| Parameter |
Value |
| Designation |
269P/Jedicke |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-11-25T22:04:56.112960Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:27Z |
| Obs used |
904 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
12.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2009-11-07.0000000 |
| e |
0.43469217 |
| q (au) |
4.077250 |
| a (au) |
7.212443 |
| i (deg) |
6.611643 |
| Ω (om, deg) |
248.991032 |
| ω (w, deg) |
223.915918 |
| M (ma, deg) |
266.123247 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.141 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.141 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.932 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2012-09-11 |
2013-11-03 |
+7.2265 |
-4.196 |
| 2013-11-03 |
2014-11-25 |
+12.8920 |
-8.168 |
| 2014-12-14 |
2016-03-13 |
+7.6679 |
-4.901 |
| 2016-03-13 |
2017-03-21 |
+16.4470 |
-11.763 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
20:51:58.77 |
-10:47:35.1 |
HIP 102975 |
28.69 |
| 2026-05-12 12:00 |
20:51:59.73 |
-10:47:07.4 |
HIP 102975 |
28.25 |
| 2026-05-13 00:00 |
20:52:00.60 |
-10:46:40.1 |
HIP 102975 |
27.83 |
| 2026-05-13 12:00 |
20:52:01.36 |
-10:46:13.2 |
HIP 102975 |
27.40 |
| 2026-05-14 00:00 |
20:52:02.02 |
-10:45:46.7 |
HIP 102975 |
26.99 |
| 2026-05-14 12:00 |
20:52:02.58 |
-10:45:20.7 |
HIP 102975 |
26.58 |
| 2026-05-15 00:00 |
20:52:03.04 |
-10:44:55.0 |
HIP 102975 |
26.17 |
| 2026-05-15 12:00 |
20:52:03.40 |
-10:44:29.8 |
HIP 102975 |
25.77 |
| 2026-05-16 00:00 |
20:52:03.66 |
-10:44:05.0 |
HIP 102975 |
25.37 |
| 2026-05-16 12:00 |
20:52:03.82 |
-10:43:40.5 |
HIP 102975 |
24.97 |
| 2026-05-17 00:00 |
20:52:03.88 |
-10:43:16.6 |
HIP 102975 |
24.58 |
| 2026-05-17 12:00 |
20:52:03.84 |
-10:42:53.0 |
HIP 102975 |
24.19 |
| 2026-05-18 00:00 |
20:52:03.70 |
-10:42:29.8 |
HIP 102975 |
23.81 |
| 2026-05-18 12:00 |
20:52:03.46 |
-10:42:07.1 |
HIP 102975 |
23.42 |
| 2026-05-19 00:00 |
20:52:03.11 |
-10:41:44.8 |
HIP 102975 |
23.04 |
| 2026-05-19 12:00 |
20:52:02.67 |
-10:41:23.0 |
HIP 102975 |
22.66 |
| 2026-05-20 00:00 |
20:52:02.13 |
-10:41:01.5 |
HIP 102975 |
22.29 |
| 2026-05-20 12:00 |
20:52:01.49 |
-10:40:40.5 |
HIP 102975 |
21.92 |
| 2026-05-21 00:00 |
20:52:00.75 |
-10:40:20.0 |
HIP 102975 |
21.55 |
| 2026-05-21 12:00 |
20:51:59.91 |
-10:39:59.8 |
HIP 102975 |
21.19 |
| 2026-05-22 00:00 |
20:51:58.97 |
-10:39:40.1 |
HIP 102975 |
20.83 |
| 2026-05-22 12:00 |
20:51:57.93 |
-10:39:20.8 |
HIP 102975 |
20.48 |
| 2026-05-23 00:00 |
20:51:56.79 |
-10:39:02.0 |
HIP 102975 |
20.13 |
| 2026-05-23 12:00 |
20:51:55.55 |
-10:38:43.6 |
HIP 102975 |
19.80 |
| 2026-05-24 00:00 |
20:51:54.21 |
-10:38:25.7 |
HIP 102975 |
19.47 |
| 2026-05-24 12:00 |
20:51:52.77 |
-10:38:08.1 |
HIP 102975 |
19.15 |
| 2026-05-25 00:00 |
20:51:51.24 |
-10:37:51.1 |
HIP 102975 |
18.84 |
| 2026-05-25 12:00 |
20:51:49.60 |
-10:37:34.4 |
HIP 102975 |
18.55 |
| 2026-05-26 00:00 |
20:51:47.87 |
-10:37:18.2 |
HIP 102975 |
18.27 |
| 2026-05-26 12:00 |
20:51:46.04 |
-10:37:02.5 |
HIP 102975 |
18.01 |
| 2026-05-27 00:00 |
20:51:44.11 |
-10:36:47.2 |
HIP 102975 |
17.77 |
| 2026-05-27 12:00 |
20:51:42.08 |
-10:36:32.3 |
HIP 102975 |
17.55 |
| 2026-05-28 00:00 |
20:51:39.96 |
-10:36:17.9 |
HIP 102975 |
17.36 |
| 2026-05-28 12:00 |
20:51:37.74 |
-10:36:03.9 |
HIP 102975 |
17.19 |
| 2026-05-29 00:00 |
20:51:35.42 |
-10:35:50.4 |
HIP 102975 |
17.06 |
| 2026-05-29 12:00 |
20:51:33.00 |
-10:35:37.3 |
HIP 102975 |
16.95 |
| 2026-05-30 00:00 |
20:51:30.49 |
-10:35:24.6 |
HIP 102975 |
16.89 |
| 2026-05-30 12:00 |
20:51:27.88 |
-10:35:12.5 |
HIP 102975 |
16.86 |
| 2026-05-31 00:00 |
20:51:25.17 |
-10:35:00.7 |
HIP 102975 |
16.88 |
| 2026-05-31 12:00 |
20:51:22.37 |
-10:34:49.4 |
HIP 102975 |
16.94 |
| 2026-06-01 00:00 |
20:51:19.47 |
-10:34:38.6 |
HIP 102975 |
17.04 |
| 2026-06-01 12:00 |
20:51:16.47 |
-10:34:28.2 |
HIP 102975 |
17.20 |
| 2026-06-02 00:00 |
20:51:13.38 |
-10:34:18.3 |
HIP 102975 |
17.40 |