| Parameter |
Value |
| Designation |
C/2014 F2 (Tenagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-01-02T07:05:02.428800Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:07Z |
| Obs used |
300 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-08-06.0000000 |
| e |
0.97089096 |
| q (au) |
4.314459 |
| a (au) |
148.217132 |
| i (deg) |
119.061202 |
| Ω (om, deg) |
267.449809 |
| ω (w, deg) |
86.041144 |
| M (ma, deg) |
359.918454 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.987 |
| n |
6.000 |
| gf |
0.988 |
| gb |
-0.593 |
| k |
0.800 |
| δ90 |
9.775 |
| 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 |
| 2013-06-19 |
2014-10-02 |
+8.8067 |
-5.851 |
| 2015-02-09 |
2015-12-10 |
-5.8148 |
+3.628 |
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 |
04:47:29.48 |
-10:05:39.3 |
HIP 22171 |
20.62 |
| 2026-07-29 12:00 |
04:47:32.03 |
-10:06:12.7 |
HIP 22171 |
21.01 |
| 2026-07-30 00:00 |
04:47:34.55 |
-10:06:46.3 |
HIP 22171 |
21.42 |
| 2026-07-30 12:00 |
04:47:37.03 |
-10:07:20.3 |
HIP 22171 |
21.84 |
| 2026-07-31 00:00 |
04:47:39.49 |
-10:07:54.4 |
HIP 22171 |
22.27 |
| 2026-07-31 12:00 |
04:47:41.92 |
-10:08:28.8 |
HIP 22171 |
22.72 |
| 2026-08-01 00:00 |
04:47:44.31 |
-10:09:03.5 |
HIP 22171 |
23.19 |
| 2026-08-01 12:00 |
04:47:46.67 |
-10:09:38.3 |
HIP 22171 |
23.66 |
| 2026-08-02 00:00 |
04:47:49.00 |
-10:10:13.5 |
HIP 22171 |
24.14 |
| 2026-08-02 12:00 |
04:47:51.30 |
-10:10:48.9 |
HIP 22171 |
24.64 |
| 2026-08-03 00:00 |
04:47:53.57 |
-10:11:24.5 |
HIP 22292 |
24.10 |
| 2026-08-03 12:00 |
04:47:55.80 |
-10:12:00.3 |
HIP 22292 |
23.46 |
| 2026-08-04 00:00 |
04:47:58.00 |
-10:12:36.4 |
HIP 22292 |
22.82 |
| 2026-08-04 12:00 |
04:48:00.17 |
-10:13:12.7 |
HIP 22292 |
22.20 |
| 2026-08-05 00:00 |
04:48:02.31 |
-10:13:49.3 |
HIP 22292 |
21.58 |
| 2026-08-05 12:00 |
04:48:04.41 |
-10:14:26.0 |
HIP 22292 |
20.97 |
| 2026-08-06 00:00 |
04:48:06.48 |
-10:15:03.1 |
HIP 22292 |
20.37 |
| 2026-08-06 12:00 |
04:48:08.51 |
-10:15:40.3 |
HIP 22292 |
19.77 |
| 2026-08-07 00:00 |
04:48:10.52 |
-10:16:17.8 |
HIP 22292 |
19.19 |
| 2026-08-07 12:00 |
04:48:12.48 |
-10:16:55.5 |
HIP 22292 |
18.62 |
| 2026-08-08 00:00 |
04:48:14.42 |
-10:17:33.4 |
HIP 22292 |
18.06 |
| 2026-08-08 12:00 |
04:48:16.32 |
-10:18:11.5 |
HIP 22292 |
17.52 |
| 2026-08-09 00:00 |
04:48:18.18 |
-10:18:49.9 |
HIP 22292 |
16.99 |
| 2026-08-09 12:00 |
04:48:20.01 |
-10:19:28.5 |
HIP 22292 |
16.47 |
| 2026-08-10 00:00 |
04:48:21.81 |
-10:20:07.3 |
HIP 22292 |
15.97 |
| 2026-08-10 12:00 |
04:48:23.57 |
-10:20:46.3 |
HIP 22292 |
15.48 |
| 2026-08-11 00:00 |
04:48:25.29 |
-10:21:25.5 |
HIP 22292 |
15.02 |
| 2026-08-11 12:00 |
04:48:26.98 |
-10:22:04.9 |
HIP 22292 |
14.57 |
| 2026-08-12 00:00 |
04:48:28.63 |
-10:22:44.6 |
HIP 22292 |
14.15 |
| 2026-08-12 12:00 |
04:48:30.25 |
-10:23:24.4 |
HIP 22292 |
13.75 |
| 2026-08-13 00:00 |
04:48:31.83 |
-10:24:04.5 |
HIP 22292 |
13.37 |
| 2026-08-13 12:00 |
04:48:33.38 |
-10:24:44.7 |
HIP 22292 |
13.02 |
| 2026-08-14 00:00 |
04:48:34.88 |
-10:25:25.2 |
HIP 22292 |
12.70 |
| 2026-08-14 12:00 |
04:48:36.36 |
-10:26:05.8 |
HIP 22292 |
12.41 |
| 2026-08-15 00:00 |
04:48:37.79 |
-10:26:46.6 |
HIP 22292 |
12.16 |
| 2026-08-15 12:00 |
04:48:39.19 |
-10:27:27.7 |
HIP 22292 |
11.94 |
| 2026-08-16 00:00 |
04:48:40.55 |
-10:28:08.9 |
HIP 22292 |
11.75 |
| 2026-08-16 12:00 |
04:48:41.87 |
-10:28:50.3 |
HIP 22292 |
11.61 |
| 2026-08-17 00:00 |
04:48:43.16 |
-10:29:31.9 |
HIP 22292 |
11.50 |
| 2026-08-17 12:00 |
04:48:44.40 |
-10:30:13.7 |
HIP 22292 |
11.43 |
| 2026-08-18 00:00 |
04:48:45.61 |
-10:30:55.7 |
HIP 22292 |
11.41 |
| 2026-08-18 12:00 |
04:48:46.79 |
-10:31:37.8 |
HIP 22292 |
11.42 |
| 2026-08-19 00:00 |
04:48:47.92 |
-10:32:20.1 |
HIP 22292 |
11.48 |