| Parameter |
Value |
| Designation |
C/1955 N1 (Bakharev-Macfarlane-Krienke) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1955-07-11T12:59:41.798400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
28 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1955-08-16.0000000 |
| e |
0.99424862 |
| q (au) |
1.427452 |
| a (au) |
248.192798 |
| i (deg) |
50.033957 |
| Ω (om, deg) |
303.466133 |
| ω (w, deg) |
13.216239 |
| M (ma, deg) |
0.008938 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.175 + 5.060\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.175 |
| n |
5.060 |
| gf |
0.800 |
| gb |
-0.724 |
| k |
1.000 |
| 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 |
| 1955-07-13 |
1955-09-13 |
+0.5509 |
-0.010 |
| 1955-09-13 |
1955-11-23 |
+6.3738 |
-2.002 |
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 |
08:21:22.73 |
+19:15:51.8 |
HIP 40836 |
22.27 |
| 2026-06-01 12:00 |
08:21:23.53 |
+19:15:48.9 |
HIP 40836 |
22.46 |
| 2026-06-02 00:00 |
08:21:24.34 |
+19:15:45.9 |
HIP 40836 |
22.65 |
| 2026-06-02 12:00 |
08:21:25.16 |
+19:15:43.0 |
HIP 40836 |
22.84 |
| 2026-06-03 00:00 |
08:21:25.98 |
+19:15:40.0 |
HIP 40836 |
23.04 |
| 2026-06-03 12:00 |
08:21:26.82 |
+19:15:37.0 |
HIP 40836 |
23.23 |
| 2026-06-04 00:00 |
08:21:27.66 |
+19:15:33.9 |
HIP 40836 |
23.43 |
| 2026-06-04 12:00 |
08:21:28.51 |
+19:15:30.8 |
HIP 40836 |
23.63 |
| 2026-06-05 00:00 |
08:21:29.37 |
+19:15:27.7 |
HIP 40836 |
23.83 |
| 2026-06-05 12:00 |
08:21:30.24 |
+19:15:24.6 |
HIP 40836 |
24.03 |
| 2026-06-06 00:00 |
08:21:31.12 |
+19:15:21.4 |
HIP 40836 |
24.24 |
| 2026-06-06 12:00 |
08:21:32.00 |
+19:15:18.2 |
HIP 40836 |
24.45 |
| 2026-06-07 00:00 |
08:21:32.89 |
+19:15:15.0 |
HIP 40836 |
24.66 |
| 2026-06-07 12:00 |
08:21:33.79 |
+19:15:11.8 |
HIP 40836 |
24.87 |
| 2026-06-08 00:00 |
08:21:34.70 |
+19:15:08.5 |
HIP 40836 |
25.09 |
| 2026-06-08 12:00 |
08:21:35.62 |
+19:15:05.2 |
HIP 40836 |
25.30 |
| 2026-06-09 00:00 |
08:21:36.54 |
+19:15:01.9 |
HIP 40836 |
25.52 |
| 2026-06-09 12:00 |
08:21:37.47 |
+19:14:58.5 |
HIP 40836 |
25.74 |
| 2026-06-10 00:00 |
08:21:38.41 |
+19:14:55.1 |
HIP 40836 |
25.96 |
| 2026-06-10 12:00 |
08:21:39.36 |
+19:14:51.7 |
HIP 40836 |
26.18 |
| 2026-06-11 00:00 |
08:21:40.31 |
+19:14:48.3 |
HIP 40836 |
26.41 |
| 2026-06-11 12:00 |
08:21:41.28 |
+19:14:44.8 |
HIP 40836 |
26.64 |
| 2026-06-12 00:00 |
08:21:42.25 |
+19:14:41.3 |
HIP 40836 |
26.87 |
| 2026-06-12 12:00 |
08:21:43.22 |
+19:14:37.8 |
HIP 40836 |
27.10 |
| 2026-06-13 00:00 |
08:21:44.21 |
+19:14:34.3 |
HIP 40836 |
27.33 |
| 2026-06-13 12:00 |
08:21:45.20 |
+19:14:30.7 |
HIP 40836 |
27.57 |
| 2026-06-14 00:00 |
08:21:46.20 |
+19:14:27.1 |
HIP 40836 |
27.80 |
| 2026-06-14 12:00 |
08:21:47.20 |
+19:14:23.5 |
HIP 40836 |
28.04 |
| 2026-06-15 00:00 |
08:21:48.22 |
+19:14:19.9 |
HIP 40836 |
28.28 |
| 2026-06-15 12:00 |
08:21:49.24 |
+19:14:16.2 |
HIP 40836 |
28.53 |
| 2026-06-16 00:00 |
08:21:50.26 |
+19:14:12.5 |
HIP 40836 |
28.77 |
| 2026-06-16 12:00 |
08:21:51.30 |
+19:14:08.8 |
HIP 40836 |
29.01 |
| 2026-06-17 00:00 |
08:21:52.34 |
+19:14:05.1 |
HIP 40836 |
29.26 |
| 2026-06-17 12:00 |
08:21:53.38 |
+19:14:01.3 |
HIP 40836 |
29.51 |
| 2026-06-18 00:00 |
08:21:54.44 |
+19:13:57.5 |
HIP 40836 |
29.76 |
| 2026-06-18 12:00 |
08:21:55.50 |
+19:13:53.7 |
HIP 40836 |
30.01 |
| 2026-06-19 00:00 |
08:21:56.56 |
+19:13:49.9 |
HIP 40836 |
30.27 |
| 2026-06-19 12:00 |
08:21:57.63 |
+19:13:46.1 |
HIP 40836 |
30.52 |
| 2026-06-20 00:00 |
08:21:58.71 |
+19:13:42.2 |
HIP 40836 |
30.78 |
| 2026-06-20 12:00 |
08:21:59.80 |
+19:13:38.3 |
HIP 40836 |
31.04 |
| 2026-06-21 00:00 |
08:22:00.89 |
+19:13:34.4 |
HIP 40836 |
31.30 |
| 2026-06-21 12:00 |
08:22:01.99 |
+19:13:30.5 |
HIP 40836 |
31.56 |
| 2026-06-22 00:00 |
08:22:03.09 |
+19:13:26.5 |
HIP 40836 |
31.82 |