134P/Kowal-Vavrova
| Parameter |
Value |
| Designation |
134P/Kowal-Vavrova |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-05-21T10:44:38.575680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:38Z |
| Obs used |
1061 |
| NEO |
- |
| M1 |
5.300 |
| K1 |
21.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-07-03.0000000 |
| e |
0.58715335 |
| q (au) |
2.571725 |
| a (au) |
6.229249 |
| i (deg) |
4.348711 |
| Ω (om, deg) |
202.123430 |
| ω (w, deg) |
18.560225 |
| M (ma, deg) |
339.558643 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.233 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.233 |
| n |
6.000 |
| gf |
0.888 |
| gb |
-0.500 |
| k |
0.907 |
| δ90 |
1.569 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2013-01-17 |
2013-08-04 |
+16.7678 |
-10.380 |
| 2013-08-04 |
2014-05-21 |
-10.4881 |
+4.217 |
| 2014-05-21 |
2015-09-08 |
+8.7935 |
-3.959 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:25:10.55 |
+17:59:40.9 |
HIP 20648 |
6.00 |
| 2026-02-03 12:00 |
04:25:07.55 |
+17:59:44.4 |
HIP 20648 |
6.58 |
| 2026-02-04 00:00 |
04:25:04.69 |
+17:59:48.2 |
HIP 20648 |
7.16 |
| 2026-02-04 12:00 |
04:25:01.96 |
+17:59:52.4 |
HIP 20648 |
7.74 |
| 2026-02-05 00:00 |
04:24:59.36 |
+17:59:56.9 |
HIP 20648 |
8.30 |
| 2026-02-05 12:00 |
04:24:56.90 |
+18:00:01.8 |
HIP 20648 |
8.85 |
| 2026-02-06 00:00 |
04:24:54.58 |
+18:00:06.9 |
HIP 20563 |
8.97 |
| 2026-02-06 12:00 |
04:24:52.39 |
+18:00:12.5 |
HIP 20563 |
8.44 |
| 2026-02-07 00:00 |
04:24:50.33 |
+18:00:18.4 |
HIP 20563 |
7.96 |
| 2026-02-07 12:00 |
04:24:48.41 |
+18:00:24.6 |
HIP 20563 |
7.50 |
| 2026-02-08 00:00 |
04:24:46.63 |
+18:00:31.1 |
HIP 20563 |
7.08 |
| 2026-02-08 12:00 |
04:24:44.98 |
+18:00:38.0 |
HIP 20563 |
6.70 |
| 2026-02-09 00:00 |
04:24:43.47 |
+18:00:45.2 |
HIP 20563 |
6.35 |
| 2026-02-09 12:00 |
04:24:42.09 |
+18:00:52.8 |
HIP 20563 |
6.04 |
| 2026-02-10 00:00 |
04:24:40.85 |
+18:01:00.7 |
HIP 20563 |
5.76 |
| 2026-02-10 12:00 |
04:24:39.74 |
+18:01:08.9 |
HIP 20563 |
5.52 |
| 2026-02-11 00:00 |
04:24:38.77 |
+18:01:17.5 |
HIP 20563 |
5.32 |
| 2026-02-11 12:00 |
04:24:37.94 |
+18:01:26.4 |
HIP 20563 |
5.17 |
| 2026-02-12 00:00 |
04:24:37.24 |
+18:01:35.6 |
HIP 20563 |
5.05 |
| 2026-02-12 12:00 |
04:24:36.68 |
+18:01:45.2 |
HIP 20563 |
4.97 |
| 2026-02-13 00:00 |
04:24:36.26 |
+18:01:55.1 |
HIP 20563 |
4.93 |
| 2026-02-13 12:00 |
04:24:35.97 |
+18:02:05.3 |
HIP 20563 |
4.93 |
| 2026-02-14 00:00 |
04:24:35.82 |
+18:02:15.9 |
HIP 20563 |
4.96 |
| 2026-02-14 12:00 |
04:24:35.80 |
+18:02:26.8 |
HIP 20563 |
5.04 |
| 2026-02-15 00:00 |
04:24:35.92 |
+18:02:38.0 |
HIP 20563 |
5.15 |
| 2026-02-15 12:00 |
04:24:36.18 |
+18:02:49.5 |
HIP 20563 |
5.30 |
| 2026-02-16 00:00 |
04:24:36.57 |
+18:03:01.3 |
HIP 20563 |
5.48 |
| 2026-02-16 12:00 |
04:24:37.09 |
+18:03:13.5 |
HIP 20563 |
5.69 |
| 2026-02-17 00:00 |
04:24:37.76 |
+18:03:26.0 |
HIP 20563 |
5.94 |
| 2026-02-17 12:00 |
04:24:38.56 |
+18:03:38.8 |
HIP 20563 |
6.21 |
| 2026-02-18 00:00 |
04:24:39.49 |
+18:03:51.9 |
HIP 20563 |
6.52 |
| 2026-02-18 12:00 |
04:24:40.56 |
+18:04:05.3 |
HIP 20563 |
6.85 |
| 2026-02-19 00:00 |
04:24:41.76 |
+18:04:19.1 |
HIP 20563 |
7.22 |
| 2026-02-19 12:00 |
04:24:43.10 |
+18:04:33.1 |
HIP 20563 |
7.62 |
| 2026-02-20 00:00 |
04:24:44.57 |
+18:04:47.5 |
HIP 20563 |
8.04 |
| 2026-02-20 12:00 |
04:24:46.18 |
+18:05:02.1 |
HIP 20563 |
8.49 |
| 2026-02-21 00:00 |
04:24:47.93 |
+18:05:17.1 |
HIP 20563 |
8.97 |
| 2026-02-21 12:00 |
04:24:49.80 |
+18:05:32.4 |
HIP 20563 |
9.49 |
| 2026-02-22 00:00 |
04:24:51.81 |
+18:05:47.9 |
HIP 20563 |
10.03 |
| 2026-02-22 12:00 |
04:24:53.95 |
+18:06:03.8 |
HIP 20563 |
10.60 |
| 2026-02-23 00:00 |
04:24:56.23 |
+18:06:19.9 |
HIP 20563 |
11.20 |
| 2026-02-23 12:00 |
04:24:58.64 |
+18:06:36.4 |
HIP 20563 |
11.83 |
| 2026-02-24 00:00 |
04:25:01.18 |
+18:06:53.1 |
HIP 20679 |
12.46 |