| Parameter |
Value |
| Designation |
299P/Catalina-PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-04-30T19:01:29.798400Z |
| Orbit solution date (soln_date, UTC) |
2025-09-22T13:42:25Z |
| Obs used |
880 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
16.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-03-20.0000000 |
| e |
0.28157926 |
| q (au) |
3.150195 |
| a (au) |
4.384889 |
| i (deg) |
10.475280 |
| Ω (om, deg) |
271.625782 |
| ω (w, deg) |
323.895115 |
| M (ma, deg) |
237.868045 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.310 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.310 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2022-02-05 |
2024-04-22 |
+4.3053 |
-1.815 |
| 2024-05-02 |
2025-09-19 |
+24.4776 |
-13.053 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
23:47:08.99 |
+09:08:54.0 |
HIP 117236 |
40.22 |
| 2026-06-01 12:00 |
23:47:24.67 |
+09:11:40.4 |
HIP 117236 |
39.04 |
| 2026-06-02 00:00 |
23:47:40.21 |
+09:14:26.1 |
HIP 117236 |
38.42 |
| 2026-06-02 12:00 |
23:47:55.61 |
+09:17:11.2 |
HIP 117461 |
38.05 |
| 2026-06-03 00:00 |
23:48:10.87 |
+09:19:55.6 |
HIP 117461 |
34.09 |
| 2026-06-03 12:00 |
23:48:25.99 |
+09:22:39.5 |
HIP 117461 |
30.35 |
| 2026-06-04 00:00 |
23:48:40.97 |
+09:25:22.6 |
HIP 117461 |
26.89 |
| 2026-06-04 12:00 |
23:48:55.80 |
+09:28:05.2 |
HIP 117564 |
23.55 |
| 2026-06-05 00:00 |
23:49:10.50 |
+09:30:47.1 |
HIP 117564 |
19.80 |
| 2026-06-05 12:00 |
23:49:25.04 |
+09:33:28.3 |
HIP 117564 |
16.46 |
| 2026-06-06 00:00 |
23:49:39.45 |
+09:36:08.8 |
HIP 117564 |
13.82 |
| 2026-06-06 12:00 |
23:49:53.70 |
+09:38:48.7 |
HIP 117564 |
12.30 |
| 2026-06-07 00:00 |
23:50:07.81 |
+09:41:27.9 |
HIP 117564 |
12.26 |
| 2026-06-07 12:00 |
23:50:21.77 |
+09:44:06.4 |
HIP 117564 |
13.70 |
| 2026-06-08 00:00 |
23:50:35.59 |
+09:46:44.2 |
HIP 117564 |
16.19 |
| 2026-06-08 12:00 |
23:50:49.25 |
+09:49:21.3 |
HIP 117564 |
19.31 |
| 2026-06-09 00:00 |
23:51:02.76 |
+09:51:57.7 |
HIP 117564 |
22.78 |
| 2026-06-09 12:00 |
23:51:16.12 |
+09:54:33.4 |
HIP 117564 |
26.45 |
| 2026-06-10 00:00 |
23:51:29.33 |
+09:57:08.4 |
HIP 117564 |
30.22 |
| 2026-06-10 12:00 |
23:51:42.39 |
+09:59:42.6 |
HIP 117564 |
34.05 |
| 2026-06-11 00:00 |
23:51:55.29 |
+10:02:16.1 |
HIP 117564 |
37.91 |
| 2026-06-11 12:00 |
23:52:08.03 |
+10:04:48.8 |
HIP 117564 |
41.78 |
| 2026-06-12 00:00 |
23:52:20.62 |
+10:07:20.8 |
HIP 117909 |
43.02 |
| 2026-06-12 12:00 |
23:52:33.05 |
+10:09:52.0 |
HIP 117909 |
39.17 |
| 2026-06-13 00:00 |
23:52:45.33 |
+10:12:22.4 |
HIP 117909 |
35.39 |
| 2026-06-13 12:00 |
23:52:57.44 |
+10:14:52.1 |
HIP 117909 |
31.69 |
| 2026-06-14 00:00 |
23:53:09.40 |
+10:17:20.9 |
HIP 117909 |
28.09 |
| 2026-06-14 12:00 |
23:53:21.19 |
+10:19:49.0 |
HIP 117909 |
24.59 |
| 2026-06-15 00:00 |
23:53:32.83 |
+10:22:16.2 |
HIP 117909 |
21.25 |
| 2026-06-15 12:00 |
23:53:44.30 |
+10:24:42.7 |
HIP 117909 |
18.12 |
| 2026-06-16 00:00 |
23:53:55.60 |
+10:27:08.3 |
HIP 117909 |
15.30 |
| 2026-06-16 12:00 |
23:54:06.75 |
+10:29:33.1 |
HIP 117909 |
12.96 |
| 2026-06-17 00:00 |
23:54:17.73 |
+10:31:57.1 |
HIP 117909 |
11.37 |
| 2026-06-17 12:00 |
23:54:28.54 |
+10:34:20.2 |
HIP 117909 |
10.82 |
| 2026-06-18 00:00 |
23:54:39.18 |
+10:36:42.5 |
HIP 117909 |
11.42 |
| 2026-06-18 12:00 |
23:54:49.66 |
+10:39:03.9 |
HIP 117909 |
12.98 |
| 2026-06-19 00:00 |
23:54:59.98 |
+10:41:24.5 |
HIP 117909 |
15.18 |
| 2026-06-19 12:00 |
23:55:10.12 |
+10:43:44.2 |
HIP 117909 |
17.76 |
| 2026-06-20 00:00 |
23:55:20.09 |
+10:46:03.0 |
HIP 118019 |
17.56 |
| 2026-06-20 12:00 |
23:55:29.90 |
+10:48:20.9 |
HIP 118019 |
14.33 |
| 2026-06-21 00:00 |
23:55:39.54 |
+10:50:38.0 |
HIP 118019 |
11.19 |
| 2026-06-21 12:00 |
23:55:49.00 |
+10:52:54.1 |
HIP 118019 |
8.23 |
| 2026-06-22 00:00 |
23:55:58.29 |
+10:55:09.4 |
HIP 118019 |
5.63 |