265P/LINEAR
| 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) |
| 2026-02-03 00:00 |
13:39:02.30 |
-20:38:24.0 |
HIP 66759 |
28.27 |
| 2026-02-03 12:00 |
13:39:00.86 |
-20:39:14.7 |
HIP 66759 |
28.42 |
| 2026-02-04 00:00 |
13:38:59.26 |
-20:40:04.6 |
HIP 66759 |
28.63 |
| 2026-02-04 12:00 |
13:38:57.52 |
-20:40:53.7 |
HIP 66759 |
28.90 |
| 2026-02-05 00:00 |
13:38:55.61 |
-20:41:42.0 |
HIP 66759 |
29.24 |
| 2026-02-05 12:00 |
13:38:53.56 |
-20:42:29.5 |
HIP 66759 |
29.65 |
| 2026-02-06 00:00 |
13:38:51.35 |
-20:43:16.2 |
HIP 66759 |
30.11 |
| 2026-02-06 12:00 |
13:38:48.98 |
-20:44:02.0 |
HIP 66759 |
30.63 |
| 2026-02-07 00:00 |
13:38:46.47 |
-20:44:47.0 |
HIP 66759 |
31.20 |
| 2026-02-07 12:00 |
13:38:43.79 |
-20:45:31.2 |
HIP 66759 |
31.83 |
| 2026-02-08 00:00 |
13:38:40.96 |
-20:46:14.6 |
HIP 66759 |
32.51 |
| 2026-02-08 12:00 |
13:38:37.98 |
-20:46:57.1 |
HIP 66759 |
33.24 |
| 2026-02-09 00:00 |
13:38:34.85 |
-20:47:38.8 |
HIP 66759 |
34.02 |
| 2026-02-09 12:00 |
13:38:31.55 |
-20:48:19.6 |
HIP 66759 |
34.85 |
| 2026-02-10 00:00 |
13:38:28.11 |
-20:48:59.5 |
HIP 66759 |
35.72 |
| 2026-02-10 12:00 |
13:38:24.50 |
-20:49:38.6 |
HIP 66759 |
36.63 |
| 2026-02-11 00:00 |
13:38:20.75 |
-20:50:16.9 |
HIP 66759 |
37.59 |
| 2026-02-11 12:00 |
13:38:16.83 |
-20:50:54.2 |
HIP 66759 |
38.58 |
| 2026-02-12 00:00 |
13:38:12.77 |
-20:51:30.7 |
HIP 66759 |
39.62 |
| 2026-02-12 12:00 |
13:38:08.55 |
-20:52:06.3 |
HIP 66759 |
40.69 |
| 2026-02-13 00:00 |
13:38:04.17 |
-20:52:41.0 |
HIP 66759 |
41.80 |
| 2026-02-13 12:00 |
13:37:59.64 |
-20:53:14.8 |
HIP 66759 |
42.95 |
| 2026-02-14 00:00 |
13:37:54.95 |
-20:53:47.7 |
HIP 66489 |
43.97 |
| 2026-02-14 12:00 |
13:37:50.11 |
-20:54:19.7 |
HIP 66489 |
44.48 |
| 2026-02-15 00:00 |
13:37:45.12 |
-20:54:50.8 |
HIP 66489 |
45.01 |
| 2026-02-15 12:00 |
13:37:39.97 |
-20:55:21.0 |
HIP 66489 |
45.56 |
| 2026-02-16 00:00 |
13:37:34.66 |
-20:55:50.3 |
HIP 66489 |
46.12 |
| 2026-02-16 12:00 |
13:37:29.21 |
-20:56:18.6 |
HIP 66407 |
46.68 |
| 2026-02-17 00:00 |
13:37:23.60 |
-20:56:46.0 |
HIP 66407 |
46.00 |
| 2026-02-17 12:00 |
13:37:17.83 |
-20:57:12.5 |
HIP 66407 |
45.37 |
| 2026-02-18 00:00 |
13:37:11.92 |
-20:57:38.1 |
HIP 66407 |
44.78 |
| 2026-02-18 12:00 |
13:37:05.85 |
-20:58:02.7 |
HIP 66407 |
44.24 |
| 2026-02-19 00:00 |
13:36:59.63 |
-20:58:26.4 |
HIP 66407 |
43.76 |
| 2026-02-19 12:00 |
13:36:53.26 |
-20:58:49.2 |
HIP 66407 |
43.35 |
| 2026-02-20 00:00 |
13:36:46.74 |
-20:59:11.0 |
HIP 66407 |
43.00 |
| 2026-02-20 12:00 |
13:36:40.07 |
-20:59:31.9 |
HIP 66407 |
42.72 |
| 2026-02-21 00:00 |
13:36:33.25 |
-20:59:51.8 |
HIP 66407 |
42.52 |
| 2026-02-21 12:00 |
13:36:26.28 |
-21:00:10.7 |
HIP 66407 |
42.40 |
| 2026-02-22 00:00 |
13:36:19.16 |
-21:00:28.7 |
HIP 66407 |
42.37 |
| 2026-02-22 12:00 |
13:36:11.89 |
-21:00:45.7 |
HIP 66407 |
42.42 |
| 2026-02-23 00:00 |
13:36:04.48 |
-21:01:01.8 |
HIP 66407 |
42.57 |
| 2026-02-23 12:00 |
13:35:56.92 |
-21:01:16.9 |
HIP 66407 |
42.82 |
| 2026-02-24 00:00 |
13:35:49.21 |
-21:01:31.1 |
HIP 66407 |
43.17 |