299P/Catalina-PANSTARRS
| 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) |
| 2026-02-03 00:00 |
22:05:20.70 |
-03:24:37.2 |
HIP 109011 |
12.61 |
| 2026-02-03 12:00 |
22:05:51.34 |
-03:21:44.1 |
HIP 109011 |
14.68 |
| 2026-02-04 00:00 |
22:06:21.98 |
-03:18:50.5 |
HIP 109103 |
13.40 |
| 2026-02-04 12:00 |
22:06:52.62 |
-03:15:56.4 |
HIP 109103 |
15.78 |
| 2026-02-05 00:00 |
22:07:23.27 |
-03:13:01.8 |
HIP 109103 |
21.26 |
| 2026-02-05 12:00 |
22:07:53.92 |
-03:10:06.7 |
HIP 109265 |
22.23 |
| 2026-02-06 00:00 |
22:08:24.57 |
-03:07:11.1 |
HIP 109265 |
24.90 |
| 2026-02-06 12:00 |
22:08:55.22 |
-03:04:15.0 |
HIP 109265 |
29.67 |
| 2026-02-07 00:00 |
22:09:25.86 |
-03:01:18.4 |
HIP 109265 |
35.71 |
| 2026-02-07 12:00 |
22:09:56.51 |
-02:58:21.4 |
HIP 109265 |
42.49 |
| 2026-02-08 00:00 |
22:10:27.16 |
-02:55:23.9 |
HIP 109707 |
44.34 |
| 2026-02-08 12:00 |
22:10:57.80 |
-02:52:25.9 |
HIP 109707 |
36.19 |
| 2026-02-09 00:00 |
22:11:28.45 |
-02:49:27.4 |
HIP 109707 |
28.08 |
| 2026-02-09 12:00 |
22:11:59.08 |
-02:46:28.5 |
HIP 109707 |
20.05 |
| 2026-02-10 00:00 |
22:12:29.72 |
-02:43:29.1 |
HIP 109707 |
12.26 |
| 2026-02-10 12:00 |
22:13:00.35 |
-02:40:29.3 |
HIP 109707 |
5.80 |
| 2026-02-11 00:00 |
22:13:30.98 |
-02:37:29.0 |
HIP 109707 |
7.21 |
| 2026-02-11 12:00 |
22:14:01.60 |
-02:34:28.3 |
HIP 109707 |
14.34 |
| 2026-02-12 00:00 |
22:14:32.21 |
-02:31:27.1 |
HIP 109707 |
22.23 |
| 2026-02-12 12:00 |
22:15:02.82 |
-02:28:25.5 |
HIP 109934 |
21.23 |
| 2026-02-13 00:00 |
22:15:33.42 |
-02:25:23.5 |
HIP 109934 |
20.21 |
| 2026-02-13 12:00 |
22:16:04.02 |
-02:22:21.0 |
HIP 109934 |
22.41 |
| 2026-02-14 00:00 |
22:16:34.60 |
-02:19:18.1 |
HIP 109934 |
27.04 |
| 2026-02-14 12:00 |
22:17:05.18 |
-02:16:14.8 |
HIP 109860 |
33.01 |
| 2026-02-15 00:00 |
22:17:35.75 |
-02:13:11.1 |
HIP 109860 |
39.31 |
| 2026-02-15 12:00 |
22:18:06.30 |
-02:10:06.9 |
HIP 110228 |
32.18 |
| 2026-02-16 00:00 |
22:18:36.85 |
-02:07:02.4 |
HIP 110228 |
24.64 |
| 2026-02-16 12:00 |
22:19:07.38 |
-02:03:57.4 |
HIP 110228 |
17.71 |
| 2026-02-17 00:00 |
22:19:37.90 |
-02:00:52.1 |
HIP 110228 |
12.48 |
| 2026-02-17 12:00 |
22:20:08.41 |
-01:57:46.4 |
HIP 110228 |
11.54 |
| 2026-02-18 00:00 |
22:20:38.90 |
-01:54:40.2 |
HIP 110228 |
15.68 |
| 2026-02-18 12:00 |
22:21:09.39 |
-01:51:33.7 |
HIP 110228 |
22.21 |
| 2026-02-19 00:00 |
22:21:39.85 |
-01:48:26.9 |
HIP 110395 |
25.21 |
| 2026-02-19 12:00 |
22:22:10.30 |
-01:45:19.6 |
HIP 110395 |
23.40 |
| 2026-02-20 00:00 |
22:22:40.73 |
-01:42:12.0 |
HIP 110395 |
24.40 |
| 2026-02-20 12:00 |
22:23:11.15 |
-01:39:04.0 |
HIP 110594 |
20.71 |
| 2026-02-21 00:00 |
22:23:41.55 |
-01:35:55.7 |
HIP 110594 |
12.88 |
| 2026-02-21 12:00 |
22:24:11.93 |
-01:32:47.0 |
HIP 110594 |
6.15 |
| 2026-02-22 00:00 |
22:24:42.29 |
-01:29:38.0 |
HIP 110594 |
6.70 |
| 2026-02-22 12:00 |
22:25:12.64 |
-01:26:28.6 |
HIP 110594 |
13.67 |
| 2026-02-23 00:00 |
22:25:42.96 |
-01:23:18.9 |
HIP 110619 |
20.70 |
| 2026-02-23 12:00 |
22:26:13.26 |
-01:20:08.9 |
HIP 110821 |
13.45 |
| 2026-02-24 00:00 |
22:26:43.54 |
-01:16:58.5 |
HIP 110821 |
6.00 |