메타데이터
| 항목 |
값 |
| Designation |
C/1995 Q1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1995-08-31T10:02:38.832000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:47Z |
| Obs used |
156 |
| NEO |
- |
| M1 |
9.600 |
| K1 |
16.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1995-10-23.0000000 |
| e |
0.99802567 |
| q (au) |
0.436387 |
| a (au) |
221.030541 |
| i (deg) |
147.394301 |
| Ω (om, deg) |
178.054729 |
| ω (w, deg) |
331.161810 |
| M (ma, deg) |
0.015771 |
밝기
산란 + 전체 선형
$$
M_a = (7.436 + 4.304\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.436 |
| n |
4.304 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.000 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 1995-08-18 |
1995-08-30 |
-1.3532 |
+0.497 |
| 1995-09-23 |
1995-10-08 |
-3.7552 |
-0.310 |
| 1995-10-08 |
1995-10-17 |
+7.6437 |
-0.177 |
| 1995-10-17 |
1995-11-21 |
+1.5080 |
-0.252 |
| 1995-11-21 |
1995-12-13 |
+13.9429 |
-3.253 |
| 1995-12-13 |
1996-02-19 |
+6.5452 |
-1.275 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:32:39.98 |
+30:50:33.5 |
HIP 7123 |
17.38 |
| 2026-07-29 12:00 |
01:32:39.48 |
+30:50:42.4 |
HIP 7123 |
17.43 |
| 2026-07-30 00:00 |
01:32:38.97 |
+30:50:51.3 |
HIP 7123 |
17.47 |
| 2026-07-30 12:00 |
01:32:38.43 |
+30:51:00.0 |
HIP 7123 |
17.51 |
| 2026-07-31 00:00 |
01:32:37.88 |
+30:51:08.7 |
HIP 7123 |
17.54 |
| 2026-07-31 12:00 |
01:32:37.30 |
+30:51:17.2 |
HIP 7123 |
17.58 |
| 2026-08-01 00:00 |
01:32:36.70 |
+30:51:25.6 |
HIP 7123 |
17.61 |
| 2026-08-01 12:00 |
01:32:36.09 |
+30:51:33.9 |
HIP 7123 |
17.64 |
| 2026-08-02 00:00 |
01:32:35.46 |
+30:51:42.1 |
HIP 7123 |
17.66 |
| 2026-08-02 12:00 |
01:32:34.80 |
+30:51:50.2 |
HIP 7123 |
17.69 |
| 2026-08-03 00:00 |
01:32:34.13 |
+30:51:58.1 |
HIP 7123 |
17.71 |
| 2026-08-03 12:00 |
01:32:33.43 |
+30:52:06.0 |
HIP 7123 |
17.74 |
| 2026-08-04 00:00 |
01:32:32.72 |
+30:52:13.7 |
HIP 7123 |
17.76 |
| 2026-08-04 12:00 |
01:32:31.99 |
+30:52:21.3 |
HIP 7123 |
17.77 |
| 2026-08-05 00:00 |
01:32:31.24 |
+30:52:28.8 |
HIP 7123 |
17.79 |
| 2026-08-05 12:00 |
01:32:30.47 |
+30:52:36.1 |
HIP 7123 |
17.81 |
| 2026-08-06 00:00 |
01:32:29.68 |
+30:52:43.4 |
HIP 7123 |
17.82 |
| 2026-08-06 12:00 |
01:32:28.87 |
+30:52:50.5 |
HIP 7123 |
17.83 |
| 2026-08-07 00:00 |
01:32:28.04 |
+30:52:57.5 |
HIP 7123 |
17.84 |
| 2026-08-07 12:00 |
01:32:27.19 |
+30:53:04.4 |
HIP 7123 |
17.85 |
| 2026-08-08 00:00 |
01:32:26.32 |
+30:53:11.2 |
HIP 7123 |
17.86 |
| 2026-08-08 12:00 |
01:32:25.43 |
+30:53:17.8 |
HIP 7123 |
17.87 |
| 2026-08-09 00:00 |
01:32:24.53 |
+30:53:24.3 |
HIP 7123 |
17.88 |
| 2026-08-09 12:00 |
01:32:23.60 |
+30:53:30.7 |
HIP 7123 |
17.88 |
| 2026-08-10 00:00 |
01:32:22.66 |
+30:53:37.0 |
HIP 7123 |
17.89 |
| 2026-08-10 12:00 |
01:32:21.69 |
+30:53:43.1 |
HIP 7123 |
17.89 |
| 2026-08-11 00:00 |
01:32:20.71 |
+30:53:49.2 |
HIP 7123 |
17.89 |
| 2026-08-11 12:00 |
01:32:19.71 |
+30:53:55.0 |
HIP 7123 |
17.90 |
| 2026-08-12 00:00 |
01:32:18.69 |
+30:54:00.8 |
HIP 7123 |
17.90 |
| 2026-08-12 12:00 |
01:32:17.65 |
+30:54:06.4 |
HIP 7123 |
17.90 |
| 2026-08-13 00:00 |
01:32:16.59 |
+30:54:11.9 |
HIP 7123 |
17.90 |
| 2026-08-13 12:00 |
01:32:15.51 |
+30:54:17.3 |
HIP 7123 |
17.91 |
| 2026-08-14 00:00 |
01:32:14.41 |
+30:54:22.6 |
HIP 7123 |
17.91 |
| 2026-08-14 12:00 |
01:32:13.30 |
+30:54:27.7 |
HIP 7123 |
17.91 |
| 2026-08-15 00:00 |
01:32:12.17 |
+30:54:32.6 |
HIP 7123 |
17.91 |
| 2026-08-15 12:00 |
01:32:11.01 |
+30:54:37.5 |
HIP 7123 |
17.92 |
| 2026-08-16 00:00 |
01:32:09.84 |
+30:54:42.2 |
HIP 7123 |
17.92 |
| 2026-08-16 12:00 |
01:32:08.66 |
+30:54:46.8 |
HIP 7123 |
17.92 |
| 2026-08-17 00:00 |
01:32:07.45 |
+30:54:51.3 |
HIP 7123 |
17.93 |
| 2026-08-17 12:00 |
01:32:06.23 |
+30:54:55.6 |
HIP 7123 |
17.94 |
| 2026-08-18 00:00 |
01:32:04.98 |
+30:54:59.8 |
HIP 7123 |
17.94 |
| 2026-08-18 12:00 |
01:32:03.72 |
+30:55:03.8 |
HIP 7123 |
17.95 |
| 2026-08-19 00:00 |
01:32:02.45 |
+30:55:07.7 |
HIP 7123 |
17.96 |