| 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 |
0.993 |
| gb |
-0.507 |
| 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) |
| 2026-07-29 00:00 |
12:57:09.56 |
-16:57:25.8 |
HIP 63134 |
15.39 |
| 2026-07-29 12:00 |
12:57:18.48 |
-16:57:47.4 |
HIP 63178 |
17.10 |
| 2026-07-30 00:00 |
12:57:27.51 |
-16:58:09.8 |
HIP 63178 |
18.68 |
| 2026-07-30 12:00 |
12:57:36.65 |
-16:58:33.0 |
HIP 63178 |
20.40 |
| 2026-07-31 00:00 |
12:57:45.90 |
-16:58:57.0 |
HIP 63178 |
22.24 |
| 2026-07-31 12:00 |
12:57:55.25 |
-16:59:21.9 |
HIP 63178 |
24.17 |
| 2026-08-01 00:00 |
12:58:04.72 |
-16:59:47.5 |
HIP 63248 |
24.90 |
| 2026-08-01 12:00 |
12:58:14.29 |
-17:00:14.0 |
HIP 63248 |
25.23 |
| 2026-08-02 00:00 |
12:58:23.97 |
-17:00:41.2 |
HIP 63248 |
25.76 |
| 2026-08-02 12:00 |
12:58:33.76 |
-17:01:09.3 |
HIP 63248 |
26.50 |
| 2026-08-03 00:00 |
12:58:43.65 |
-17:01:38.2 |
HIP 63248 |
27.42 |
| 2026-08-03 12:00 |
12:58:53.64 |
-17:02:07.9 |
HIP 63248 |
28.53 |
| 2026-08-04 00:00 |
12:59:03.74 |
-17:02:38.3 |
HIP 63248 |
29.81 |
| 2026-08-04 12:00 |
12:59:13.95 |
-17:03:09.6 |
HIP 63248 |
31.23 |
| 2026-08-05 00:00 |
12:59:24.26 |
-17:03:41.7 |
HIP 63393 |
31.68 |
| 2026-08-05 12:00 |
12:59:34.67 |
-17:04:14.5 |
HIP 63393 |
32.29 |
| 2026-08-06 00:00 |
12:59:45.19 |
-17:04:48.2 |
HIP 63393 |
33.10 |
| 2026-08-06 12:00 |
12:59:55.81 |
-17:05:22.6 |
HIP 63393 |
34.10 |
| 2026-08-07 00:00 |
13:00:06.53 |
-17:05:57.9 |
HIP 63501 |
33.86 |
| 2026-08-07 12:00 |
13:00:17.35 |
-17:06:33.9 |
HIP 63501 |
32.73 |
| 2026-08-08 00:00 |
13:00:28.27 |
-17:07:10.6 |
HIP 63501 |
31.77 |
| 2026-08-08 12:00 |
13:00:39.29 |
-17:07:48.2 |
HIP 63501 |
30.99 |
| 2026-08-09 00:00 |
13:00:50.41 |
-17:08:26.6 |
HIP 63501 |
30.43 |
| 2026-08-09 12:00 |
13:01:01.63 |
-17:09:05.7 |
HIP 63501 |
30.09 |
| 2026-08-10 00:00 |
13:01:12.95 |
-17:09:45.6 |
HIP 63501 |
30.00 |
| 2026-08-10 12:00 |
13:01:24.36 |
-17:10:26.2 |
HIP 63672 |
28.35 |
| 2026-08-11 00:00 |
13:01:35.88 |
-17:11:07.6 |
HIP 63672 |
26.71 |
| 2026-08-11 12:00 |
13:01:47.49 |
-17:11:49.8 |
HIP 63672 |
25.28 |
| 2026-08-12 00:00 |
13:01:59.19 |
-17:12:32.7 |
HIP 63672 |
24.10 |
| 2026-08-12 12:00 |
13:02:10.99 |
-17:13:16.4 |
HIP 63672 |
23.23 |
| 2026-08-13 00:00 |
13:02:22.89 |
-17:14:00.9 |
HIP 63672 |
22.69 |
| 2026-08-13 12:00 |
13:02:34.88 |
-17:14:46.1 |
HIP 63672 |
22.54 |
| 2026-08-14 00:00 |
13:02:46.96 |
-17:15:32.0 |
HIP 63775 |
22.06 |
| 2026-08-14 12:00 |
13:02:59.14 |
-17:16:18.7 |
HIP 63775 |
19.23 |
| 2026-08-15 00:00 |
13:03:11.40 |
-17:17:06.1 |
HIP 63775 |
16.44 |
| 2026-08-15 12:00 |
13:03:23.76 |
-17:17:54.3 |
HIP 63775 |
13.73 |
| 2026-08-16 00:00 |
13:03:36.21 |
-17:18:43.2 |
HIP 63775 |
11.20 |
| 2026-08-16 12:00 |
13:03:48.75 |
-17:19:32.8 |
HIP 63775 |
9.00 |
| 2026-08-17 00:00 |
13:04:01.38 |
-17:20:23.1 |
HIP 63775 |
7.48 |
| 2026-08-17 12:00 |
13:04:14.09 |
-17:21:14.2 |
HIP 63775 |
7.10 |
| 2026-08-18 00:00 |
13:04:26.90 |
-17:22:05.9 |
HIP 63775 |
8.07 |
| 2026-08-18 12:00 |
13:04:39.79 |
-17:22:58.4 |
HIP 63775 |
10.02 |
| 2026-08-19 00:00 |
13:04:52.76 |
-17:23:51.6 |
HIP 63775 |
12.52 |