| Parameter |
Value |
| Designation |
C/2014 J1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-20T00:22:18.560640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:54Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-05-17.0000000 |
| e |
0.80239339 |
| q (au) |
1.708541 |
| a (au) |
8.646176 |
| i (deg) |
159.696475 |
| Ω (om, deg) |
41.942129 |
| ω (w, deg) |
195.480026 |
| M (ma, deg) |
358.681304 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.181 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.181 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.553 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
01:51:41.59 |
+16:12:39.8 |
HIP 8667 |
11.30 |
| 2026-06-01 12:00 |
01:51:46.08 |
+16:13:14.1 |
HIP 8667 |
10.86 |
| 2026-06-02 00:00 |
01:51:50.53 |
+16:13:48.2 |
HIP 8667 |
10.55 |
| 2026-06-02 12:00 |
01:51:54.95 |
+16:14:22.3 |
HIP 8667 |
10.37 |
| 2026-06-03 00:00 |
01:51:59.33 |
+16:14:56.2 |
HIP 8667 |
10.32 |
| 2026-06-03 12:00 |
01:52:03.68 |
+16:15:30.0 |
HIP 8667 |
10.41 |
| 2026-06-04 00:00 |
01:52:07.99 |
+16:16:03.6 |
HIP 8667 |
10.63 |
| 2026-06-04 12:00 |
01:52:12.27 |
+16:16:37.1 |
HIP 8667 |
10.96 |
| 2026-06-05 00:00 |
01:52:16.50 |
+16:17:10.4 |
HIP 8667 |
11.40 |
| 2026-06-05 12:00 |
01:52:20.70 |
+16:17:43.6 |
HIP 8667 |
11.93 |
| 2026-06-06 00:00 |
01:52:24.86 |
+16:18:16.6 |
HIP 8667 |
12.53 |
| 2026-06-06 12:00 |
01:52:28.99 |
+16:18:49.5 |
HIP 8667 |
13.20 |
| 2026-06-07 00:00 |
01:52:33.07 |
+16:19:22.3 |
HIP 8667 |
13.92 |
| 2026-06-07 12:00 |
01:52:37.12 |
+16:19:54.8 |
HIP 8667 |
14.68 |
| 2026-06-08 00:00 |
01:52:41.12 |
+16:20:27.3 |
HIP 8667 |
15.48 |
| 2026-06-08 12:00 |
01:52:45.09 |
+16:20:59.5 |
HIP 8667 |
16.30 |
| 2026-06-09 00:00 |
01:52:49.02 |
+16:21:31.6 |
HIP 8667 |
17.15 |
| 2026-06-09 12:00 |
01:52:52.90 |
+16:22:03.6 |
HIP 8667 |
18.01 |
| 2026-06-10 00:00 |
01:52:56.75 |
+16:22:35.4 |
HIP 8667 |
18.88 |
| 2026-06-10 12:00 |
01:53:00.56 |
+16:23:07.0 |
HIP 8667 |
19.76 |
| 2026-06-11 00:00 |
01:53:04.32 |
+16:23:38.4 |
HIP 8667 |
20.65 |
| 2026-06-11 12:00 |
01:53:08.04 |
+16:24:09.7 |
HIP 8667 |
21.54 |
| 2026-06-12 00:00 |
01:53:11.72 |
+16:24:40.8 |
HIP 8667 |
22.43 |
| 2026-06-12 12:00 |
01:53:15.36 |
+16:25:11.7 |
HIP 8667 |
23.32 |
| 2026-06-13 00:00 |
01:53:18.95 |
+16:25:42.4 |
HIP 8667 |
24.22 |
| 2026-06-13 12:00 |
01:53:22.50 |
+16:26:13.0 |
HIP 8667 |
25.11 |
| 2026-06-14 00:00 |
01:53:26.01 |
+16:26:43.3 |
HIP 8667 |
25.99 |
| 2026-06-14 12:00 |
01:53:29.47 |
+16:27:13.5 |
HIP 8667 |
26.87 |
| 2026-06-15 00:00 |
01:53:32.89 |
+16:27:43.5 |
HIP 8667 |
27.75 |
| 2026-06-15 12:00 |
01:53:36.26 |
+16:28:13.3 |
HIP 8667 |
28.62 |
| 2026-06-16 00:00 |
01:53:39.59 |
+16:28:43.0 |
HIP 8667 |
29.49 |
| 2026-06-16 12:00 |
01:53:42.87 |
+16:29:12.4 |
HIP 8667 |
30.35 |
| 2026-06-17 00:00 |
01:53:46.11 |
+16:29:41.6 |
HIP 8667 |
31.20 |
| 2026-06-17 12:00 |
01:53:49.30 |
+16:30:10.6 |
HIP 8667 |
32.04 |
| 2026-06-18 00:00 |
01:53:52.44 |
+16:30:39.5 |
HIP 8667 |
32.87 |
| 2026-06-18 12:00 |
01:53:55.54 |
+16:31:08.1 |
HIP 8667 |
33.70 |
| 2026-06-19 00:00 |
01:53:58.59 |
+16:31:36.5 |
HIP 8816 |
33.68 |
| 2026-06-19 12:00 |
01:54:01.59 |
+16:32:04.7 |
HIP 8816 |
33.44 |
| 2026-06-20 00:00 |
01:54:04.55 |
+16:32:32.8 |
HIP 8816 |
33.21 |
| 2026-06-20 12:00 |
01:54:07.45 |
+16:33:00.6 |
HIP 8816 |
33.00 |
| 2026-06-21 00:00 |
01:54:10.31 |
+16:33:28.1 |
HIP 8816 |
32.82 |
| 2026-06-21 12:00 |
01:54:13.12 |
+16:33:55.5 |
HIP 8816 |
32.65 |
| 2026-06-22 00:00 |
01:54:15.88 |
+16:34:22.7 |
HIP 8816 |
32.49 |