| 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) |
| 2026-07-29 00:00 |
14:25:19.62 |
-16:43:51.9 |
HIP 70554 |
27.43 |
| 2026-07-29 12:00 |
14:25:19.59 |
-16:43:50.6 |
HIP 70554 |
27.41 |
| 2026-07-30 00:00 |
14:25:19.56 |
-16:43:49.4 |
HIP 70554 |
27.40 |
| 2026-07-30 12:00 |
14:25:19.55 |
-16:43:48.2 |
HIP 70554 |
27.38 |
| 2026-07-31 00:00 |
14:25:19.55 |
-16:43:47.1 |
HIP 70554 |
27.36 |
| 2026-07-31 12:00 |
14:25:19.56 |
-16:43:46.1 |
HIP 70554 |
27.35 |
| 2026-08-01 00:00 |
14:25:19.57 |
-16:43:45.1 |
HIP 70554 |
27.33 |
| 2026-08-01 12:00 |
14:25:19.60 |
-16:43:44.1 |
HIP 70554 |
27.31 |
| 2026-08-02 00:00 |
14:25:19.64 |
-16:43:43.2 |
HIP 70554 |
27.29 |
| 2026-08-02 12:00 |
14:25:19.69 |
-16:43:42.4 |
HIP 70554 |
27.28 |
| 2026-08-03 00:00 |
14:25:19.75 |
-16:43:41.6 |
HIP 70554 |
27.26 |
| 2026-08-03 12:00 |
14:25:19.82 |
-16:43:40.9 |
HIP 70554 |
27.24 |
| 2026-08-04 00:00 |
14:25:19.90 |
-16:43:40.2 |
HIP 70554 |
27.22 |
| 2026-08-04 12:00 |
14:25:19.99 |
-16:43:39.5 |
HIP 70554 |
27.21 |
| 2026-08-05 00:00 |
14:25:20.09 |
-16:43:38.9 |
HIP 70554 |
27.19 |
| 2026-08-05 12:00 |
14:25:20.21 |
-16:43:38.4 |
HIP 70554 |
27.17 |
| 2026-08-06 00:00 |
14:25:20.33 |
-16:43:37.9 |
HIP 70554 |
27.16 |
| 2026-08-06 12:00 |
14:25:20.46 |
-16:43:37.4 |
HIP 70554 |
27.14 |
| 2026-08-07 00:00 |
14:25:20.60 |
-16:43:37.0 |
HIP 70554 |
27.12 |
| 2026-08-07 12:00 |
14:25:20.76 |
-16:43:36.7 |
HIP 70554 |
27.10 |
| 2026-08-08 00:00 |
14:25:20.92 |
-16:43:36.4 |
HIP 70554 |
27.09 |
| 2026-08-08 12:00 |
14:25:21.09 |
-16:43:36.2 |
HIP 70554 |
27.07 |
| 2026-08-09 00:00 |
14:25:21.28 |
-16:43:36.0 |
HIP 70554 |
27.05 |
| 2026-08-09 12:00 |
14:25:21.47 |
-16:43:35.9 |
HIP 70554 |
27.04 |
| 2026-08-10 00:00 |
14:25:21.68 |
-16:43:35.8 |
HIP 70554 |
27.02 |
| 2026-08-10 12:00 |
14:25:21.89 |
-16:43:35.7 |
HIP 70554 |
27.00 |
| 2026-08-11 00:00 |
14:25:22.12 |
-16:43:35.8 |
HIP 70554 |
26.99 |
| 2026-08-11 12:00 |
14:25:22.35 |
-16:43:35.8 |
HIP 70554 |
26.97 |
| 2026-08-12 00:00 |
14:25:22.60 |
-16:43:35.9 |
HIP 70554 |
26.95 |
| 2026-08-12 12:00 |
14:25:22.85 |
-16:43:36.1 |
HIP 70554 |
26.94 |
| 2026-08-13 00:00 |
14:25:23.12 |
-16:43:36.3 |
HIP 70554 |
26.92 |
| 2026-08-13 12:00 |
14:25:23.40 |
-16:43:36.6 |
HIP 70554 |
26.90 |
| 2026-08-14 00:00 |
14:25:23.68 |
-16:43:36.9 |
HIP 70554 |
26.89 |
| 2026-08-14 12:00 |
14:25:23.98 |
-16:43:37.3 |
HIP 70554 |
26.87 |
| 2026-08-15 00:00 |
14:25:24.29 |
-16:43:37.8 |
HIP 70554 |
26.86 |
| 2026-08-15 12:00 |
14:25:24.61 |
-16:43:38.2 |
HIP 70554 |
26.84 |
| 2026-08-16 00:00 |
14:25:24.93 |
-16:43:38.8 |
HIP 70554 |
26.83 |
| 2026-08-16 12:00 |
14:25:25.27 |
-16:43:39.3 |
HIP 70554 |
26.82 |
| 2026-08-17 00:00 |
14:25:25.62 |
-16:43:40.0 |
HIP 70554 |
26.80 |
| 2026-08-17 12:00 |
14:25:25.98 |
-16:43:40.7 |
HIP 70554 |
26.79 |
| 2026-08-18 00:00 |
14:25:26.34 |
-16:43:41.4 |
HIP 70554 |
26.78 |
| 2026-08-18 12:00 |
14:25:26.72 |
-16:43:42.2 |
HIP 70554 |
26.76 |
| 2026-08-19 00:00 |
14:25:27.11 |
-16:43:43.0 |
HIP 70554 |
26.75 |