메타데이터
| 항목 |
값 |
| Designation |
C/1985 R1 (Hartley-Good) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1985-12-09T02:47:23.835840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:33Z |
| Obs used |
165 |
| NEO |
- |
| M1 |
8.500 |
| K1 |
17.750 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
1985-11-02.0000000 |
| e |
0.99988722 |
| q (au) |
0.694581 |
| a (au) |
6158.910454 |
| i (deg) |
79.929544 |
| Ω (om, deg) |
358.395879 |
| ω (w, deg) |
87.032512 |
| M (ma, deg) |
359.999924 |
밝기
산란 + 전체 선형
$$
M_a = (7.908 + 3.182\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
7.908 |
| n |
3.182 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
| 1985-08-21 |
1985-09-21 |
-14.0412 |
+3.752 |
| 1985-09-21 |
1985-10-03 |
+7.8539 |
-1.023 |
| 1985-10-03 |
1985-12-08 |
-0.5890 |
-0.025 |
| 1985-12-09 |
1986-03-19 |
+13.0977 |
+1.300 |
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 |
09:12:21.71 |
-68:52:30.8 |
HIP 45315 |
9.92 |
| 2026-07-29 12:00 |
09:12:26.29 |
-68:52:27.5 |
HIP 45315 |
9.53 |
| 2026-07-30 00:00 |
09:12:30.87 |
-68:52:24.5 |
HIP 45315 |
9.15 |
| 2026-07-30 12:00 |
09:12:35.46 |
-68:52:21.7 |
HIP 45315 |
8.77 |
| 2026-07-31 00:00 |
09:12:40.06 |
-68:52:19.0 |
HIP 45315 |
8.39 |
| 2026-07-31 12:00 |
09:12:44.66 |
-68:52:16.6 |
HIP 45315 |
8.02 |
| 2026-08-01 00:00 |
09:12:49.26 |
-68:52:14.5 |
HIP 45315 |
7.64 |
| 2026-08-01 12:00 |
09:12:53.87 |
-68:52:12.5 |
HIP 45315 |
7.27 |
| 2026-08-02 00:00 |
09:12:58.48 |
-68:52:10.7 |
HIP 45315 |
6.90 |
| 2026-08-02 12:00 |
09:13:03.10 |
-68:52:09.2 |
HIP 45315 |
6.54 |
| 2026-08-03 00:00 |
09:13:07.72 |
-68:52:07.9 |
HIP 45315 |
6.18 |
| 2026-08-03 12:00 |
09:13:12.34 |
-68:52:06.8 |
HIP 45315 |
5.83 |
| 2026-08-04 00:00 |
09:13:16.96 |
-68:52:05.9 |
HIP 45315 |
5.48 |
| 2026-08-04 12:00 |
09:13:21.59 |
-68:52:05.2 |
HIP 45315 |
5.14 |
| 2026-08-05 00:00 |
09:13:26.22 |
-68:52:04.7 |
HIP 45315 |
4.81 |
| 2026-08-05 12:00 |
09:13:30.86 |
-68:52:04.5 |
HIP 45315 |
4.49 |
| 2026-08-06 00:00 |
09:13:35.49 |
-68:52:04.5 |
HIP 45315 |
4.19 |
| 2026-08-06 12:00 |
09:13:40.13 |
-68:52:04.6 |
HIP 45315 |
3.90 |
| 2026-08-07 00:00 |
09:13:44.77 |
-68:52:05.0 |
HIP 45315 |
3.64 |
| 2026-08-07 12:00 |
09:13:49.40 |
-68:52:05.7 |
HIP 45315 |
3.41 |
| 2026-08-08 00:00 |
09:13:54.04 |
-68:52:06.5 |
HIP 45315 |
3.20 |
| 2026-08-08 12:00 |
09:13:58.68 |
-68:52:07.6 |
HIP 45315 |
3.05 |
| 2026-08-09 00:00 |
09:14:03.32 |
-68:52:08.8 |
HIP 45315 |
2.93 |
| 2026-08-09 12:00 |
09:14:07.96 |
-68:52:10.3 |
HIP 45315 |
2.88 |
| 2026-08-10 00:00 |
09:14:12.60 |
-68:52:12.0 |
HIP 45315 |
2.87 |
| 2026-08-10 12:00 |
09:14:17.24 |
-68:52:14.0 |
HIP 45315 |
2.93 |
| 2026-08-11 00:00 |
09:14:21.88 |
-68:52:16.1 |
HIP 45315 |
3.04 |
| 2026-08-11 12:00 |
09:14:26.51 |
-68:52:18.5 |
HIP 45315 |
3.20 |
| 2026-08-12 00:00 |
09:14:31.15 |
-68:52:21.1 |
HIP 45315 |
3.40 |
| 2026-08-12 12:00 |
09:14:35.78 |
-68:52:23.9 |
HIP 45315 |
3.63 |
| 2026-08-13 00:00 |
09:14:40.41 |
-68:52:26.9 |
HIP 45315 |
3.89 |
| 2026-08-13 12:00 |
09:14:45.03 |
-68:52:30.1 |
HIP 45315 |
4.18 |
| 2026-08-14 00:00 |
09:14:49.66 |
-68:52:33.6 |
HIP 45315 |
4.48 |
| 2026-08-14 12:00 |
09:14:54.28 |
-68:52:37.2 |
HIP 45315 |
4.80 |
| 2026-08-15 00:00 |
09:14:58.89 |
-68:52:41.1 |
HIP 45315 |
5.14 |
| 2026-08-15 12:00 |
09:15:03.50 |
-68:52:45.2 |
HIP 45315 |
5.48 |
| 2026-08-16 00:00 |
09:15:08.11 |
-68:52:49.5 |
HIP 45315 |
5.83 |
| 2026-08-16 12:00 |
09:15:12.71 |
-68:52:54.1 |
HIP 45315 |
6.19 |
| 2026-08-17 00:00 |
09:15:17.31 |
-68:52:58.8 |
HIP 45315 |
6.55 |
| 2026-08-17 12:00 |
09:15:21.91 |
-68:53:03.8 |
HIP 45315 |
6.92 |
| 2026-08-18 00:00 |
09:15:26.49 |
-68:53:08.9 |
HIP 45315 |
7.29 |
| 2026-08-18 12:00 |
09:15:31.07 |
-68:53:14.3 |
HIP 45315 |
7.67 |
| 2026-08-19 00:00 |
09:15:35.65 |
-68:53:19.9 |
HIP 45315 |
8.05 |