| Parameter |
Value |
| Designation |
C/2014 W6 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-19T00:07:11.818560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:03Z |
| Obs used |
139 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-01-30.0000000 |
| e |
1.00174154 |
| q (au) |
3.087625 |
| a (au) |
-1772.929151 |
| i (deg) |
53.564298 |
| Ω (om, deg) |
338.129791 |
| ω (w, deg) |
209.854804 |
| M (ma, deg) |
-0.000634 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.657 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.657 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
22:36:15.22 |
-18:17:29.1 |
HIP 111603 |
5.27 |
| 2026-05-12 12:00 |
22:36:16.60 |
-18:17:26.3 |
HIP 111603 |
4.94 |
| 2026-05-13 00:00 |
22:36:17.94 |
-18:17:23.7 |
HIP 111603 |
4.62 |
| 2026-05-13 12:00 |
22:36:19.25 |
-18:17:21.4 |
HIP 111603 |
4.31 |
| 2026-05-14 00:00 |
22:36:20.53 |
-18:17:19.3 |
HIP 111603 |
4.00 |
| 2026-05-14 12:00 |
22:36:21.76 |
-18:17:17.4 |
HIP 111603 |
3.71 |
| 2026-05-15 00:00 |
22:36:22.96 |
-18:17:15.7 |
HIP 111603 |
3.43 |
| 2026-05-15 12:00 |
22:36:24.12 |
-18:17:14.3 |
HIP 111603 |
3.16 |
| 2026-05-16 00:00 |
22:36:25.25 |
-18:17:13.1 |
HIP 111603 |
2.90 |
| 2026-05-16 12:00 |
22:36:26.34 |
-18:17:12.2 |
HIP 111603 |
2.65 |
| 2026-05-17 00:00 |
22:36:27.39 |
-18:17:11.5 |
HIP 111603 |
2.42 |
| 2026-05-17 12:00 |
22:36:28.40 |
-18:17:11.0 |
HIP 111603 |
2.19 |
| 2026-05-18 00:00 |
22:36:29.38 |
-18:17:10.7 |
HIP 111603 |
1.98 |
| 2026-05-18 12:00 |
22:36:30.32 |
-18:17:10.7 |
HIP 111603 |
1.78 |
| 2026-05-19 00:00 |
22:36:31.22 |
-18:17:10.9 |
HIP 111603 |
1.60 |
| 2026-05-19 12:00 |
22:36:32.09 |
-18:17:11.3 |
HIP 111603 |
1.44 |
| 2026-05-20 00:00 |
22:36:32.92 |
-18:17:12.0 |
HIP 111603 |
1.30 |
| 2026-05-20 12:00 |
22:36:33.71 |
-18:17:12.8 |
HIP 111603 |
1.19 |
| 2026-05-21 00:00 |
22:36:34.46 |
-18:17:13.9 |
HIP 111603 |
1.10 |
| 2026-05-21 12:00 |
22:36:35.18 |
-18:17:15.3 |
HIP 111603 |
1.05 |
| 2026-05-22 00:00 |
22:36:35.85 |
-18:17:16.9 |
HIP 111603 |
1.02 |
| 2026-05-22 12:00 |
22:36:36.49 |
-18:17:18.6 |
HIP 111603 |
1.03 |
| 2026-05-23 00:00 |
22:36:37.09 |
-18:17:20.7 |
HIP 111603 |
1.06 |
| 2026-05-23 12:00 |
22:36:37.66 |
-18:17:22.9 |
HIP 111603 |
1.12 |
| 2026-05-24 00:00 |
22:36:38.19 |
-18:17:25.4 |
HIP 111603 |
1.19 |
| 2026-05-24 12:00 |
22:36:38.67 |
-18:17:28.0 |
HIP 111603 |
1.26 |
| 2026-05-25 00:00 |
22:36:39.13 |
-18:17:31.0 |
HIP 111603 |
1.35 |
| 2026-05-25 12:00 |
22:36:39.54 |
-18:17:34.1 |
HIP 111603 |
1.44 |
| 2026-05-26 00:00 |
22:36:39.91 |
-18:17:37.4 |
HIP 111603 |
1.53 |
| 2026-05-26 12:00 |
22:36:40.25 |
-18:17:41.0 |
HIP 111603 |
1.62 |
| 2026-05-27 00:00 |
22:36:40.55 |
-18:17:44.8 |
HIP 111603 |
1.71 |
| 2026-05-27 12:00 |
22:36:40.81 |
-18:17:48.8 |
HIP 111603 |
1.80 |
| 2026-05-28 00:00 |
22:36:41.03 |
-18:17:53.0 |
HIP 111603 |
1.89 |
| 2026-05-28 12:00 |
22:36:41.22 |
-18:17:57.5 |
HIP 111603 |
1.97 |
| 2026-05-29 00:00 |
22:36:41.37 |
-18:18:02.2 |
HIP 111603 |
2.06 |
| 2026-05-29 12:00 |
22:36:41.48 |
-18:18:07.0 |
HIP 111603 |
2.14 |
| 2026-05-30 00:00 |
22:36:41.55 |
-18:18:12.1 |
HIP 111603 |
2.22 |
| 2026-05-30 12:00 |
22:36:41.58 |
-18:18:17.4 |
HIP 111603 |
2.30 |
| 2026-05-31 00:00 |
22:36:41.58 |
-18:18:23.0 |
HIP 111603 |
2.38 |
| 2026-05-31 12:00 |
22:36:41.53 |
-18:18:28.7 |
HIP 111603 |
2.46 |
| 2026-06-01 00:00 |
22:36:41.45 |
-18:18:34.6 |
HIP 111603 |
2.55 |
| 2026-06-01 12:00 |
22:36:41.33 |
-18:18:40.8 |
HIP 111603 |
2.63 |
| 2026-06-02 00:00 |
22:36:41.18 |
-18:18:47.2 |
HIP 111603 |
2.71 |