-02-05 00:00 |
22:10:50.62 |
+19:02:39.3 |
HIP 109450 |
15.93 |
| 2026-02-05 12:00 |
22:10:55.11 |
+19:02:51.9 |
HIP 109450 |
16.54 |
| 2026-02-06 00:00 |
22:10:59.61 |
+19:03:04.8 |
HIP 109450 |
17.20 |
| 2026-02-06 12:00 |
22:11:04.12 |
+19:03:18.0 |
HIP 109450 |
17.91 |
| 2026-02-07 00:00 |
22:11:08.63 |
+19:03:31.5 |
HIP 109450 |
18.66 |
| 2026-02-07 12:00 |
22:11:13.15 |
+19:03:45.3 |
HIP 109450 |
19.45 |
| 2026-02-08 00:00 |
22:11:17.68 |
+19:03:59.4 |
HIP 109450 |
20.27 |
| 2026-02-08 12:00 |
22:11:22.21 |
+19:04:13.9 |
HIP 109450 |
21.12 |
| 2026-02-09 00:00 |
22:11:26.75 |
+19:04:28.6 |
HIP 109450 |
22.00 |
| 2026-02-09 12:00 |
22:11:31.30 |
+19:04:43.6 |
HIP 109450 |
22.90 |
| 2026-02-10 00:00 |
22:11:35.85 |
+19:04:59.0 |
HIP 109450 |
23.82 |
| 2026-02-10 12:00 |
22:11:40.41 |
+19:05:14.6 |
HIP 109450 |
24.76 |
| 2026-02-11 00:00 |
22:11:44.97 |
+19:05:30.5 |
HIP 109450 |
25.72 |
| 2026-02-11 12:00 |
22:11:49.54 |
+19:05:46.8 |
HIP 109450 |
26.70 |
| 2026-02-12 00:00 |
22:11:54.11 |
+19:06:03.3 |
HIP 109729 |
27.41 |
| 2026-02-12 12:00 |
22:11:58.68 |
+19:06:20.1 |
HIP 109729 |
26.57 |
| 2026-02-13 00:00 |
22:12:03.26 |
+19:06:37.3 |
HIP 109729 |
25.75 |
| 2026-02-13 12:00 |
22:12:07.84 |
+19:06:54.7 |
HIP 109729 |
24.95 |
| 2026-02-14 00:00 |
22:12:12.43 |
+19:07:12.4 |
HIP 109729 |
24.19 |
| 2026-02-14 12:00 |
22:12:17.01 |
+19:07:30.4 |
HIP 109729 |
23.45 |
| 2026-02-15 00:00 |
22:12:21.60 |
+19:07:48.7 |
HIP 109729 |
22.75 |
| 2026-02-15 12:00 |
22:12:26.20 |
+19:08:07.3 |
HIP 109729 |
22.08 |
| 2026-02-16 00:00 |
22:12:30.79 |
+19:08:26.1 |
HIP 109729 |
21.46 |
| 2026-02-16 12:00 |
22:12:35.39 |
+19:08:45.3 |
HIP 109729 |
20.88 |
| 2026-02-17 00:00 |
22:12:39.98 |
+19:09:04.7 |
HIP 109729 |
20.35 |
| 2026-02-17 12:00 |
22:12:44.58 |
+19:09:24.4 |
HIP 109729 |
19.88 |
| 2026-02-18 00:00 |
22:12:49.18 |
+19:09:44.4 |
HIP 109729 |
19.47 |
| 2026-02-18 12:00 |
22:12:53.78 |
+19:10:04.7 |
HIP 109729 |
19.12 |
| 2026-02-19 00:00 |
22:12:58.38 |
+19:10:25.3 |
HIP 109729 |
18.83 |
| 2026-02-19 12:00 |
22:13:02.98 |
+19:10:46.1 |
HIP 109729 |
18.61 |
| 2026-02-20 00:00 |
22:13:07.58 |
+19:11:07.2 |
HIP 109729 |
18.47 |
| 2026-02-20 12:00 |
22:13:12.18 |
+19:11:28.6 |
HIP 109729 |
18.40 |
| 2026-02-21 00:00 |
22:13:16.77 |
+19:11:50.2 |
HIP 109729 |
18.41 |
| 2026-02-21 12:00 |
22:13:21.37 |
+19:12:12.2 |
HIP 109729 |
18.49 |
| 2026-02-22 00:00 |
22:13:25.96 |
+19:12:34.4 |
HIP 109729 |
18.65 |
| 2026-02-22 12:00 |
22:13:30.55 |
+19:12:56.8 |
HIP 109729 |
18.87 |
| 2026-02-23 00:00 |
22:13:35.14 |
+19:13:19.5 |
HIP 109729 |
19.17 |
| 2026-02-23 12:00 |
22:13:39.73 |
+19:13:42.5 |
HIP 109729 |
19.54 |
| 2026-02-24 00:00 |
22:13:44.31 |
+19:14:05.8 |
HIP 109729 |
19.97 |