메타데이터
| 항목 |
값 |
| Designation |
C/1972 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1972-03-27T16:49:37.511040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:19Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
9.000 |
| K1 |
6.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1972-04-24.0000000 |
| e |
0.99814080 |
| q (au) |
0.927218 |
| a (au) |
498.718434 |
| i (deg) |
123.692688 |
| Ω (om, deg) |
160.299080 |
| ω (w, deg) |
257.698891 |
| M (ma, deg) |
0.002416 |
밝기
산란 + 전체 선형
$$
M_a = (8.513 + 3.707\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
8.513 |
| n |
3.707 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
0.978 |
| δ90 |
2.272 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
08:31:33.69 |
+70:28:08.4 |
HIP 41808 |
33.34 |
| 2026-03-26 12:00 |
08:31:31.36 |
+70:27:55.2 |
HIP 41365 |
33.16 |
| 2026-03-27 00:00 |
08:31:29.07 |
+70:27:41.9 |
HIP 41365 |
32.87 |
| 2026-03-27 12:00 |
08:31:26.81 |
+70:27:28.4 |
HIP 41365 |
32.59 |
| 2026-03-28 00:00 |
08:31:24.58 |
+70:27:14.9 |
HIP 41365 |
32.30 |
| 2026-03-28 12:00 |
08:31:22.39 |
+70:27:01.3 |
HIP 41365 |
32.02 |
| 2026-03-29 00:00 |
08:31:20.23 |
+70:26:47.6 |
HIP 41365 |
31.74 |
| 2026-03-29 12:00 |
08:31:18.11 |
+70:26:33.7 |
HIP 41365 |
31.46 |
| 2026-03-30 00:00 |
08:31:16.03 |
+70:26:19.8 |
HIP 41365 |
31.18 |
| 2026-03-30 12:00 |
08:31:13.98 |
+70:26:05.8 |
HIP 41365 |
30.91 |
| 2026-03-31 00:00 |
08:31:11.96 |
+70:25:51.7 |
HIP 41365 |
30.63 |
| 2026-03-31 12:00 |
08:31:09.98 |
+70:25:37.5 |
HIP 41365 |
30.36 |
| 2026-04-01 00:00 |
08:31:08.03 |
+70:25:23.2 |
HIP 41365 |
30.09 |
| 2026-04-01 12:00 |
08:31:06.12 |
+70:25:08.9 |
HIP 41365 |
29.82 |
| 2026-04-02 00:00 |
08:31:04.25 |
+70:24:54.4 |
HIP 41365 |
29.55 |
| 2026-04-02 12:00 |
08:31:02.41 |
+70:24:39.9 |
HIP 41365 |
29.29 |
| 2026-04-03 00:00 |
08:31:00.61 |
+70:24:25.2 |
HIP 41365 |
29.02 |
| 2026-04-03 12:00 |
08:30:58.84 |
+70:24:10.5 |
HIP 41365 |
28.76 |
| 2026-04-04 00:00 |
08:30:57.11 |
+70:23:55.7 |
HIP 41365 |
28.50 |
| 2026-04-04 12:00 |
08:30:55.41 |
+70:23:40.9 |
HIP 41365 |
28.25 |
| 2026-04-05 00:00 |
08:30:53.75 |
+70:23:25.9 |
HIP 41365 |
27.99 |
| 2026-04-05 12:00 |
08:30:52.13 |
+70:23:10.9 |
HIP 41365 |
27.74 |
| 2026-04-06 00:00 |
08:30:50.54 |
+70:22:55.7 |
HIP 41365 |
27.49 |
| 2026-04-06 12:00 |
08:30:48.99 |
+70:22:40.6 |
HIP 41365 |
27.24 |
| 2026-04-07 00:00 |
08:30:47.47 |
+70:22:25.3 |
HIP 41365 |
27.00 |
| 2026-04-07 12:00 |
08:30:45.99 |
+70:22:09.9 |
HIP 41365 |
26.76 |
| 2026-04-08 00:00 |
08:30:44.55 |
+70:21:54.5 |
HIP 41365 |
26.52 |
| 2026-04-08 12:00 |
08:30:43.14 |
+70:21:39.0 |
HIP 41365 |
26.28 |
| 2026-04-09 00:00 |
08:30:41.77 |
+70:21:23.5 |
HIP 41365 |
26.05 |
| 2026-04-09 12:00 |
08:30:40.44 |
+70:21:07.8 |
HIP 41365 |
25.82 |
| 2026-04-10 00:00 |
08:30:39.15 |
+70:20:52.1 |
HIP 41365 |
25.59 |
| 2026-04-10 12:00 |
08:30:37.89 |
+70:20:36.4 |
HIP 41365 |
25.37 |
| 2026-04-11 00:00 |
08:30:36.66 |
+70:20:20.5 |
HIP 41365 |
25.15 |
| 2026-04-11 12:00 |
08:30:35.48 |
+70:20:04.6 |
HIP 41365 |
24.93 |
| 2026-04-12 00:00 |
08:30:34.33 |
+70:19:48.7 |
HIP 41365 |
24.71 |
| 2026-04-12 12:00 |
08:30:33.22 |
+70:19:32.6 |
HIP 41365 |
24.50 |
| 2026-04-13 00:00 |
08:30:32.15 |
+70:19:16.5 |
HIP 41365 |
24.30 |
| 2026-04-13 12:00 |
08:30:31.11 |
+70:19:00.4 |
HIP 41365 |
24.10 |
| 2026-04-14 00:00 |
08:30:30.11 |
+70:18:44.2 |
HIP 41365 |
23.90 |
| 2026-04-14 12:00 |
08:30:29.15 |
+70:18:27.9 |
HIP 41365 |
23.70 |
| 2026-04-15 00:00 |
08:30:28.22 |
+70:18:11.6 |
HIP 41365 |
23.51 |
| 2026-04-15 12:00 |
08:30:27.33 |
+70:17:55.2 |
HIP 41365 |
23.33 |
| 2026-04-16 00:00 |
08:30:26.48 |
+70:17:38.8 |
HIP 41365 |
23.14 |