| 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
$$
M_a = (13.382 + 2.659\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.382 |
| n |
2.659 |
| gf |
0.999 |
| 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 |
2013-08-17 |
-29.8986 |
+14.031 |
| 2013-08-17 |
2014-03-14 |
+3.1233 |
-1.256 |
| 2014-03-15 |
2015-04-24 |
+13.6416 |
-4.843 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
22:57:06.11 |
+09:34:09.8 |
HIP 113445 |
25.32 |
| 2026-07-29 12:00 |
22:56:56.84 |
+09:34:23.7 |
HIP 113445 |
27.42 |
| 2026-07-30 00:00 |
22:56:47.46 |
+09:34:36.5 |
HIP 113180 |
25.72 |
| 2026-07-30 12:00 |
22:56:37.97 |
+09:34:48.4 |
HIP 113180 |
23.54 |
| 2026-07-31 00:00 |
22:56:28.38 |
+09:34:59.2 |
HIP 113180 |
21.36 |
| 2026-07-31 12:00 |
22:56:18.68 |
+09:35:09.0 |
HIP 113180 |
19.20 |
| 2026-08-01 00:00 |
22:56:08.88 |
+09:35:17.8 |
HIP 113180 |
17.07 |
| 2026-08-01 12:00 |
22:55:58.98 |
+09:35:25.7 |
HIP 113180 |
15.00 |
| 2026-08-02 00:00 |
22:55:48.98 |
+09:35:32.4 |
HIP 113180 |
13.03 |
| 2026-08-02 12:00 |
22:55:38.87 |
+09:35:38.2 |
HIP 113180 |
11.23 |
| 2026-08-03 00:00 |
22:55:28.67 |
+09:35:43.0 |
HIP 113180 |
9.71 |
| 2026-08-03 12:00 |
22:55:18.36 |
+09:35:46.7 |
HIP 113180 |
8.65 |
| 2026-08-04 00:00 |
22:55:07.96 |
+09:35:49.4 |
HIP 113180 |
8.24 |
| 2026-08-04 12:00 |
22:54:57.46 |
+09:35:51.1 |
HIP 113180 |
8.60 |
| 2026-08-05 00:00 |
22:54:46.87 |
+09:35:51.8 |
HIP 113180 |
9.66 |
| 2026-08-05 12:00 |
22:54:36.18 |
+09:35:51.4 |
HIP 113180 |
11.25 |
| 2026-08-06 00:00 |
22:54:25.39 |
+09:35:50.1 |
HIP 113180 |
13.18 |
| 2026-08-06 12:00 |
22:54:14.51 |
+09:35:47.7 |
HIP 113180 |
15.34 |
| 2026-08-07 00:00 |
22:54:03.54 |
+09:35:44.2 |
HIP 113180 |
17.66 |
| 2026-08-07 12:00 |
22:53:52.48 |
+09:35:39.8 |
HIP 113180 |
20.09 |
| 2026-08-08 00:00 |
22:53:41.33 |
+09:35:34.3 |
HIP 113180 |
22.60 |
| 2026-08-08 12:00 |
22:53:30.09 |
+09:35:27.8 |
HIP 112935 |
21.96 |
| 2026-08-09 00:00 |
22:53:18.76 |
+09:35:20.2 |
HIP 112935 |
20.06 |
| 2026-08-09 12:00 |
22:53:07.35 |
+09:35:11.6 |
HIP 112935 |
18.40 |
| 2026-08-10 00:00 |
22:52:55.85 |
+09:35:02.0 |
HIP 112935 |
17.04 |
| 2026-08-10 12:00 |
22:52:44.27 |
+09:34:51.4 |
HIP 112935 |
16.09 |
| 2026-08-11 00:00 |
22:52:32.60 |
+09:34:39.7 |
HIP 112935 |
15.62 |
| 2026-08-11 12:00 |
22:52:20.85 |
+09:34:27.1 |
HIP 112935 |
15.70 |
| 2026-08-12 00:00 |
22:52:09.03 |
+09:34:13.4 |
HIP 112935 |
16.32 |
| 2026-08-12 12:00 |
22:51:57.12 |
+09:33:58.6 |
HIP 112935 |
17.44 |
| 2026-08-13 00:00 |
22:51:45.14 |
+09:33:42.9 |
HIP 112935 |
18.98 |
| 2026-08-13 12:00 |
22:51:33.08 |
+09:33:26.1 |
HIP 112935 |
20.85 |
| 2026-08-14 00:00 |
22:51:20.95 |
+09:33:08.3 |
HIP 112935 |
22.99 |
| 2026-08-14 12:00 |
22:51:08.74 |
+09:32:49.5 |
HIP 112935 |
25.33 |
| 2026-08-15 00:00 |
22:50:56.47 |
+09:32:29.8 |
HIP 112935 |
27.82 |
| 2026-08-15 12:00 |
22:50:44.12 |
+09:32:08.9 |
HIP 112654 |
29.65 |
| 2026-08-16 00:00 |
22:50:31.71 |
+09:31:47.1 |
HIP 112654 |
26.73 |
| 2026-08-16 12:00 |
22:50:19.23 |
+09:31:24.3 |
HIP 112654 |
23.83 |
| 2026-08-17 00:00 |
22:50:06.68 |
+09:31:00.5 |
HIP 112654 |
20.97 |
| 2026-08-17 12:00 |
22:49:54.07 |
+09:30:35.8 |
HIP 112654 |
18.16 |
| 2026-08-18 00:00 |
22:49:41.40 |
+09:30:10.0 |
HIP 112654 |
15.47 |
| 2026-08-18 12:00 |
22:49:28.67 |
+09:29:43.2 |
HIP 112654 |
12.96 |
| 2026-08-19 00:00 |
22:49:15.88 |
+09:29:15.5 |
HIP 112654 |
10.79 |