| Parameter |
Value |
| Designation |
P/2014 X1 (Elenin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-01-07T17:47:02.883840Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:11Z |
| Obs used |
631 |
| NEO |
- |
| M1 |
15.500 |
| K1 |
6.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-02-01.0000000 |
| e |
0.71002560 |
| q (au) |
1.814883 |
| a (au) |
6.258771 |
| i (deg) |
25.971371 |
| Ω (om, deg) |
61.569126 |
| ω (w, deg) |
34.367902 |
| M (ma, deg) |
1.527015 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.535 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2014-09-04 |
2015-01-06 |
+19.0602 |
-4.445 |
| 2015-01-08 |
2016-03-15 |
+3.0066 |
-1.877 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
19:54:34.16 |
-44:41:24.1 |
HIP 98022 |
25.25 |
| 2026-09-25 12:00 |
19:54:29.87 |
-44:40:24.1 |
HIP 98022 |
26.42 |
| 2026-09-26 00:00 |
19:54:25.74 |
-44:39:23.5 |
HIP 98022 |
27.59 |
| 2026-09-26 12:00 |
19:54:21.78 |
-44:38:22.5 |
HIP 98022 |
28.77 |
| 2026-09-27 00:00 |
19:54:17.98 |
-44:37:20.9 |
HIP 98022 |
29.95 |
| 2026-09-27 12:00 |
19:54:14.34 |
-44:36:18.8 |
HIP 98022 |
31.14 |
| 2026-09-28 00:00 |
19:54:10.87 |
-44:35:16.3 |
HIP 97873 |
32.06 |
| 2026-09-28 12:00 |
19:54:07.56 |
-44:34:13.2 |
HIP 97873 |
32.91 |
| 2026-09-29 00:00 |
19:54:04.41 |
-44:33:09.7 |
HIP 97873 |
33.80 |
| 2026-09-29 12:00 |
19:54:01.44 |
-44:32:05.6 |
HIP 97693 |
33.22 |
| 2026-09-30 00:00 |
19:53:58.62 |
-44:31:01.1 |
HIP 97693 |
32.31 |
| 2026-09-30 12:00 |
19:53:55.97 |
-44:29:56.1 |
HIP 97693 |
31.43 |
| 2026-10-01 00:00 |
19:53:53.48 |
-44:28:50.7 |
HIP 97693 |
30.61 |
| 2026-10-01 12:00 |
19:53:51.16 |
-44:27:44.8 |
HIP 97693 |
29.83 |
| 2026-10-02 00:00 |
19:53:49.01 |
-44:26:38.5 |
HIP 97693 |
29.10 |
| 2026-10-02 12:00 |
19:53:47.02 |
-44:25:31.7 |
HIP 97693 |
28.43 |
| 2026-10-03 00:00 |
19:53:45.19 |
-44:24:24.5 |
HIP 97693 |
27.82 |
| 2026-10-03 12:00 |
19:53:43.53 |
-44:23:16.9 |
HIP 97693 |
27.27 |
| 2026-10-04 00:00 |
19:53:42.04 |
-44:22:08.8 |
HIP 97693 |
26.79 |
| 2026-10-04 12:00 |
19:53:40.71 |
-44:21:00.4 |
HIP 97693 |
26.39 |
| 2026-10-05 00:00 |
19:53:39.54 |
-44:19:51.5 |
HIP 97693 |
26.05 |
| 2026-10-05 12:00 |
19:53:38.55 |
-44:18:42.2 |
HIP 98034 |
25.35 |
| 2026-10-06 00:00 |
19:53:37.71 |
-44:17:32.5 |
HIP 98034 |
24.65 |
| 2026-10-06 12:00 |
19:53:37.05 |
-44:16:22.5 |
HIP 98034 |
23.95 |
| 2026-10-07 00:00 |
19:53:36.54 |
-44:15:12.0 |
HIP 98034 |
23.27 |
| 2026-10-07 12:00 |
19:53:36.21 |
-44:14:01.2 |
HIP 98034 |
22.60 |
| 2026-10-08 00:00 |
19:53:36.04 |
-44:12:50.0 |
HIP 98034 |
21.95 |
| 2026-10-08 12:00 |
19:53:36.03 |
-44:11:38.4 |
HIP 98034 |
21.31 |
| 2026-10-09 00:00 |
19:53:36.19 |
-44:10:26.5 |
HIP 98034 |
20.70 |
| 2026-10-09 12:00 |
19:53:36.52 |
-44:09:14.3 |
HIP 98034 |
20.11 |
| 2026-10-10 00:00 |
19:53:37.01 |
-44:08:01.6 |
HIP 98034 |
19.54 |
| 2026-10-10 12:00 |
19:53:37.66 |
-44:06:48.7 |
HIP 98034 |
19.01 |
| 2026-10-11 00:00 |
19:53:38.48 |
-44:05:35.4 |
HIP 98034 |
18.51 |
| 2026-10-11 12:00 |
19:53:39.46 |
-44:04:21.8 |
HIP 98034 |
18.05 |
| 2026-10-12 00:00 |
19:53:40.61 |
-44:03:07.9 |
HIP 98034 |
17.63 |
| 2026-10-12 12:00 |
19:53:41.92 |
-44:01:53.7 |
HIP 98034 |
17.27 |
| 2026-10-13 00:00 |
19:53:43.39 |
-44:00:39.2 |
HIP 98034 |
16.96 |
| 2026-10-13 12:00 |
19:53:45.03 |
-43:59:24.3 |
HIP 97827 |
16.67 |
| 2026-10-14 00:00 |
19:53:46.83 |
-43:58:09.2 |
HIP 97827 |
15.95 |
| 2026-10-14 12:00 |
19:53:48.79 |
-43:56:53.8 |
HIP 97827 |
15.33 |
| 2026-10-15 00:00 |
19:53:50.91 |
-43:55:38.2 |
HIP 97827 |
14.81 |
| 2026-10-15 12:00 |
19:53:53.19 |
-43:54:22.2 |
HIP 97827 |
14.42 |
| 2026-10-16 00:00 |
19:53:55.64 |
-43:53:06.0 |
HIP 97827 |
14.17 |