290P/Jager
| Parameter |
Value |
| Designation |
290P/Jager |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-03-14T22:45:37.206720Z |
| Orbit solution date (soln_date, UTC) |
2025-11-21T13:43:05Z |
| Obs used |
3751 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
9.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-04-01.0000000 |
| e |
0.64700621 |
| q (au) |
2.154497 |
| a (au) |
6.103499 |
| i (deg) |
19.069575 |
| Ω (om, deg) |
303.485457 |
| ω (w, deg) |
180.921262 |
| M (ma, deg) |
265.618384 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.382 + 2.657\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.382 |
| n |
2.657 |
| gf |
1.000 |
| gb |
-0.623 |
| k |
0.800 |
| 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 |
| 2012-12-01 |
2013-08-16 |
-28.0687 |
+13.202 |
| 2013-08-16 |
2014-03-14 |
+3.0509 |
-1.228 |
| 2014-03-15 |
2014-07-19 |
-28.9332 |
+9.639 |
| 2014-07-19 |
2015-04-24 |
+29.3092 |
-13.048 |
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 |
22:11:42.75 |
+00:08:15.5 |
HIP 109709 |
25.18 |
| 2026-02-03 12:00 |
22:11:57.70 |
+00:09:42.1 |
HIP 109709 |
21.20 |
| 2026-02-04 00:00 |
22:12:12.67 |
+00:11:09.3 |
HIP 109709 |
17.24 |
| 2026-02-04 12:00 |
22:12:27.66 |
+00:12:36.8 |
HIP 109709 |
13.29 |
| 2026-02-05 00:00 |
22:12:42.69 |
+00:14:04.9 |
HIP 109709 |
9.41 |
| 2026-02-05 12:00 |
22:12:57.74 |
+00:15:33.5 |
HIP 109709 |
5.73 |
| 2026-02-06 00:00 |
22:13:12.81 |
+00:17:02.5 |
HIP 109709 |
3.12 |
| 2026-02-06 12:00 |
22:13:27.91 |
+00:18:32.0 |
HIP 109709 |
4.43 |
| 2026-02-07 00:00 |
22:13:43.04 |
+00:20:02.0 |
HIP 109709 |
7.91 |
| 2026-02-07 12:00 |
22:13:58.18 |
+00:21:32.5 |
HIP 109709 |
11.78 |
| 2026-02-08 00:00 |
22:14:13.35 |
+00:23:03.4 |
HIP 109709 |
15.77 |
| 2026-02-08 12:00 |
22:14:28.55 |
+00:24:34.8 |
HIP 109709 |
19.80 |
| 2026-02-09 00:00 |
22:14:43.76 |
+00:26:06.6 |
HIP 109799 |
23.80 |
| 2026-02-09 12:00 |
22:14:58.99 |
+00:27:39.0 |
HIP 109799 |
26.38 |
| 2026-02-10 00:00 |
22:15:14.25 |
+00:29:11.7 |
HIP 109927 |
28.75 |
| 2026-02-10 12:00 |
22:15:29.52 |
+00:30:45.0 |
HIP 109913 |
27.79 |
| 2026-02-11 00:00 |
22:15:44.82 |
+00:32:18.6 |
HIP 109913 |
26.15 |
| 2026-02-11 12:00 |
22:16:00.13 |
+00:33:52.8 |
HIP 109913 |
25.10 |
| 2026-02-12 00:00 |
22:16:15.46 |
+00:35:27.3 |
HIP 109913 |
24.69 |
| 2026-02-12 12:00 |
22:16:30.81 |
+00:37:02.4 |
HIP 109913 |
24.97 |
| 2026-02-13 00:00 |
22:16:46.17 |
+00:38:37.8 |
HIP 109913 |
25.91 |
| 2026-02-13 12:00 |
22:17:01.55 |
+00:40:13.7 |
HIP 110132 |
25.43 |
| 2026-02-14 00:00 |
22:17:16.94 |
+00:41:50.0 |
HIP 110132 |
21.29 |
| 2026-02-14 12:00 |
22:17:32.35 |
+00:43:26.8 |
HIP 110132 |
17.15 |
| 2026-02-15 00:00 |
22:17:47.77 |
+00:45:04.0 |
HIP 110132 |
13.02 |
| 2026-02-15 12:00 |
22:18:03.21 |
+00:46:41.6 |
HIP 110132 |
8.95 |
| 2026-02-16 00:00 |
22:18:18.66 |
+00:48:19.6 |
HIP 110132 |
5.04 |
| 2026-02-16 12:00 |
22:18:34.12 |
+00:49:58.0 |
HIP 110132 |
2.44 |
| 2026-02-17 00:00 |
22:18:49.59 |
+00:51:36.9 |
HIP 110132 |
4.66 |
| 2026-02-17 12:00 |
22:19:05.07 |
+00:53:16.1 |
HIP 110132 |
8.54 |
| 2026-02-18 00:00 |
22:19:20.56 |
+00:54:55.8 |
HIP 110132 |
12.64 |
| 2026-02-18 12:00 |
22:19:36.07 |
+00:56:35.9 |
HIP 110132 |
16.79 |
| 2026-02-19 00:00 |
22:19:51.58 |
+00:58:16.3 |
HIP 110358 |
19.10 |
| 2026-02-19 12:00 |
22:20:07.09 |
+00:59:57.2 |
HIP 110358 |
14.99 |
| 2026-02-20 00:00 |
22:20:22.62 |
+01:01:38.5 |
HIP 110358 |
10.96 |
| 2026-02-20 12:00 |
22:20:38.15 |
+01:03:20.1 |
HIP 110358 |
7.18 |
| 2026-02-21 00:00 |
22:20:53.68 |
+01:05:02.1 |
HIP 110358 |
4.33 |
| 2026-02-21 12:00 |
22:21:09.22 |
+01:06:44.5 |
HIP 110358 |
4.69 |
| 2026-02-22 00:00 |
22:21:24.77 |
+01:08:27.3 |
HIP 110358 |
7.83 |
| 2026-02-22 12:00 |
22:21:40.32 |
+01:10:10.4 |
HIP 110358 |
11.69 |
| 2026-02-23 00:00 |
22:21:55.87 |
+01:11:53.9 |
HIP 110358 |
15.76 |
| 2026-02-23 12:00 |
22:22:11.43 |
+01:13:37.8 |
HIP 110358 |
19.91 |
| 2026-02-24 00:00 |
22:22:26.98 |
+01:15:22.1 |
HIP 110358 |
24.11 |