2008 - Minor Planet Photometry

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2008

Photometry

Obs Code

Name

Longitude

Latitude

Altitude

Time (UT)

E17

Leura

150d 20' 30"

-33d 42' 22"

950m

+10h

E19

Kingsgrove

151d 5' 45"

-33d 56' 51"

60m

+10h

Q68

BMO

150d 20' 30"

-33d 42' 22"

950m

+10h

Telescope

Mount

f/ratio

Focuser

Camera

Location

SCT 0.25m

G11 Gemini v2

5.2

none

ST402ME

E19

SCT 0.35m

Celestron CGE

7 (GEG)

robofocus

ST9 XME

E17

Light curves of asteroid periods found in 2008.  All period are light time corrected. The criteria for target selection in Kingsgrove observatory were mainly for its favourable opposition brightness and also its southerly location due to local restrictions to the  observatory‚Äôs northern horizon. Observing is useful for photometry in dark sky(moonless) to about 14.5magnitude. Leura observatory limiting magnitude is 17.5magnitude with precision of <0.03m.

Bracket next to Date Range indicate the location and system used. All period are light time corrected. An asterisk (*) after the name indicate published light curve in Minor Planet Bulletin.

PSABA: Photometric Survey of Asynchronous Binary Asteroids. CALL: Collaborative Asteroid Light curve Link


178 Belisana*
Date range: 31/08 - 22/09
Period: 12.3264h + 0.0008h
Amplitude: 0.22m + 0.02m
H=9.38: D=41.68: Albedo=0.180: Class=S
PA=17.9;LPAB=19.2:BPAB =-1.5
Second attempt for 178 Belisana on its 2008 apparition. This time observations will be by Frederick Pilcher  from Organ Mesa observatory USA along with another observer,Vladimir Benishek from Serbia. We will form a long baseline that will resolve the ambiguity that was found in the 2007 apparition published in MPB 35-3. 178 Belisana mean PAB in 2007 is 246.5. A difference of about 130 deg from 2008 apparition. If in 2007 the aspect is pole-on then the 2008 apparition  the asteroid is tilted at about 45 latitude. Which means that as observations progressed through opposition this year, amplitude will be reduced further and eventually the first harmonic will start to dominate showing only a monomodal lightcurve.
My data obtained on 31/08 and 01/09 was linked by using the same comparison stars on both nights. The current lightcurve is most likely be bimodal.  

315 Constantia*
Date range: 02/07 - 03/07(1)
Period: 5.345h + 0.003h
Amplitude: 0.60m + 0.02m
H = 13.20: D=7.18: Albedo = 0.180: Class=S;PA= 19.5
LPAB= 246 : BPAB=3

Target of opportunity in the same field as 2066 Palala. Previous period derived by Behrend et al.(2008) at 5.37h with U=2- with amplitude of 0.11m showing a monomodal light curve indicating a polar orientation. Current work showing a more favourable orientation showing a large amplitude bimodal lightcurve .

226 Weringia*
Date range: 06/11 - 22/12
Period: 11.149h + 0.002h
Amplitude: 0.15m + 0.02m
H = 9.70:D = 48.25: Albedo = 0.100: Class = SC
PA=10.4, 6.9, 10.9
Lpab=65 : Bpab=-18
Returning follow up target. Previous work Oey(2007) suggest a period of 11.240h +/- 0.002h

357 Ninina
Date (2007): 13/07 - 11/08
Period : 53.63h + 0.02h
Amplitude: 0.24m + 0.02m
Date (2008): 08/10 - 12/10
Period: insufficient data
Amplitude : insufficient data
H= 8.72: D=  99.5km: Albedo= 0.058: Class= C
PA(07) = 7, 1, 3
Lpab(07)= 310: Bpab= 3
PA(08)= 19
Lpab(08)=50: Bpab= -15
The low amplitude and unclear period obtained for the 6 hour session in 2008 shows no changes compare to the 2007 result. The lack of clear light curve shape and the availability of the new Canopus version 9.5.0.10 with the comp star selector module prompt me to reprocess the data. Once internally linked to the correct zero point, the analysis showing the period of 53.63h in contrast with the previously found period of 34.97h by Behrend et al. Further observation will be conducted to determine the correct period during the next apparition/opposition on the 27th Jan 2010.

552 Sigelinde*
Date range:11/04/08 - 03/05/08  (1)
Period: 17.156h + 0.002h
Amplitude: 0.18m + 0.03m
H=9.39: D=73km: Albedo=0.058: Class=C
PA=14.2 - 8.9
LPAB=240: BPAB= -5
CALL targets and the usual selection criteria.

