| Parameter |
Value |
| Designation |
C/1952 Q1 (Harrington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1953-01-05T10:10:01.139520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:10Z |
| Obs used |
5 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1952-11-27.0000000 |
| e |
0.99595292 |
| q (au) |
1.664987 |
| a (au) |
411.404751 |
| i (deg) |
59.116673 |
| Ω (om, deg) |
221.391261 |
| ω (w, deg) |
191.629595 |
| M (ma, deg) |
359.995344 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.130 + 3.003\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.130 |
| n |
3.003 |
| 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 |
| 1952-10-10 |
1952-12-20 |
+24.3360 |
-5.080 |
| 1953-01-05 |
1953-05-08 |
+0.2446 |
-1.035 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
14:26:28.21 |
-16:51:16.0 |
HIP 70795 |
32.59 |
| 2026-06-01 12:00 |
14:26:27.16 |
-16:51:10.2 |
HIP 70795 |
32.86 |
| 2026-06-02 00:00 |
14:26:26.12 |
-16:51:04.4 |
HIP 70795 |
33.12 |
| 2026-06-02 12:00 |
14:26:25.09 |
-16:50:58.7 |
HIP 70795 |
33.38 |
| 2026-06-03 00:00 |
14:26:24.06 |
-16:50:52.9 |
HIP 70554 |
33.55 |
| 2026-06-03 12:00 |
14:26:23.03 |
-16:50:47.2 |
HIP 70554 |
33.41 |
| 2026-06-04 00:00 |
14:26:22.02 |
-16:50:41.5 |
HIP 70554 |
33.27 |
| 2026-06-04 12:00 |
14:26:21.00 |
-16:50:35.9 |
HIP 70554 |
33.14 |
| 2026-06-05 00:00 |
14:26:20.00 |
-16:50:30.2 |
HIP 70554 |
33.01 |
| 2026-06-05 12:00 |
14:26:19.00 |
-16:50:24.6 |
HIP 70554 |
32.87 |
| 2026-06-06 00:00 |
14:26:18.00 |
-16:50:19.0 |
HIP 70554 |
32.75 |
| 2026-06-06 12:00 |
14:26:17.02 |
-16:50:13.5 |
HIP 70554 |
32.62 |
| 2026-06-07 00:00 |
14:26:16.04 |
-16:50:07.9 |
HIP 70554 |
32.49 |
| 2026-06-07 12:00 |
14:26:15.06 |
-16:50:02.4 |
HIP 70554 |
32.37 |
| 2026-06-08 00:00 |
14:26:14.09 |
-16:49:56.9 |
HIP 70554 |
32.25 |
| 2026-06-08 12:00 |
14:26:13.13 |
-16:49:51.5 |
HIP 70554 |
32.13 |
| 2026-06-09 00:00 |
14:26:12.18 |
-16:49:46.0 |
HIP 70554 |
32.02 |
| 2026-06-09 12:00 |
14:26:11.23 |
-16:49:40.6 |
HIP 70554 |
31.90 |
| 2026-06-10 00:00 |
14:26:10.29 |
-16:49:35.2 |
HIP 70554 |
31.79 |
| 2026-06-10 12:00 |
14:26:09.35 |
-16:49:29.9 |
HIP 70554 |
31.68 |
| 2026-06-11 00:00 |
14:26:08.43 |
-16:49:24.6 |
HIP 70554 |
31.57 |
| 2026-06-11 12:00 |
14:26:07.50 |
-16:49:19.3 |
HIP 70554 |
31.46 |
| 2026-06-12 00:00 |
14:26:06.59 |
-16:49:14.0 |
HIP 70554 |
31.36 |
| 2026-06-12 12:00 |
14:26:05.68 |
-16:49:08.8 |
HIP 70554 |
31.26 |
| 2026-06-13 00:00 |
14:26:04.79 |
-16:49:03.6 |
HIP 70554 |
31.16 |
| 2026-06-13 12:00 |
14:26:03.89 |
-16:48:58.4 |
HIP 70554 |
31.06 |
| 2026-06-14 00:00 |
14:26:03.01 |
-16:48:53.2 |
HIP 70554 |
30.97 |
| 2026-06-14 12:00 |
14:26:02.13 |
-16:48:48.1 |
HIP 70554 |
30.87 |
| 2026-06-15 00:00 |
14:26:01.26 |
-16:48:43.1 |
HIP 70554 |
30.78 |
| 2026-06-15 12:00 |
14:26:00.40 |
-16:48:38.0 |
HIP 70554 |
30.69 |
| 2026-06-16 00:00 |
14:25:59.55 |
-16:48:33.0 |
HIP 70554 |
30.60 |
| 2026-06-16 12:00 |
14:25:58.70 |
-16:48:28.0 |
HIP 70554 |
30.52 |
| 2026-06-17 00:00 |
14:25:57.86 |
-16:48:23.0 |
HIP 70554 |
30.43 |
| 2026-06-17 12:00 |
14:25:57.03 |
-16:48:18.1 |
HIP 70554 |
30.35 |
| 2026-06-18 00:00 |
14:25:56.21 |
-16:48:13.2 |
HIP 70554 |
30.27 |
| 2026-06-18 12:00 |
14:25:55.39 |
-16:48:08.4 |
HIP 70554 |
30.19 |
| 2026-06-19 00:00 |
14:25:54.58 |
-16:48:03.6 |
HIP 70554 |
30.11 |
| 2026-06-19 12:00 |
14:25:53.78 |
-16:47:58.8 |
HIP 70554 |
30.04 |
| 2026-06-20 00:00 |
14:25:52.99 |
-16:47:54.0 |
HIP 70554 |
29.96 |
| 2026-06-20 12:00 |
14:25:52.21 |
-16:47:49.3 |
HIP 70554 |
29.89 |
| 2026-06-21 00:00 |
14:25:51.44 |
-16:47:44.6 |
HIP 70554 |
29.82 |
| 2026-06-21 12:00 |
14:25:50.67 |
-16:47:40.0 |
HIP 70554 |
29.75 |
| 2026-06-22 00:00 |
14:25:49.91 |
-16:47:35.4 |
HIP 70554 |
29.69 |