| Parameter |
Value |
| Designation |
265P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2003-09-05T19:24:38.289600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:10Z |
| Obs used |
539 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
14.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-10-14.0000000 |
| e |
0.64602512 |
| q (au) |
1.505450 |
| a (au) |
4.252984 |
| i (deg) |
14.691189 |
| Ω (om, deg) |
344.711232 |
| ω (w, deg) |
32.720499 |
| M (ma, deg) |
4.291677 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.883 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.883 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-1.000 |
| 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) |
| 2026-03-26 00:00 |
13:24:15.80 |
-20:45:20.0 |
HIP 65381 |
11.04 |
| 2026-03-26 12:00 |
13:24:01.21 |
-20:44:33.9 |
HIP 65381 |
10.95 |
| 2026-03-27 00:00 |
13:23:46.55 |
-20:43:46.8 |
HIP 65381 |
11.95 |
| 2026-03-27 12:00 |
13:23:31.83 |
-20:42:58.9 |
HIP 65381 |
13.82 |
| 2026-03-28 00:00 |
13:23:17.05 |
-20:42:10.0 |
HIP 65381 |
16.27 |
| 2026-03-28 12:00 |
13:23:02.20 |
-20:41:20.3 |
HIP 65381 |
19.09 |
| 2026-03-29 00:00 |
13:22:47.31 |
-20:40:29.7 |
HIP 65381 |
22.15 |
| 2026-03-29 12:00 |
13:22:32.35 |
-20:39:38.2 |
HIP 65381 |
25.36 |
| 2026-03-30 00:00 |
13:22:17.35 |
-20:38:45.8 |
HIP 65101 |
28.67 |
| 2026-03-30 12:00 |
13:22:02.29 |
-20:37:52.5 |
HIP 65101 |
26.16 |
| 2026-03-31 00:00 |
13:21:47.18 |
-20:36:58.4 |
HIP 65101 |
23.94 |
| 2026-03-31 12:00 |
13:21:32.02 |
-20:36:03.5 |
HIP 65101 |
22.11 |
| 2026-04-01 00:00 |
13:21:16.82 |
-20:35:07.7 |
HIP 65101 |
20.77 |
| 2026-04-01 12:00 |
13:21:01.58 |
-20:34:11.0 |
HIP 65101 |
20.03 |
| 2026-04-02 00:00 |
13:20:46.29 |
-20:33:13.6 |
HIP 65101 |
19.96 |
| 2026-04-02 12:00 |
13:20:30.96 |
-20:32:15.3 |
HIP 65101 |
20.59 |
| 2026-04-03 00:00 |
13:20:15.60 |
-20:31:16.1 |
HIP 65101 |
21.86 |
| 2026-04-03 12:00 |
13:20:00.20 |
-20:30:16.2 |
HIP 65101 |
23.66 |
| 2026-04-04 00:00 |
13:19:44.76 |
-20:29:15.5 |
HIP 65101 |
25.90 |
| 2026-04-04 12:00 |
13:19:29.29 |
-20:28:14.0 |
HIP 65101 |
28.47 |
| 2026-04-05 00:00 |
13:19:13.80 |
-20:27:11.6 |
HIP 64981 |
27.07 |
| 2026-04-05 12:00 |
13:18:58.27 |
-20:26:08.5 |
HIP 64981 |
25.98 |
| 2026-04-06 00:00 |
13:18:42.72 |
-20:25:04.7 |
HIP 64981 |
25.40 |
| 2026-04-06 12:00 |
13:18:27.14 |
-20:24:00.1 |
HIP 64981 |
25.37 |
| 2026-04-07 00:00 |
13:18:11.55 |
-20:22:54.7 |
HIP 64981 |
25.90 |
| 2026-04-07 12:00 |
13:17:55.93 |
-20:21:48.6 |
HIP 64981 |
26.96 |
| 2026-04-08 00:00 |
13:17:40.29 |
-20:20:41.7 |
HIP 64981 |
28.50 |
| 2026-04-08 12:00 |
13:17:24.64 |
-20:19:34.1 |
HIP 64981 |
30.43 |
| 2026-04-09 00:00 |
13:17:08.98 |
-20:18:25.8 |
HIP 64725 |
27.40 |
| 2026-04-09 12:00 |
13:16:53.30 |
-20:17:16.8 |
HIP 64725 |
24.37 |
| 2026-04-10 00:00 |
13:16:37.61 |
-20:16:07.1 |
HIP 64725 |
21.59 |
| 2026-04-10 12:00 |
13:16:21.92 |
-20:14:56.7 |
HIP 64725 |
19.18 |
| 2026-04-11 00:00 |
13:16:06.22 |
-20:13:45.6 |
HIP 64725 |
17.28 |
| 2026-04-11 12:00 |
13:15:50.51 |
-20:12:33.9 |
HIP 64725 |
16.11 |
| 2026-04-12 00:00 |
13:15:34.81 |
-20:11:21.5 |
HIP 64725 |
15.81 |
| 2026-04-12 12:00 |
13:15:19.10 |
-20:10:08.5 |
HIP 64725 |
16.44 |
| 2026-04-13 00:00 |
13:15:03.40 |
-20:08:54.8 |
HIP 64725 |
17.90 |
| 2026-04-13 12:00 |
13:14:47.70 |
-20:07:40.5 |
HIP 64577 |
14.61 |
| 2026-04-14 00:00 |
13:14:32.02 |
-20:06:25.6 |
HIP 64577 |
11.65 |
| 2026-04-14 12:00 |
13:14:16.34 |
-20:05:10.1 |
HIP 64577 |
9.37 |
| 2026-04-15 00:00 |
13:14:00.67 |
-20:03:54.0 |
HIP 64577 |
8.38 |
| 2026-04-15 12:00 |
13:13:45.01 |
-20:02:37.3 |
HIP 64577 |
9.09 |
| 2026-04-16 00:00 |
13:13:29.37 |
-20:01:20.1 |
HIP 64577 |
11.19 |