677 Aaltje*
Date range: 15/07 - 29/08
Period: 16.6076h + 0.0006h
Amplitude: 0.30m + 0.02m
H=9.70: D= 63 : Albedo= 0.058: Class = C
PA= 15.9
LPAB= 339.8
BPAB= 8.4
Call target in 2007. Followed up work in 2008 apparition. The 2007 data was plagued with numerous background stars and the inevitable short sessions.
The 2008 data taken on 15/07 and 17/07 were linked using the same comparison stars. So does the data on 17/07 and that on 18/07. This confined the period to 16.7 and later confirmed with subsequent collection of data. The bimodal light curve formed fit well with a period of 16.6076h.

741 Botolphia
Date range: 30/05 - 31/05(1)
Period: 23.24h
Amplitude: 0.2m

  CALL target.  

788 Hohensteina*
Date range: 11/04/08 - 31/05/08(1)
Period : 37.176h + 0.004h
Amplitude: 0.18m + 0.03m
H = 8.3 : Dia= 120 : Albedo = 0.058 : Class = C
PA (2008): 8.2 - 12.8
LPAB(2008): 220
BPAB(2008): 12

CALL targets. Previous data shows a period of 11.16h+/-0.09h(Behrend et al.(2008)).
Work in collaboration with Dr. Michael Fauerbach. 3 nights of combined long run between US and Australia allow us to constrain the period to the one described here. Any further refinement of period has to be done in the next apparition perhaps with collaboration with even wider geographical location.
Indication of NPA rotation (Harris private correspondence).

929 Algunde*
Date range: 30/07 - 02/08
Period: 3.3110h + 0.0008h
Amplitude: 0.13m + 0.02m
H = 12.10: Dia = 11.91: Albedo = 0.180 : Class =S
PA: 15;LPAB = 340: BPAB =8.5

PSABA target. Second apparation.

1122 Neith*
Date range:31/08 - 29/09
Period: 12.599h + 0.006h
Amplitude: 0.08m + 0.02m
H=11.10:Dia=18.88: Albedo=0.180:Class=S
PA=18.2:LPAB = 6.7:BPAB=-6.1

CALL target
Since observations/project was completed for 788 Hohensteina, work has been done revolving around multiple sessions with common comparison stars ie internal linkages spanning multiple sessions. The criteria to start an observation of a target will be to begin around 1-2 months prior to opposition. During this time the asteroid is in the inflection path toward retrograde motion and it appear stationary for a few days. If the target turn out to be a slow rotator, the few continuous observing sessions can be linked and amplitude with the initial segment of the light curve can also be determined.
Session 883 consist of data from 31/08 and 01/09, session 898 consist of data from 10/09 and 11/09. Current observing run includes 178 Belisana, 2543 Machada, 4332 Milton

1449 Virtanen*
Date range: 30/05 - 08/07 (1)
Period: 30.495h + 0.005h
Amplitude: 0.60m + 0.02m
H = 12.4: Dia = 10.37: Albedo = 0.180 : Class =S
PA = 5.8 - 22.8:LPAB = 245.1 - 250.6
BPAB = 7.2 - 4.5

CALL target. Long period. Period constrained when multiple sessions were linked together due to target slow movement sharing common comparison stars.

1563 Noel*
Number of sessions:3
Date range: 03/04 - 05/04 (2)
Period: 3.5490h + 0.0008h
Amplitude: 0.15m + 0.02m
H=13.30:Dia=6.85: Albedo=0.180:Class=S:PA=4:
LPAB=198: BPAB=5
Data Points:167

Photometric Survey for Asynchronous Binary Asteroid target.  

1638 Ruanda*
Number of sessions: 5
Date range: 11/05 - 23/06 (1)
Period: 4.2397h + 0.0002h
Amplitude: 0.10m + 0.02m
H=11.50:D=21.06: Albedo=0.100:Class=SC:PA=11.2 - 0.2 - 9.9
LPAB=251 - 254
BPAB=0
Data Points: 247

Call target. No known period. Fit well into a trimodal curve. Initially shown to be a bimodal light curve of period 3.157h appear to be caused by significant error  from earlier poor quality data. This also caused the false detection of an event.

1785 Wurm*
Number of sessions: 2
Date range: 03/03 - 06/03 (2)
Period: 3.2696h + 0.0004h
Amplitude: 0.30m + 0.01m
H=13.2:D=7.18: Albedo=0.180: Class=S
PA=5: LPAB=171: BPAB=-5
Data Points:161

Photometric Survey for Asynchronous Binary Asteroid target.

