| 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 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
22:56:03.35 |
+02:00:36.8 |
HIP 113315 |
27.36 |
| 2026-03-26 12:00 |
22:56:31.40 |
+02:03:58.8 |
HIP 113315 |
28.06 |
| 2026-03-27 00:00 |
22:56:59.40 |
+02:07:20.8 |
HIP 113315 |
30.77 |
| 2026-03-27 12:00 |
22:57:27.34 |
+02:10:42.9 |
HIP 113315 |
35.03 |
| 2026-03-28 00:00 |
22:57:55.23 |
+02:14:05.1 |
HIP 113572 |
36.15 |
| 2026-03-28 12:00 |
22:58:23.06 |
+02:17:27.2 |
HIP 113572 |
28.55 |
| 2026-03-29 00:00 |
22:58:50.84 |
+02:20:49.4 |
HIP 113572 |
21.06 |
| 2026-03-29 12:00 |
22:59:18.57 |
+02:24:11.6 |
HIP 113572 |
13.83 |
| 2026-03-30 00:00 |
22:59:46.23 |
+02:27:33.9 |
HIP 113572 |
7.60 |
| 2026-03-30 12:00 |
23:00:13.85 |
+02:30:56.1 |
HIP 113572 |
6.52 |
| 2026-03-31 00:00 |
23:00:41.40 |
+02:34:18.4 |
HIP 113572 |
12.04 |
| 2026-03-31 12:00 |
23:01:08.90 |
+02:37:40.7 |
HIP 113572 |
19.09 |
| 2026-04-01 00:00 |
23:01:36.33 |
+02:41:03.0 |
HIP 113622 |
23.77 |
| 2026-04-01 12:00 |
23:02:03.72 |
+02:44:25.2 |
HIP 113622 |
25.94 |
| 2026-04-02 00:00 |
23:02:31.04 |
+02:47:47.5 |
HIP 113879 |
21.63 |
| 2026-04-02 12:00 |
23:02:58.30 |
+02:51:09.8 |
HIP 113879 |
18.71 |
| 2026-04-03 00:00 |
23:03:25.50 |
+02:54:32.1 |
HIP 113879 |
18.65 |
| 2026-04-03 12:00 |
23:03:52.65 |
+02:57:54.3 |
HIP 113913 |
19.95 |
| 2026-04-04 00:00 |
23:04:19.73 |
+03:01:16.6 |
HIP 113913 |
16.73 |
| 2026-04-04 12:00 |
23:04:46.75 |
+03:04:38.8 |
HIP 113913 |
16.60 |
| 2026-04-05 00:00 |
23:05:13.71 |
+03:08:01.0 |
HIP 113913 |
19.61 |
| 2026-04-05 12:00 |
23:05:40.61 |
+03:11:23.1 |
HIP 114148 |
22.08 |
| 2026-04-06 00:00 |
23:06:07.45 |
+03:14:45.2 |
HIP 114148 |
18.03 |
| 2026-04-06 12:00 |
23:06:34.22 |
+03:18:07.3 |
HIP 114148 |
16.58 |
| 2026-04-07 00:00 |
23:07:00.93 |
+03:21:29.4 |
HIP 114233 |
16.50 |
| 2026-04-07 12:00 |
23:07:27.58 |
+03:24:51.4 |
HIP 114233 |
11.03 |
| 2026-04-08 00:00 |
23:07:54.16 |
+03:28:13.3 |
HIP 114228 |
6.45 |
| 2026-04-08 12:00 |
23:08:20.68 |
+03:31:35.2 |
HIP 114228 |
5.49 |
| 2026-04-09 00:00 |
23:08:47.13 |
+03:34:57.0 |
HIP 114228 |
11.34 |
| 2026-04-09 12:00 |
23:09:13.51 |
+03:38:18.8 |
HIP 114357 |
11.00 |
| 2026-04-10 00:00 |
23:09:39.83 |
+03:41:40.5 |
HIP 114357 |
5.64 |
| 2026-04-10 12:00 |
23:10:06.08 |
+03:45:02.1 |
HIP 114357 |
7.15 |
| 2026-04-11 00:00 |
23:10:32.26 |
+03:48:23.7 |
HIP 114357 |
13.35 |
| 2026-04-11 12:00 |
23:10:58.38 |
+03:51:45.1 |
HIP 114357 |
20.32 |
| 2026-04-12 00:00 |
23:11:24.42 |
+03:55:06.5 |
HIP 114513 |
20.75 |
| 2026-04-12 12:00 |
23:11:50.39 |
+03:58:27.8 |
HIP 114513 |
17.26 |
| 2026-04-13 00:00 |
23:12:16.30 |
+04:01:49.0 |
HIP 114513 |
16.48 |
| 2026-04-13 12:00 |
23:12:42.13 |
+04:05:10.0 |
HIP 114513 |
18.72 |
| 2026-04-14 00:00 |
23:13:07.89 |
+04:08:31.0 |
HIP 114513 |
23.11 |
| 2026-04-14 12:00 |
23:13:33.58 |
+04:11:51.9 |
HIP 114513 |
28.66 |
| 2026-04-15 00:00 |
23:13:59.19 |
+04:15:12.6 |
HIP 114513 |
34.82 |
| 2026-04-15 12:00 |
23:14:24.74 |
+04:18:33.2 |
HIP 114513 |
41.29 |
| 2026-04-16 00:00 |
23:14:50.20 |
+04:21:53.7 |
HIP 114983 |
37.39 |