| 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
$$
M_a = (6.988 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.988 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-0.593 |
| k |
0.800 |
| δ90 |
9.999 |
| 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 |
-5.8147 |
+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) |
| 2026-03-26 00:00 |
04:32:19.91 |
-10:15:08.3 |
HIP 21025 |
33.76 |
| 2026-03-26 12:00 |
04:32:21.72 |
-10:14:37.3 |
HIP 21025 |
33.81 |
| 2026-03-27 00:00 |
04:32:23.57 |
-10:14:06.3 |
HIP 21025 |
33.89 |
| 2026-03-27 12:00 |
04:32:25.45 |
-10:13:35.5 |
HIP 21025 |
33.98 |
| 2026-03-28 00:00 |
04:32:27.37 |
-10:13:04.8 |
HIP 21025 |
34.10 |
| 2026-03-28 12:00 |
04:32:29.32 |
-10:12:34.1 |
HIP 21025 |
34.25 |
| 2026-03-29 00:00 |
04:32:31.31 |
-10:12:03.6 |
HIP 21025 |
34.41 |
| 2026-03-29 12:00 |
04:32:33.33 |
-10:11:33.2 |
HIP 21025 |
34.60 |
| 2026-03-30 00:00 |
04:32:35.39 |
-10:11:02.9 |
HIP 21025 |
34.81 |
| 2026-03-30 12:00 |
04:32:37.49 |
-10:10:32.7 |
HIP 21025 |
35.04 |
| 2026-03-31 00:00 |
04:32:39.62 |
-10:10:02.7 |
HIP 21025 |
35.29 |
| 2026-03-31 12:00 |
04:32:41.78 |
-10:09:32.7 |
HIP 21025 |
35.56 |
| 2026-04-01 00:00 |
04:32:43.98 |
-10:09:02.9 |
HIP 21025 |
35.86 |
| 2026-04-01 12:00 |
04:32:46.21 |
-10:08:33.2 |
HIP 21025 |
36.17 |
| 2026-04-02 00:00 |
04:32:48.47 |
-10:08:03.6 |
HIP 21025 |
36.51 |
| 2026-04-02 12:00 |
04:32:50.77 |
-10:07:34.1 |
HIP 21025 |
36.87 |
| 2026-04-03 00:00 |
04:32:53.10 |
-10:07:04.8 |
HIP 21025 |
37.25 |
| 2026-04-03 12:00 |
04:32:55.46 |
-10:06:35.6 |
HIP 21025 |
37.64 |
| 2026-04-04 00:00 |
04:32:57.86 |
-10:06:06.6 |
HIP 21025 |
38.06 |
| 2026-04-04 12:00 |
04:33:00.29 |
-10:05:37.6 |
HIP 21025 |
38.50 |
| 2026-04-05 00:00 |
04:33:02.75 |
-10:05:08.8 |
HIP 21375 |
38.35 |
| 2026-04-05 12:00 |
04:33:05.25 |
-10:04:40.2 |
HIP 21375 |
37.58 |
| 2026-04-06 00:00 |
04:33:07.78 |
-10:04:11.7 |
HIP 21375 |
36.80 |
| 2026-04-06 12:00 |
04:33:10.33 |
-10:03:43.3 |
HIP 21375 |
36.01 |
| 2026-04-07 00:00 |
04:33:12.92 |
-10:03:15.1 |
HIP 21375 |
35.22 |
| 2026-04-07 12:00 |
04:33:15.55 |
-10:02:47.1 |
HIP 21375 |
34.42 |
| 2026-04-08 00:00 |
04:33:18.20 |
-10:02:19.1 |
HIP 21375 |
33.62 |
| 2026-04-08 12:00 |
04:33:20.88 |
-10:01:51.4 |
HIP 21375 |
32.82 |
| 2026-04-09 00:00 |
04:33:23.60 |
-10:01:23.8 |
HIP 21375 |
32.01 |
| 2026-04-09 12:00 |
04:33:26.34 |
-10:00:56.3 |
HIP 21375 |
31.19 |
| 2026-04-10 00:00 |
04:33:29.12 |
-10:00:29.0 |
HIP 21375 |
30.37 |
| 2026-04-10 12:00 |
04:33:31.92 |
-10:00:01.9 |
HIP 21375 |
29.55 |
| 2026-04-11 00:00 |
04:33:34.76 |
-09:59:35.0 |
HIP 21375 |
28.72 |
| 2026-04-11 12:00 |
04:33:37.62 |
-09:59:08.2 |
HIP 21375 |
27.88 |
| 2026-04-12 00:00 |
04:33:40.52 |
-09:58:41.6 |
HIP 21375 |
27.04 |
| 2026-04-12 12:00 |
04:33:43.44 |
-09:58:15.1 |
HIP 21375 |
26.20 |
| 2026-04-13 00:00 |
04:33:46.39 |
-09:57:48.8 |
HIP 21375 |
25.35 |
| 2026-04-13 12:00 |
04:33:49.37 |
-09:57:22.7 |
HIP 21375 |
24.50 |
| 2026-04-14 00:00 |
04:33:52.38 |
-09:56:56.8 |
HIP 21375 |
23.64 |
| 2026-04-14 12:00 |
04:33:55.42 |
-09:56:31.1 |
HIP 21375 |
22.78 |
| 2026-04-15 00:00 |
04:33:58.48 |
-09:56:05.5 |
HIP 21375 |
21.91 |
| 2026-04-15 12:00 |
04:34:01.57 |
-09:55:40.2 |
HIP 21375 |
21.04 |
| 2026-04-16 00:00 |
04:34:04.69 |
-09:55:15.0 |
HIP 21375 |
20.17 |