1836 Komarov*
Date range: 11/07 - 15/07 (1)
Period: 8.081h + 0.002h
Amplitude: 0.39m + 0.02m
H = 11.30: Dia = 23.10 : Albedo = 0.100 : Class = SC
PA =3:LPAB = 287.7 :  BPAB = 2.5

CALL target.  

2193 Jackson*
Date range: 12/04 - 29/04 (1)
Period: 4.7541h + 0.0005h
Amplitude: 0.23m + 0.03m
H=10.30: D=48km: Albedo=0.058: Class=C:PA= 9.8 - 3.3
LPAB=226: BPAB= -1

CALL target. No previous known period. Observation finalised with U=3

2066 Palala*
Date range: 27/06 - 03/07(1)
Period: 9.730h + 0.002h
Amplitude: 0.65m + 0.03m
H=12.50: D=19km~: Albedo= 0.0491: Class=S
PA= 17.6-19.8:LPAB= 246: BPAB= 3.4

CALL target. No previous known period.


2478 Tokai
Date range: 27/06/08 - 21/07/08  (2)
Period: 25.88h + 0.01h
Amplitude(prim): 0.40m
Date range:26/01/07 - 05/02/07 (2)
H=12.8: D=8.63km: Albedo = 0.180: Class =S:PA = 9.7 - 3.8
LPAB = 293 : BPAB = 5

PSABA target. Synchronous binary follow up work.

2543 Machado
Period: 5.308h + 0.003h
Amplitude: 0.02m
H=11:Dia=34.82: Albedo=0.058: Class=C:PA=17.0
LPAB=8.1:BPAB=-13.2

Amplitude is very low at about 0.02m. Period is difficult to determine. Better precision data was obtained on 20-09-08 with a session length of 7.5h. While large spread still present(0.02m), it shows an amplitude of 0.02m with bimodal curve and if it was a polar aspect in 2007, the amplitude should be different and larger in 2008. Therefore with such persistent low amplitude a longer period light curve may be more likely. Further observations should be done to constrain the synodic period.

2777 Shuksin
Date range: 27/08- 28/08
Period: 3.87h + 0.02h
Amplitude: 0.05m + 0.03m
H = 13.10: Dia= 7.51: Albedo= 0.180: Class=S:PA=14.7
Lpab=6.6 :Bpab= -3.8

Target in the same field as 15268 1990 WF3. Only managed to cover the 2 nights. Period could either be the 3.88h or possibly long rotation period of more than 100h based on data supplied by R. Stephens. Other collaborators are S. Gajdos and  P. Kusnirak,  

3576 Galina*
Date range:01/10-08/10
Period: 5.910h + 0.003h
Amplitude: 0.04m + 0.01m
H=13.10:D=7.51: Albedo=0.180:Class=S
PA=3:LPAB=  9   BPAB=  -3    

PSABA target.

4182 Mount Locke*
Date range: 13/08 - 02/09
Period: 3.0175h + 0.0003h
Amplitude: 0.15m + 0.03m
H=12.20:D=15.26km: Albedo=0.100:Class=SC:PA= 5.0 - 9.2
LPAB=323 : BPAB=9.5

Target was suggested by Behrend as a suspect binary. attenuation noted at the end of session 868 is associated with poor atmospheric condition at an altitude of about 30deg. This color effect was later reprocessed and removed that eventually neutralise the light curve.

4332 Milton*
Date range: 31/08 - 11/09
Period: 3.2978h + 0.0003h
Amplitude: 0.30 + 0.05m
H=11.90: D=13.06km: Albedo=0.180: Class=S
PA=28 - 24
Lpab=18 - 21: Bpab= -10

CALL target. No specific aim accept that its part of observations with 178 Belisana.

5034 Joeharrington*
Date range:02/05 - 06/05(1)
Period: 8.417 + 0.004h
Amplitude:0.35m + 0.03m
H= 12.9: D= 8.24:     Albedo= 0.180: Class= S:PA=8
LPAB=233 : BPAB=-6.3

CALL target. No previous known period.

5315 Nunes*

Date range: 23/06 - 26/06(1)
Period: 2.798h + 0.003h
Amplitude: 0.24h + 0.03h
H = 12.9 : D= 8.24:Albedo = 0.180: Class = S
PA = 18 :  Lpab=247  Bpab= 4

CALL target. No previous known period

7609_1995_WX3

5481 Kiuchi
P_Orb =20.895h + 0.003h
P_1= 3.6199h + 0.0003h
Amplitude_1: 0.05 + 0.02mag
Data range: 13/03/07 - 05/04/07  (2)

Photometric Survey for Asynchronous Binary Asteroid target.  Its a confirmed binary.

