| Parameter |
Value |
| Designation |
119P/Parker-Hartley |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-04-03T23:02:16.448640Z |
| Orbit solution date (soln_date, UTC) |
2024-09-01T19:42:26Z |
| Obs used |
3237 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-20.0000000 |
| e |
0.29594027 |
| q (au) |
3.023931 |
| a (au) |
4.294992 |
| i (deg) |
5.183509 |
| Ω (om, deg) |
243.678154 |
| ω (w, deg) |
181.859700 |
| M (ma, deg) |
55.701021 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.651 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.651 |
| n |
6.000 |
| gf |
0.801 |
| gb |
-0.500 |
| k |
0.964 |
| δ90 |
1.000 |
| 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 |
| 2021-05-28 |
2021-10-23 |
+0.9742 |
-0.715 |
| 2021-10-23 |
2024-05-06 |
-1.5544 |
+0.897 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
16:43:20.60 |
-16:47:48.0 |
HIP 81723 |
26.74 |
| 2026-05-12 12:00 |
16:43:04.03 |
-16:47:17.9 |
HIP 81723 |
23.19 |
| 2026-05-13 00:00 |
16:42:47.36 |
-16:46:47.7 |
HIP 81723 |
19.78 |
| 2026-05-13 12:00 |
16:42:30.59 |
-16:46:17.6 |
HIP 81723 |
16.62 |
| 2026-05-14 00:00 |
16:42:13.71 |
-16:45:47.5 |
HIP 81723 |
13.91 |
| 2026-05-14 12:00 |
16:41:56.74 |
-16:45:17.5 |
HIP 81723 |
11.99 |
| 2026-05-15 00:00 |
16:41:39.67 |
-16:44:47.5 |
HIP 81723 |
11.29 |
| 2026-05-15 12:00 |
16:41:22.51 |
-16:44:17.6 |
HIP 81723 |
12.04 |
| 2026-05-16 00:00 |
16:41:05.25 |
-16:43:47.7 |
HIP 81723 |
14.04 |
| 2026-05-16 12:00 |
16:40:47.91 |
-16:43:17.8 |
HIP 81723 |
16.86 |
| 2026-05-17 00:00 |
16:40:30.49 |
-16:42:48.1 |
HIP 81723 |
20.17 |
| 2026-05-17 12:00 |
16:40:12.98 |
-16:42:18.4 |
HIP 81723 |
23.78 |
| 2026-05-18 00:00 |
16:39:55.40 |
-16:41:48.7 |
HIP 81723 |
27.58 |
| 2026-05-18 12:00 |
16:39:37.74 |
-16:41:19.2 |
HIP 81409 |
30.43 |
| 2026-05-19 00:00 |
16:39:20.00 |
-16:40:49.7 |
HIP 81409 |
26.63 |
| 2026-05-19 12:00 |
16:39:02.20 |
-16:40:20.4 |
HIP 81409 |
22.97 |
| 2026-05-20 00:00 |
16:38:44.33 |
-16:39:51.1 |
HIP 81409 |
19.56 |
| 2026-05-20 12:00 |
16:38:26.39 |
-16:39:21.9 |
HIP 81409 |
16.55 |
| 2026-05-21 00:00 |
16:38:08.39 |
-16:38:52.8 |
HIP 81409 |
14.23 |
| 2026-05-21 12:00 |
16:37:50.34 |
-16:38:23.9 |
HIP 81409 |
12.98 |
| 2026-05-22 00:00 |
16:37:32.23 |
-16:37:55.1 |
HIP 81409 |
13.13 |
| 2026-05-22 12:00 |
16:37:14.07 |
-16:37:26.3 |
HIP 81409 |
14.64 |
| 2026-05-23 00:00 |
16:36:55.85 |
-16:36:57.8 |
HIP 81409 |
17.17 |
| 2026-05-23 12:00 |
16:36:37.60 |
-16:36:29.3 |
HIP 81409 |
20.34 |
| 2026-05-24 00:00 |
16:36:19.29 |
-16:36:01.0 |
HIP 81409 |
23.92 |
| 2026-05-24 12:00 |
16:36:00.95 |
-16:35:32.8 |
HIP 81220 |
21.68 |
| 2026-05-25 00:00 |
16:35:42.57 |
-16:35:04.8 |
HIP 81220 |
19.71 |
| 2026-05-25 12:00 |
16:35:24.15 |
-16:34:36.9 |
HIP 81220 |
18.60 |
| 2026-05-26 00:00 |
16:35:05.71 |
-16:34:09.2 |
HIP 81220 |
18.53 |
| 2026-05-26 12:00 |
16:34:47.23 |
-16:33:41.6 |
HIP 81220 |
19.51 |
| 2026-05-27 00:00 |
16:34:28.72 |
-16:33:14.2 |
HIP 81220 |
21.39 |
| 2026-05-27 12:00 |
16:34:10.20 |
-16:32:47.0 |
HIP 81220 |
23.98 |
| 2026-05-28 00:00 |
16:33:51.65 |
-16:32:19.9 |
HIP 81220 |
27.06 |
| 2026-05-28 12:00 |
16:33:33.08 |
-16:31:53.1 |
HIP 81220 |
30.49 |
| 2026-05-29 00:00 |
16:33:14.50 |
-16:31:26.4 |
HIP 80894 |
30.68 |
| 2026-05-29 12:00 |
16:32:55.90 |
-16:31:00.0 |
HIP 80894 |
26.40 |
| 2026-05-30 00:00 |
16:32:37.30 |
-16:30:33.6 |
HIP 80894 |
22.19 |
| 2026-05-30 12:00 |
16:32:18.69 |
-16:30:07.5 |
HIP 80894 |
18.10 |
| 2026-05-31 00:00 |
16:32:00.07 |
-16:29:41.7 |
HIP 80894 |
14.26 |
| 2026-05-31 12:00 |
16:31:41.46 |
-16:29:16.0 |
HIP 80894 |
10.90 |
| 2026-06-01 00:00 |
16:31:22.84 |
-16:28:50.6 |
HIP 80894 |
8.64 |
| 2026-06-01 12:00 |
16:31:04.23 |
-16:28:25.3 |
HIP 80894 |
8.40 |
| 2026-06-02 00:00 |
16:30:45.63 |
-16:28:00.3 |
HIP 80894 |
10.31 |