5905 Johnson*

Date range: 28/08 - 30/08
Period: 3.487h + 0.003h
Amplitude: 0.10m + 0.03m
H= 13.2: Dia= 7.18: albedo= 0.180: Class=S:PA = 31
Lpab= 281 : Bpab=16

PSABA target. Asynchronous Binary asteroid follow up work.
Data published in MPB Volume 36 issue 3

7516 Kranj*
Number sessions: 17
Date range: 12/04 - 13/05 (2)
Period: 3.9676h + 0.0002h
Amplitude: 0.18h + 0.03h
H=13.20:Dia=7.18: Albedo=0.180:Class=S:PA=19.4 - 8.1
LPAB=233.9 - 237.7 BPAB=8.5 - 10.5
Data Points: 991

Photometric Survey for Asynchronous Binary Asteroid target. A suspect binary but no follow up  confirmation  even after numerous observations from Leura observatory and other observatories.

7965 Katsuhiko*
Date range: 28/06 - 08/07 (1)
Period: 5.3899h + 0.0004h
Amplitude: 0.40m + 0.02m
(+)H=12 : Dia = 21.02 : Albedo = 0.0634 : Class = S :PA=15.0 - 12.1
LPAB = 285 : BPAB = 19-16

Collaboration  with Greg Crawford and targets suggested by Colin Bembrick

8567 1996 HW1
Date range:01/10 - 09/10(1)
Period: 8.7546h + 0.0003h
Amplitude: 1.0m + 0.1m
H=15.30:Dia=2.73: Albedo=0.180:Class=S:PA=24
LPAB=21.1-26.5:      BPAB=-8.6-(-11.9)

Work in collaboration with Vladimir Benishek from Serbia.

13189 1997 AF13*
Date range: 21/06 - 26/06 (2)
Period: 5.9371h + 0.0006h
Amplitude: 1.1m + 0.1m
H = 14 : Dia = 4.96 : Albedo = 0.180 : Class = S :PA = 11.7
LPAB = 243 : BPAB = 7

PSABA target.

15268 1990 WF3
Date range: 24/09 - 09/10(2)
P1: 2.4225h + 0.0003h
Porb: 25.08h + 0.01h:H=14.2:Dia=4.53: Albedo=0.180
PA=4.7 - 6.0
LPAB=6.7   - 8.5                  BPAB =-2.8  - (-3.2)  

Photometric Survey of Asynchronous Binary Asteroid. Confirmed binary with orbital parameters as above.

15515 1999 VN80
Data range: 30/07 - 04/08
Period : 4.175h + 0.002h
Amplitude: 0.38m + 0.02m
H =13.90 : Dia = 9.16: Albedo = 0.058 : Class =C:PA = 17
LPAB = 57: BPAB=-3

Target in the same field while observing 929 Algunde. Data combined with those obtained by Jozef Vilagi from Modra observatory.

23046 1999 XN28
Date range:24/08 - 28/08
Period: 2.792h + 0.003h
Amplitude: 0.40m + 0.05m
H = 14.20: Dia=7.98: Albedo=0.058:Class=C:PA= 13
Lpab=7: Bpab=-3

Target of opportunity, in the same field as 15268 1990 WF3. Relatively faint at Instrumental magnitude of 18 with amplitude about 0.4m. Period derived as 2.792h . Collaborate with S.Gajdos from Modra

34155 2000 QJ22*
Date range: 25/10 - 08/12
Period: 3.0087h + 0.0002h
Amplitude: 0.10m + 0.03m
H = 13.30:Dia = 6.85: Albedo = 0.180 : Class = S:PA= 15 - 19
Lpab=  44 -50: Bpab=  -16

PSABA

35107 1991 VH
Date range: 15/12 - 14/01
P_1: 2.6238h + 0.0001h
Porb: 32.82h + 0.03h
H = 16.90: Dia = 1.31:  Albedo = 0.180 : Class = S:PA= 49.7 - 38.2 - 40
Lpab= 83 - 97
Bpab=-36 - (-13)

PSABA. Binary asteroid follow up observation on subsequent apparitions. Previous apparition were 1997 and 2003. Noted the low amplitude nature of the lightcurve suggesting pole-on orientation.

153591 2001 SN 263*

Date range: 13/03 - 31/03 (1)
Period: 3.4251h + 0.0002h
Amplitude: 0.10m + 0.05m
H = 16.32 : Dia = 1.71: Albedo = 0.180 : Class = S:PA =26.7 - 24.8
LPAB = 169 - 185.1
BPAB = -15.9 - (-16.3)

Photometric Survey for Asynchronous Binary Asteroid target

References:

~  http://ssd.jpl.nasa.gov/sbdb.cgi#top

+ http://ssd.jpl.nasa.gov/sbdb.cgi

 
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